A field experiment about effects of nitrogen application rates and different NO3-N to NH4-N ratios on agronomic, chemical and biological characteristics as well as yield and quality of flue-cured tobacco grown in a bl...A field experiment about effects of nitrogen application rates and different NO3-N to NH4-N ratios on agronomic, chemical and biological characteristics as well as yield and quality of flue-cured tobacco grown in a black soil was conducted from 2004 to 2005 in Heilongjiang Province. The results showed that the nitrogen application rates at 45 kg·hm^-2 with the ratio of 75% NO3-N to 25% NH4-N resulted in the highest potassium and reducing sugar contents in the flue-cured tobacco leaving with the highest quality grade and value. It is recommended that this ni- trogen application rate and NO3-N to NH4-N ratio should be widely applied on flue-cured tobacco grown in the black soil in Heilongjiang Province.展开更多
分别采用光沉积法和浸渍法制备了载钯石墨相氮化碳催化剂(Pd/g-C3N4-PD和Pd/g-C3N4-IMP),并对其进行了电感耦合等离子体发射光谱(ICP-AES)、X射线衍射(XRD)、透射电镜(TEM)和Zeta电位的表征.结果表明,不同载钯量Pd/g-C3N4-PD的等电点均...分别采用光沉积法和浸渍法制备了载钯石墨相氮化碳催化剂(Pd/g-C3N4-PD和Pd/g-C3N4-IMP),并对其进行了电感耦合等离子体发射光谱(ICP-AES)、X射线衍射(XRD)、透射电镜(TEM)和Zeta电位的表征.结果表明,不同载钯量Pd/g-C3N4-PD的等电点均在p H 2.3左右;Pd/g-C3N4-PD表面Pd粒子分散均匀,且Pd粒径小于Pd/g-C3N4-IMP.分别将Pd/g-C3N4-PD和Pd/g-C3N4-IMP用于2,4-二氯酚的催化加氢脱氯研究,Pd/g-C3N4-PD的催化脱氯效果明显优于Pd/g-C3N4-IMP.低p H值利于2,4-二氯酚的催化加氢脱氯过程,但不利于保持催化剂的稳定性.展开更多
文摘A field experiment about effects of nitrogen application rates and different NO3-N to NH4-N ratios on agronomic, chemical and biological characteristics as well as yield and quality of flue-cured tobacco grown in a black soil was conducted from 2004 to 2005 in Heilongjiang Province. The results showed that the nitrogen application rates at 45 kg·hm^-2 with the ratio of 75% NO3-N to 25% NH4-N resulted in the highest potassium and reducing sugar contents in the flue-cured tobacco leaving with the highest quality grade and value. It is recommended that this ni- trogen application rate and NO3-N to NH4-N ratio should be widely applied on flue-cured tobacco grown in the black soil in Heilongjiang Province.
基金National Natural Science Foundation of China(21373159)Project of Science&Technology Office of Shananxi Province(2015SF291,2013K11-08,2013SZS20-P01)Shaanxi Provincial Education Department Found(15JS119)
文摘分别采用光沉积法和浸渍法制备了载钯石墨相氮化碳催化剂(Pd/g-C3N4-PD和Pd/g-C3N4-IMP),并对其进行了电感耦合等离子体发射光谱(ICP-AES)、X射线衍射(XRD)、透射电镜(TEM)和Zeta电位的表征.结果表明,不同载钯量Pd/g-C3N4-PD的等电点均在p H 2.3左右;Pd/g-C3N4-PD表面Pd粒子分散均匀,且Pd粒径小于Pd/g-C3N4-IMP.分别将Pd/g-C3N4-PD和Pd/g-C3N4-IMP用于2,4-二氯酚的催化加氢脱氯研究,Pd/g-C3N4-PD的催化脱氯效果明显优于Pd/g-C3N4-IMP.低p H值利于2,4-二氯酚的催化加氢脱氯过程,但不利于保持催化剂的稳定性.
