The purpose of this experiment was to investigate the effect and mechanism of quercetin on reproductive performance in perinatal sows.According to the similar principle of parity and body weight,24 perinatal sows were...The purpose of this experiment was to investigate the effect and mechanism of quercetin on reproductive performance in perinatal sows.According to the similar principle of parity and body weight,24 perinatal sows were randomly divided into four treatments with six replicates,including normal control and three treatments fed by a basal diet supplemented with 0,0.025%,0.050%,and 0.075%quercetin,respectively.The feeding trial was conducted from 100 days of gestation to 28 days post-partum.Reproductive performance,colostrum composition,serum indexes of antioxidation,inflammation,hormones,and the diversity and relative abundance of fecal microflora were determined in perinatal sows.Compared with the control,quercetin significantly reduced the rate of constipation,serum content of malondialdehyde(MDA),prolactin(PRL),and progesterone(PROG),and significantly increased the content of serum estradiol(E2)and insulin-like growth factor-1(IGF-1)in colostrum of perinatal sows(P<0.05).Meanwhile,0.025%quercetin significantly increased glutathione(GSH)content in serum(P<0.05),0.050%quercetin significantly reduced the rate of backfat loss(P<0.05),and 0.075%quercetin significantly increased immunoglobulin M(IgM)content in colostrum of perinatal sows(P<0.05).In addition,0.050%and 0.075%quercetin significantly shortened estrus interval(P<0.05)and significantly increased the content of IgA and IgG in colostrum(P<0.05)and dopamine(DA)content in serum of perinatal sows(P<0.05).Quercetin significantly decreased the content of nitric oxide(NO),IL-1β,IL-6,TNF-α,and MCP-1 in serum(P<0.05)and significantly improved microflora abundance and diversity in feces of perinatal sows(P<0.05).In conclusion,dietary supplementation of quercetin reduced oxidative stress and inflammatory responses and regulated intestinal microflora in perinatal sows,thus improved reproductive performance in perinatal sows.Under this experimental condition,the optimal supplementation with dietary quercetin was 0.075%in perinatal sows.展开更多
An experiment was conducted to determine the concentration variation of epidermal growth factors(EGF), include insulin-like growth factor -Ⅰ(IGF-Ⅰ), transforming growth factor-beta(TGF-Ⅰ ), and basic fibroblast gr-...An experiment was conducted to determine the concentration variation of epidermal growth factors(EGF), include insulin-like growth factor -Ⅰ(IGF-Ⅰ), transforming growth factor-beta(TGF-Ⅰ ), and basic fibroblast gr-owth factor (bFGF) in colostrum and normal milk of sows within 35 days after parturition. The results showed that the concentration of EGF, IGF-Ⅰ, TGF-β, bFGF was significantly higher in colostrum than that in normal milk. The concentration of these growth factors in colostrum was significantly decreased with the stage lapse of lactation, and then they remained stable in normal milk. Parity had a slight effect on the concentration of these growth factors.展开更多
Three breeds of sows were observed to investigate the relationship between Single Nucleotide Polymorphisms（SNPs） in Mu Opioid Receptor（MOR）and stereotypic behaviour,such as,sham-chewing,bar biting and standing sti...Three breeds of sows were observed to investigate the relationship between Single Nucleotide Polymorphisms（SNPs） in Mu Opioid Receptor（MOR）and stereotypic behaviour,such as,sham-chewing,bar biting and standing still in order to better understand the mechanism of stereotypic development of the animals in restrained conditions.MOR exon 2 partial sequences were amplified to analyze single nucleotide polymorphisms by PCR-SSCP.One SNP,a silence mutant was found.A significant difference （P〈0.01）was found in the frequency of genotypes in these 3 breeds where only the BB genotype,which was identical to that published in GenBank,was found in the Duroc breed,while no AA genotype was found in Landrace,3 genotypes AA,BB and AB were found in Yorkshire.The result also indicated that the individuals with AA and AB genotypes tended to be more active in sham-chewing than those with the BB genotype（P〈0.05）.The overall results of this study suggested that sham-chewing of sows may be subjected to both genetic control and environmental conditions,but activity level was more likely to be affected by their environment.We can putatively draw the conclusion that MOR gene has effect on the sham-chewing behavioral traits of sow.展开更多
A simple preparation using the ear tissue for PCR amplification was established for diagnosis of genotypes for halothane in 181 sows.3 halothane heterozygous pigs were detected.The behaviors of the sows that have diff...A simple preparation using the ear tissue for PCR amplification was established for diagnosis of genotypes for halothane in 181 sows.3 halothane heterozygous pigs were detected.The behaviors of the sows that have different genotypes were observed.The heterozygous sows expressed seem more behavioral stereotypies than halothane resistant.But there is no difference in two genotypes.The behaviour directed trough in heterozygous sows is higher than halothane resistant.展开更多
Human depression patients often show abnormal pupillary reflex with morphological changes in hippo campus and prefrontal cortex. This study aimed to find the relationship between the prolonged pupillary light reflex ...Human depression patients often show abnormal pupillary reflex with morphological changes in hippo campus and prefrontal cortex. This study aimed to find the relationship between the prolonged pupillary light reflex （PLR） which had been shown by confined sows with chronic stress or depression and morphological changes in brain, in order to provide theoretical basis for that the confined environment should lead to sows＇ depression. A total of 637 sows of Durac, Landrace and Large White breeds with various parities were observed, and the pupil light reflex （PLR） was measured and the actual pupillary light reflex time （PLRT） were recorded. All the PLRTs were grouped based on the results of confidence interval： t〉10% as group A, 5% 〈t〈10% as group B, 1%〈t〈5% as group C and t〈l% as group D. Three individuals were randomly selected from each group （12 sows in total） and the white tissues of hippocampus and the prefrontal cortex were prepared for HS staining slices （three slices/per tissue） for observation on tissue structure and pathological changes with high magnification （400X） of electronic microscope. The results showed that in group A （t〉10%） pathological change was found in hippocampus, however, as PLRT increased from group B to group D, pathological changes in hippocampus tissues tended to be deteriorated with the increase of inflammatory cells and nuclear pyknosis phenomena. The same as those shown in hippocampus as the increasing of PLRT from groups A to D, more inflammatory cells appeared in prefrontal cortex for groups B and D. The results suggested that the tissue lesions of hippocampus and prefrontal cortex of the confined sows with prolonged PLRT might be the results of chronic stress or depression.展开更多
Two experiments were carried out to study the grunting of sows during nursing and the sucking behaviour of piglets. In experimental Ⅰ,six Yorkshire sows and their litters were observed and managed in farrowing crate...Two experiments were carried out to study the grunting of sows during nursing and the sucking behaviour of piglets. In experimental Ⅰ,six Yorkshire sows and their litters were observed and managed in farrowing crates.In experimental Ⅱ,six Harbin White sows and their litters were selected and housed in farrowing pens.The behaviours and activities of the sows during nursing and the activities of piglets during sucking were recorded with a portable video camera(Panasonic NV-VX22EN) The results showed that the characteristic patterns of grunting by the sows consist of an initial period of rhythmic grunting at a fairly constant rate and followed by a period of more rapid grunting,and then a decline in grunting rate toward the completion of nursing.The pattern of vocalization showed by the mothers bears a reliable synchronization to the sucking behaviour of the piglets.The rate of grunting varied little during jostling for teat and nosing the udder.The beginning of slow sucking usually occurred during or just after the increase in grunt rate.The rapid sucking began 15～25 seconds after the period of most rapid grunting,following the decrease of grunt rate.afterwards the nursing ended.There were individualities found in sows'grunting patterns. It is found that vocalizations attracted the piglets to the sows and synchronized sucking activities of piglets,but the results indicated that the premassaging time and numbers of piglets engaging massaging influenced the grunting pattern and the onset of the milk ejection.As more piglets were involved the massaging,the higher the grunting rate peak,the faster the milk ejection.展开更多
Background:Today,stress moderators are employed to mitigate crop loss due to the adverse effects of environmental stress.The current research aimed to investigate the impacts of time and stress moderator types on agro...Background:Today,stress moderators are employed to mitigate crop loss due to the adverse effects of environmental stress.The current research aimed to investigate the impacts of time and stress moderator types on agro-physiological responses of cotton on conventional and double-cropping systems during 2017 and 2018 under saline conditions.A split-plot factorial experiment was carried out in a randomized complete block design with three replications.Cultivation system[conventional(recommended planting date)and double-cropping systems(sowing after harvest of wheat)]were considered as the main plots,and stress moderator type at four levels[water control,2 mmol·L^(-1) Salicylic acid(SA),100 mmol·L^(-1) Glycine betaine(GB),and 100μmol·L^(-1) sodium nitroprusside(SNP)]and application time(flowering and flowering+bolling stages)were regarded as subplots.Results:Plant height,reproductive branch number,the number of bolls,10-boll weight,1000-seed weight,biological yield,seed cotton yield,lint yield,chlorophyll a,chlorophyll b,carotenoids,total chlorophyll,sodium,potassium,and proline content were less in double-cropping system comparing with conventional system.Spraying with the stress moderators alleviated soil salinity effects on yield,yield components,and biochemical traits of cotton.SNP spraying led to maximum plant height,branch number,the number of bolls per plant,10-boll weight and seed cotton yield.SA spraying yielded the highest 1000-seed weight,biological yield,lint percentage and lint yield.The highest chlorophyll a,chlorophyll b,carotenoids,and total chlorophyll content resulted from SNP spraying.Yield,yield components,and biochemical traits did not respond to the stress moderator types in double-cropping system.However,the highest chlorophyll a,carotenoids,proline content,the number of bolls per plant,and seed cotton yield resulted from SNP spraying in conventional system.No statistically significant differences were observed between spraying with SNP and SA in most studied traits.Conclusions:The results suggest that the optimum cotton planting time and SNP spraying could be recommended for producing the most suitable yield under saline conditions.Highlights:External application of stress modulators increases salinity stress tolerance.Spraying with sodium nitroprusside has more moderating effect.Agro-physiological response of cotton to moderators is stronger in early sowing.Maximum seed cotton yield was achieved at early sowing and spraying sodium nitroprusside.Delayed cultivation reduces cotton yield.展开更多
To study the effect of soil water and salt environment factors on the root growth of cotton under different moisture control,three different emergence water volumes(60,105,and 150 m^(3)/hm^(2)),two different frequenci...To study the effect of soil water and salt environment factors on the root growth of cotton under different moisture control,three different emergence water volumes(60,105,and 150 m^(3)/hm^(2)),two different frequencies(high frequency and low frequency)and one double film cover winter irrigation control treatment(CK:2250 m^(3)/hm^(2))were set up to analyze the spatial distribution patterns of soil water and salt environment and root density in dry sown and wet emerged cotton fields under diffe-rent moisture control conditions.The results show that the soil water content and water infiltration range gradually become larger with the increase of seedling water quantity,and the larger the seedling water quantity,the higher the soil water content.With the same seedling water quantity,the soil water content of the high-frequency(HF)treatment becomes obviously larger.The soil conductivity of each treatment tends to decrease gradually with the increase of seedling water and drip frequency,among which the distribution of soil conductivity of S6 treatment is closest to that of CK.With the increase in soil depth,the soil conductivity tends to increase first and then decrease.Compared with the low-frequency(LF)treatment,the high-frequency treatment shows a significantly deeper soil salt accumulation layer.The root length density(RLD)of cotton gradually increases with the amount of seedling water and the frequency of dripping.The soil layer of root distribution gradually deepens with the amount of seedling water in the vertical direction,and the RLD value in the horizontal direction is significantly greater in the mulched area than that in the bare area between films.This research can serve as a solid scientific foundation for the use of dry sowing and wet emergence techniques in cotton fields in southern Xinjiang.展开更多
In order to reduce the driving fatigue in sowing work, this paper based on heart rate （HR） as the main indicator to survey, tested and analyzed the fatigue condition of the drivers of three imported tractors and one...In order to reduce the driving fatigue in sowing work, this paper based on heart rate （HR） as the main indicator to survey, tested and analyzed the fatigue condition of the drivers of three imported tractors and one domestic tractor in sowing work. The results showed that when driving the imported tractors in sowing work, the HR increasing rate was 10.4%-14.3%, labor intensity belonged to the light level; when driving domestic tractor in sowing work, the HR increasing rate was 23.4%-33.0%, it was remarkably bigger than that of driving imported tractors （P〈0.05）, labor intensity belonged to the middle level. The main effects on driving fatigue included the control methods, tractors＇ cab environment, processing time, operating content, and so on. Finally, we proposed the concrete measures and suggestions to reduce driving fatigue and improve drivers＇ work condition.展开更多
Qiyechangbai and Hadacongl were used to study the relationship of the leaf age of overwinter to bolting and, returning green by the difference of sowing time. The results showed that the earlier the seeds were sown, t...Qiyechangbai and Hadacongl were used to study the relationship of the leaf age of overwinter to bolting and, returning green by the difference of sowing time. The results showed that the earlier the seeds were sown, the older leaf age of overwinter was, the higher the rates of returning green and bolting rate were, the earlier the bolting time was. The leaf age of overwinter of Qiyechangbai sown August 31 to September 14 was 2.1-3.1 leaves and the rate of returning green was 86.5%-92.1%, while the leaf age of overwinter of Hadacongl sown September 7 to September 14 was 2.3-2.7 leaves and the rate of returning green was 88.5%-93.8%, both varieties didn＇t bolt. In addition, in the same sowing time, the bolting rate of Hadacong I was higher than that of Qiyechangbai slightly.展开更多
Local climate conditions and sowing time are very important to the vernalization and summer reproduction of the wheat. Xundian County is located in Yunnan Province of China, at latitude 25.56° north and longitude...Local climate conditions and sowing time are very important to the vernalization and summer reproduction of the wheat. Xundian County is located in Yunnan Province of China, at latitude 25.56° north and longitude 103.25° east. Xundian County is situated 1 873 m above sea level, and is conducive for the summer reproduction of the wheat. To investigate the optimal sowing time, 11 spring wheat cultivars and one semi-winter wheat cultivar were sown 10 times at an interval of fi ve days from May 26, 2012, and the strong winter wheat Suyin 10 was treated in a vernalization room at 2℃ with different concentrations of the gibberellin and 5-azacytidine. The results showed that Suyin 10 should be vernalized at 2℃ for 30 days in summer, and the growth periods of strong winter wheat plants could been shortened if treated with a specifi c concentration of the gibberellin and 5-azacytidine at a low temperature. The growth period of the spring wheat in summer reproduction was delayed, and their agronomic traits gradually decreased with the passage of the sowing time. Thus, spring wheat should be sown at the earliest time possible for better yield. June 25 should be the latest date for summer reproduction of the wheat, but the semi-winter wheat cultivars in Xundian County should be added generation in summer after being treated at 2℃ for 10 days. Xundian County is a suitable location for summer reproduction of the wheat in China.展开更多
In order to determine the most suitable sowing periods for maize in the cold area of Harbin City,the field test method was adopted.From 2018 to 2019,the main maize variety Xianyu 696 which was planted in Harbin City,H...In order to determine the most suitable sowing periods for maize in the cold area of Harbin City,the field test method was adopted.From 2018 to 2019,the main maize variety Xianyu 696 which was planted in Harbin City,Heilongjiang Province,was used as the test material for the six-sowing-period treatment experiments.The sowing period settings were as the followings:April 20(T1),April 24(T2),April 27(T3),May 4(T4),May 11(T5)and May 18(T6).In the experiment,the effects of different sowing periods on the growth and development,yields and quality of maize were studied.The results showed that the maize through T1 treatment had the longest growth period,the lowest height and the highest ear height,and the highest grain protein content.The maize through T6 treatment had the highest height and ear height,as well as the highest starch and oil content.And the grain crude fat,soluble protein,soluble sugar and the moisture content increased and then decreased with the delay of the sowing period.The maize through T4 treatment had the highest content of soluble protein.However,other quality indicators and the number of rows,the length of the bald tip,the number of grains per spike and the weight of 100 grains first increased and then decreased with the delay of the sowing period.The dry matter accumulation through T4 treatment was significantly higher than the ones through five treatments,and the 100-kernel weight and other ear-grain traits were the highest,the maizes through T4 treatment increased the yield by 21.54%compared with that through T1 treatment.Thus,the most suitable sowing period for the maize in the cold area of Harbin City was from May 4 to May 11.It provided technical supports for guiding maize planting in the cold area of Harbin City.展开更多
基金Supported by the National Natural Science Foundation of China(32072749)。
文摘The purpose of this experiment was to investigate the effect and mechanism of quercetin on reproductive performance in perinatal sows.According to the similar principle of parity and body weight,24 perinatal sows were randomly divided into four treatments with six replicates,including normal control and three treatments fed by a basal diet supplemented with 0,0.025%,0.050%,and 0.075%quercetin,respectively.The feeding trial was conducted from 100 days of gestation to 28 days post-partum.Reproductive performance,colostrum composition,serum indexes of antioxidation,inflammation,hormones,and the diversity and relative abundance of fecal microflora were determined in perinatal sows.Compared with the control,quercetin significantly reduced the rate of constipation,serum content of malondialdehyde(MDA),prolactin(PRL),and progesterone(PROG),and significantly increased the content of serum estradiol(E2)and insulin-like growth factor-1(IGF-1)in colostrum of perinatal sows(P<0.05).Meanwhile,0.025%quercetin significantly increased glutathione(GSH)content in serum(P<0.05),0.050%quercetin significantly reduced the rate of backfat loss(P<0.05),and 0.075%quercetin significantly increased immunoglobulin M(IgM)content in colostrum of perinatal sows(P<0.05).In addition,0.050%and 0.075%quercetin significantly shortened estrus interval(P<0.05)and significantly increased the content of IgA and IgG in colostrum(P<0.05)and dopamine(DA)content in serum of perinatal sows(P<0.05).Quercetin significantly decreased the content of nitric oxide(NO),IL-1β,IL-6,TNF-α,and MCP-1 in serum(P<0.05)and significantly improved microflora abundance and diversity in feces of perinatal sows(P<0.05).In conclusion,dietary supplementation of quercetin reduced oxidative stress and inflammatory responses and regulated intestinal microflora in perinatal sows,thus improved reproductive performance in perinatal sows.Under this experimental condition,the optimal supplementation with dietary quercetin was 0.075%in perinatal sows.
文摘An experiment was conducted to determine the concentration variation of epidermal growth factors(EGF), include insulin-like growth factor -Ⅰ(IGF-Ⅰ), transforming growth factor-beta(TGF-Ⅰ ), and basic fibroblast gr-owth factor (bFGF) in colostrum and normal milk of sows within 35 days after parturition. The results showed that the concentration of EGF, IGF-Ⅰ, TGF-β, bFGF was significantly higher in colostrum than that in normal milk. The concentration of these growth factors in colostrum was significantly decreased with the stage lapse of lactation, and then they remained stable in normal milk. Parity had a slight effect on the concentration of these growth factors.
基金Supported by National Natural Sciences Foundation of China(39970533)
文摘Three breeds of sows were observed to investigate the relationship between Single Nucleotide Polymorphisms（SNPs） in Mu Opioid Receptor（MOR）and stereotypic behaviour,such as,sham-chewing,bar biting and standing still in order to better understand the mechanism of stereotypic development of the animals in restrained conditions.MOR exon 2 partial sequences were amplified to analyze single nucleotide polymorphisms by PCR-SSCP.One SNP,a silence mutant was found.A significant difference （P〈0.01）was found in the frequency of genotypes in these 3 breeds where only the BB genotype,which was identical to that published in GenBank,was found in the Duroc breed,while no AA genotype was found in Landrace,3 genotypes AA,BB and AB were found in Yorkshire.The result also indicated that the individuals with AA and AB genotypes tended to be more active in sham-chewing than those with the BB genotype（P〈0.05）.The overall results of this study suggested that sham-chewing of sows may be subjected to both genetic control and environmental conditions,but activity level was more likely to be affected by their environment.We can putatively draw the conclusion that MOR gene has effect on the sham-chewing behavioral traits of sow.
文摘A simple preparation using the ear tissue for PCR amplification was established for diagnosis of genotypes for halothane in 181 sows.3 halothane heterozygous pigs were detected.The behaviors of the sows that have different genotypes were observed.The heterozygous sows expressed seem more behavioral stereotypies than halothane resistant.But there is no difference in two genotypes.The behaviour directed trough in heterozygous sows is higher than halothane resistant.
基金Supported by the National Natural Science Foundation of China(NSFC,31472131/C170109,31201834/C170109)Scientific Research Foundation for Doctorship of Northeast Agricultural University(2010RCB37)
文摘Human depression patients often show abnormal pupillary reflex with morphological changes in hippo campus and prefrontal cortex. This study aimed to find the relationship between the prolonged pupillary light reflex （PLR） which had been shown by confined sows with chronic stress or depression and morphological changes in brain, in order to provide theoretical basis for that the confined environment should lead to sows＇ depression. A total of 637 sows of Durac, Landrace and Large White breeds with various parities were observed, and the pupil light reflex （PLR） was measured and the actual pupillary light reflex time （PLRT） were recorded. All the PLRTs were grouped based on the results of confidence interval： t〉10% as group A, 5% 〈t〈10% as group B, 1%〈t〈5% as group C and t〈l% as group D. Three individuals were randomly selected from each group （12 sows in total） and the white tissues of hippocampus and the prefrontal cortex were prepared for HS staining slices （three slices/per tissue） for observation on tissue structure and pathological changes with high magnification （400X） of electronic microscope. The results showed that in group A （t〉10%） pathological change was found in hippocampus, however, as PLRT increased from group B to group D, pathological changes in hippocampus tissues tended to be deteriorated with the increase of inflammatory cells and nuclear pyknosis phenomena. The same as those shown in hippocampus as the increasing of PLRT from groups A to D, more inflammatory cells appeared in prefrontal cortex for groups B and D. The results suggested that the tissue lesions of hippocampus and prefrontal cortex of the confined sows with prolonged PLRT might be the results of chronic stress or depression.
文摘Two experiments were carried out to study the grunting of sows during nursing and the sucking behaviour of piglets. In experimental Ⅰ,six Yorkshire sows and their litters were observed and managed in farrowing crates.In experimental Ⅱ,six Harbin White sows and their litters were selected and housed in farrowing pens.The behaviours and activities of the sows during nursing and the activities of piglets during sucking were recorded with a portable video camera(Panasonic NV-VX22EN) The results showed that the characteristic patterns of grunting by the sows consist of an initial period of rhythmic grunting at a fairly constant rate and followed by a period of more rapid grunting,and then a decline in grunting rate toward the completion of nursing.The pattern of vocalization showed by the mothers bears a reliable synchronization to the sucking behaviour of the piglets.The rate of grunting varied little during jostling for teat and nosing the udder.The beginning of slow sucking usually occurred during or just after the increase in grunt rate.The rapid sucking began 15～25 seconds after the period of most rapid grunting,following the decrease of grunt rate.afterwards the nursing ended.There were individualities found in sows'grunting patterns. It is found that vocalizations attracted the piglets to the sows and synchronized sucking activities of piglets,but the results indicated that the premassaging time and numbers of piglets engaging massaging influenced the grunting pattern and the onset of the milk ejection.As more piglets were involved the massaging,the higher the grunting rate peak,the faster the milk ejection.
文摘Background:Today,stress moderators are employed to mitigate crop loss due to the adverse effects of environmental stress.The current research aimed to investigate the impacts of time and stress moderator types on agro-physiological responses of cotton on conventional and double-cropping systems during 2017 and 2018 under saline conditions.A split-plot factorial experiment was carried out in a randomized complete block design with three replications.Cultivation system[conventional(recommended planting date)and double-cropping systems(sowing after harvest of wheat)]were considered as the main plots,and stress moderator type at four levels[water control,2 mmol·L^(-1) Salicylic acid(SA),100 mmol·L^(-1) Glycine betaine(GB),and 100μmol·L^(-1) sodium nitroprusside(SNP)]and application time(flowering and flowering+bolling stages)were regarded as subplots.Results:Plant height,reproductive branch number,the number of bolls,10-boll weight,1000-seed weight,biological yield,seed cotton yield,lint yield,chlorophyll a,chlorophyll b,carotenoids,total chlorophyll,sodium,potassium,and proline content were less in double-cropping system comparing with conventional system.Spraying with the stress moderators alleviated soil salinity effects on yield,yield components,and biochemical traits of cotton.SNP spraying led to maximum plant height,branch number,the number of bolls per plant,10-boll weight and seed cotton yield.SA spraying yielded the highest 1000-seed weight,biological yield,lint percentage and lint yield.The highest chlorophyll a,chlorophyll b,carotenoids,and total chlorophyll content resulted from SNP spraying.Yield,yield components,and biochemical traits did not respond to the stress moderator types in double-cropping system.However,the highest chlorophyll a,carotenoids,proline content,the number of bolls per plant,and seed cotton yield resulted from SNP spraying in conventional system.No statistically significant differences were observed between spraying with SNP and SA in most studied traits.Conclusions:The results suggest that the optimum cotton planting time and SNP spraying could be recommended for producing the most suitable yield under saline conditions.Highlights:External application of stress modulators increases salinity stress tolerance.Spraying with sodium nitroprusside has more moderating effect.Agro-physiological response of cotton to moderators is stronger in early sowing.Maximum seed cotton yield was achieved at early sowing and spraying sodium nitroprusside.Delayed cultivation reduces cotton yield.
基金National Key Research and Development Plan(2021YFD1900805)Funded Project of Basic Scientific Research Business of Public Welfare Research Institutes in Autonomous Region(KY2022127)。
文摘To study the effect of soil water and salt environment factors on the root growth of cotton under different moisture control,three different emergence water volumes(60,105,and 150 m^(3)/hm^(2)),two different frequencies(high frequency and low frequency)and one double film cover winter irrigation control treatment(CK:2250 m^(3)/hm^(2))were set up to analyze the spatial distribution patterns of soil water and salt environment and root density in dry sown and wet emerged cotton fields under diffe-rent moisture control conditions.The results show that the soil water content and water infiltration range gradually become larger with the increase of seedling water quantity,and the larger the seedling water quantity,the higher the soil water content.With the same seedling water quantity,the soil water content of the high-frequency(HF)treatment becomes obviously larger.The soil conductivity of each treatment tends to decrease gradually with the increase of seedling water and drip frequency,among which the distribution of soil conductivity of S6 treatment is closest to that of CK.With the increase in soil depth,the soil conductivity tends to increase first and then decrease.Compared with the low-frequency(LF)treatment,the high-frequency treatment shows a significantly deeper soil salt accumulation layer.The root length density(RLD)of cotton gradually increases with the amount of seedling water and the frequency of dripping.The soil layer of root distribution gradually deepens with the amount of seedling water in the vertical direction,and the RLD value in the horizontal direction is significantly greater in the mulched area than that in the bare area between films.This research can serve as a solid scientific foundation for the use of dry sowing and wet emergence techniques in cotton fields in southern Xinjiang.
基金"211" Talent Start-up Fund Project of Northeast Agricultural University (183)
文摘In order to reduce the driving fatigue in sowing work, this paper based on heart rate （HR） as the main indicator to survey, tested and analyzed the fatigue condition of the drivers of three imported tractors and one domestic tractor in sowing work. The results showed that when driving the imported tractors in sowing work, the HR increasing rate was 10.4%-14.3%, labor intensity belonged to the light level; when driving domestic tractor in sowing work, the HR increasing rate was 23.4%-33.0%, it was remarkably bigger than that of driving imported tractors （P〈0.05）, labor intensity belonged to the middle level. The main effects on driving fatigue included the control methods, tractors＇ cab environment, processing time, operating content, and so on. Finally, we proposed the concrete measures and suggestions to reduce driving fatigue and improve drivers＇ work condition.
基金Supported by Science and Technology Innovation Fund of Undergraduation of Northeast Agricultural University(20060201)
文摘Qiyechangbai and Hadacongl were used to study the relationship of the leaf age of overwinter to bolting and, returning green by the difference of sowing time. The results showed that the earlier the seeds were sown, the older leaf age of overwinter was, the higher the rates of returning green and bolting rate were, the earlier the bolting time was. The leaf age of overwinter of Qiyechangbai sown August 31 to September 14 was 2.1-3.1 leaves and the rate of returning green was 86.5%-92.1%, while the leaf age of overwinter of Hadacongl sown September 7 to September 14 was 2.3-2.7 leaves and the rate of returning green was 88.5%-93.8%, both varieties didn＇t bolt. In addition, in the same sowing time, the bolting rate of Hadacong I was higher than that of Qiyechangbai slightly.
基金the National Natural Science Foundation of China(31000712)
文摘Local climate conditions and sowing time are very important to the vernalization and summer reproduction of the wheat. Xundian County is located in Yunnan Province of China, at latitude 25.56° north and longitude 103.25° east. Xundian County is situated 1 873 m above sea level, and is conducive for the summer reproduction of the wheat. To investigate the optimal sowing time, 11 spring wheat cultivars and one semi-winter wheat cultivar were sown 10 times at an interval of fi ve days from May 26, 2012, and the strong winter wheat Suyin 10 was treated in a vernalization room at 2℃ with different concentrations of the gibberellin and 5-azacytidine. The results showed that Suyin 10 should be vernalized at 2℃ for 30 days in summer, and the growth periods of strong winter wheat plants could been shortened if treated with a specifi c concentration of the gibberellin and 5-azacytidine at a low temperature. The growth period of the spring wheat in summer reproduction was delayed, and their agronomic traits gradually decreased with the passage of the sowing time. Thus, spring wheat should be sown at the earliest time possible for better yield. June 25 should be the latest date for summer reproduction of the wheat, but the semi-winter wheat cultivars in Xundian County should be added generation in summer after being treated at 2℃ for 10 days. Xundian County is a suitable location for summer reproduction of the wheat in China.
基金Supported by"Thirteenth Five-Year"Key Research and Development Project Sub-project"Integration and Demonstration of Spring maize Solar and Hot Water Resources Utilization Technology in Humid Areas of Heilongjiang Province"(2018YFD0300103-1)。
文摘In order to determine the most suitable sowing periods for maize in the cold area of Harbin City,the field test method was adopted.From 2018 to 2019,the main maize variety Xianyu 696 which was planted in Harbin City,Heilongjiang Province,was used as the test material for the six-sowing-period treatment experiments.The sowing period settings were as the followings:April 20(T1),April 24(T2),April 27(T3),May 4(T4),May 11(T5)and May 18(T6).In the experiment,the effects of different sowing periods on the growth and development,yields and quality of maize were studied.The results showed that the maize through T1 treatment had the longest growth period,the lowest height and the highest ear height,and the highest grain protein content.The maize through T6 treatment had the highest height and ear height,as well as the highest starch and oil content.And the grain crude fat,soluble protein,soluble sugar and the moisture content increased and then decreased with the delay of the sowing period.The maize through T4 treatment had the highest content of soluble protein.However,other quality indicators and the number of rows,the length of the bald tip,the number of grains per spike and the weight of 100 grains first increased and then decreased with the delay of the sowing period.The dry matter accumulation through T4 treatment was significantly higher than the ones through five treatments,and the 100-kernel weight and other ear-grain traits were the highest,the maizes through T4 treatment increased the yield by 21.54%compared with that through T1 treatment.Thus,the most suitable sowing period for the maize in the cold area of Harbin City was from May 4 to May 11.It provided technical supports for guiding maize planting in the cold area of Harbin City.
