Effects Of Different Nitrogen Levels On Soil Properties And Growth,Yield And Quality Of Flue Cured Tobacco

Nitrogen is one of the most important elements affecting the growth and development of tobacco,but also the key influence the quality and yield of the elements According to the Wenshan tobacco production process of perennial fertilizer and improper fertilization resulted in soil acidification,decreased soil organic matter content,nutrient imbalance,and even in some areas there is more ser:ious soil compaction,seriously affecting the quality of Wenshan tobacco growing areas for tobacco production.Based on this,the Yunnan Provincial Tobacco Monopoly Bureau(company)and Wenshan Tobacco Monopoly Bureau(company)financial support,carried out under different nitrogen levels of improvers for soil improvement and effect on flue-cured tobacco growth,yield and quality of flue cured tobacco.This experiment mainly by setting CK-no nitrogen,no soil conditioner;T1一n n T2-polyacrylamide 30.0kg/hm2;no nitrogen fertilizer,humic acid 30.0kg/hm2;T3-N fertilizer lime 30.0kg/hm2;T4-n45.0kg/hm2,n T5-30.Okg/hm2;45.Okg/hm2,30.Okg/hm2 humic acid;T6-45.Okg/hm2 30.0kg/hm2 T7-,application of lime nitrogen fertilizer;67.5kg/hm2,T8-67.5kg/hm2 30.Okg/hm2;nitrogen fertilizer,humic acid 30.Okg/hm2;T9-n 67.5kg/hm230.0kg/hm2 10 application of lime treatment under diuaierent nitrogen levels of various modifiers on soil physicochemical properties and microbial group number effect and influence of various modifiers on growth of Flue-cured Tobacco under different nitrogen levels and different nitrogen levels under various amendments on the chemical composition of flue-cured tobacco and the yield and quality.Study on the three aspects of sound,and then screened in Wenshan tobacco area the best quantity of nitrogen fertilizer and amendments to the ideal formula for the improvement and fertilization in Wenshan tobacco soil,improve the quality and yield of tobacco can be continued on.The results showed that1.Under different nitrogen levels of improvers combination can improve the physicochemical properties of soil and increase the quantity of soil microbial groups of tobacco plant By improving nitrogen fertilizer on soil physicochemical properties and microbial number of groups have a certain role in promoting,but a relatively low amount of nitrogen fertilizer on soil physicochemical properties improvement efifect is not obvious,reaching 67.7kg/hm2,compared with no nitrogen significantly;soil applied,humic acid and lime soil improvement three agents can improve soil properties,reduce soil bulk density,increase soil porosity,improve soil moisture,increase soil nitrogen,phosphorus,potassium and organic matter content,the humic acid on soil nutrient elements to enhance the effect of the most significant,followed by polyacrylamide,finally is slaked lime.The number of different levels of nitrogen fertilizer applied soil amendments could significantly increase the soil bacteria,fungi and actinomycetes,microbial populations,of which three kinds of modifiers on bacteria to increase the number of the most significant2.Different levels of nitrogen application improved agent combination can significantly promote the growth of tobacco plants Nitrogen in flue-cured tobacco in various growth periods could promote the growth of flue-cured tobacco in the rosette stage of flue-cured tobacco growth promoting effect is not obvious,and the growth of flue-cured tobacco fast-growing stage had significantly increased the plant height,maximum leaf length and Ye Kuan,the largest leaf area and biomass,the most obvious effect in the nitrogen fertilizer reached 67.7kg/hm2 promotion;polyacrylamide,humic acid and lime could significantly promote the growth of Flue-cured Tobacco with humic acid on tobacco growth promoting effect is most obvious in the long term,flourishing and dome period to promote the most significant effect,significantly improve the nutrient content of nitrogen,phosphorus and potassium in tobacco.3.Different levels of nitrogen application improved agent combination can improve the yield and quality of tobacco leaf Nitrogen can improve the yield of tobacco,in which nitrogen fertilizer reached 67.7kg/hm2 tobacco yield reached the maximum,and the combined application of soil amendments could significantly increase the quality of tobacco leaves in a certain extent,the humic acid to improve the quality of tobacco leaf was the most.The proportion of first-class tobacco with nitrogen and with 45kg/hm2 humic acid was the highest,reaching 23.4%;each treatment could increase the content of potassium in flue-cured tobacco leaves,the maximum can reach 2.84%;the nitrogen fertilizer soil conditioner can improve the appearance quality of tobacco leaves,applying humic acid to 45kg/hm2 and the highest nitrogen.We can reach 67.