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
Correlation and path coefficient analyses were conducted for 10 characteristics of 24 pure lines of flue-cured tobacco such as plant height, knot distance, leaf number, the central leaf length and width, ratio of the ...Correlation and path coefficient analyses were conducted for 10 characteristics of 24 pure lines of flue-cured tobacco such as plant height, knot distance, leaf number, the central leaf length and width, ratio of the length to width, stem girth, dates of budding, leaf yield and ratio of the prime-medium tobacco. The leaf number and the central leaf length showed a positive or a strong positive correlation with the yield per plant. And the leaf number and leaf yield per plant showed a strong positive correlation with the ratio of prime-medium tobacco. The results showed that the leaf yield per plant among these characteristics played a major role in determining the ratio of prime-medium tobacco while the others were less related with the ratio. Square sum of deviation method cluster analyses showed that 24 pure lines of flue-cured tobacco were clustered into two groups. Of the pure lines, Line T1706 and Line T1245 had a far relationship with all other lines, and also had a heterosis when crossed with the other lines. Lines Guangdonghuang 1 and R72（3）B-2-1 were closely related.展开更多
The flavor composition in fresh leaves,flavescent leaves and flue-cured tobacco leaves was identified and analysed by using simultaneous distillation and extraction equipment and GC-MS.The results showed that some of ...The flavor composition in fresh leaves,flavescent leaves and flue-cured tobacco leaves was identified and analysed by using simultaneous distillation and extraction equipment and GC-MS.The results showed that some of odour component,such as leaf alcohol and its ester,etc,were gradually decreased,and finally all of them disappeared.Some valuable flavor compound,such as β-damascone,farnesyl acetone,neophytadiene,fufural,megastigmatrienone,dihydroactinodiolide,geranyl acetone etc,were largely increased during curing.And some new compounds such as 4-cyclopentene-1,3-dione,2-acetylfulan,4-oxo-α-ionoe,2-methyltetrahydro-furan-3-one,maltoxazine etc were also detected at the end of curing.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Supported by Platform Construction for Germplasm Resources of China Tobacco (2007, 152)
文摘Correlation and path coefficient analyses were conducted for 10 characteristics of 24 pure lines of flue-cured tobacco such as plant height, knot distance, leaf number, the central leaf length and width, ratio of the length to width, stem girth, dates of budding, leaf yield and ratio of the prime-medium tobacco. The leaf number and the central leaf length showed a positive or a strong positive correlation with the yield per plant. And the leaf number and leaf yield per plant showed a strong positive correlation with the ratio of prime-medium tobacco. The results showed that the leaf yield per plant among these characteristics played a major role in determining the ratio of prime-medium tobacco while the others were less related with the ratio. Square sum of deviation method cluster analyses showed that 24 pure lines of flue-cured tobacco were clustered into two groups. Of the pure lines, Line T1706 and Line T1245 had a far relationship with all other lines, and also had a heterosis when crossed with the other lines. Lines Guangdonghuang 1 and R72（3）B-2-1 were closely related.
文摘The flavor composition in fresh leaves,flavescent leaves and flue-cured tobacco leaves was identified and analysed by using simultaneous distillation and extraction equipment and GC-MS.The results showed that some of odour component,such as leaf alcohol and its ester,etc,were gradually decreased,and finally all of them disappeared.Some valuable flavor compound,such as β-damascone,farnesyl acetone,neophytadiene,fufural,megastigmatrienone,dihydroactinodiolide,geranyl acetone etc,were largely increased during curing.And some new compounds such as 4-cyclopentene-1,3-dione,2-acetylfulan,4-oxo-α-ionoe,2-methyltetrahydro-furan-3-one,maltoxazine etc were also detected at the end of curing.
