Effects of One-time Fertilization at the Root Zone of Flue-cured Tobacco on the Quality of Upper Tobacco Leaves
[Objective]The effects of one-time fertilization at the root zone on the growth and development of flue-cured tobacco and the quality of upper leaves in Zunyi tobacco growing area were explored,which provided theoretical support and technical basis for the flue-cured tobacco with high quality and yield and mechanized fertilization.[Method]The degradable cloth bags made from corn fiber were used to made the bagged fertilizer,and then were fertilized at the root zone at one time under the premise of reducing the application of nitrogen,phosphorus and potassium fertilizers.Taking the local fertilization pattern as CK(132.00 kg/hm2 pure nitrogen fertilizer+95.25 kg/hm2 phosphorus fertilizer+298.50 kg/hm2 potassium fertilizer),two treatments of fertilization combination were set as follow:XDF1,102.00 kg/hm2 pure nitrogen fertilizer+79.50 kg/hm2 phosphorus fertilizer+247.50 kg/hm2 potassium fertilizer+375.00 kg/hm2 bio-organic fertilizer,and the controlled-release fertilizers was used to replace 30%of the total amount of pure nitrogen fertilizer;XDF2,102.00 kg/hm2 pure nitrogen fertilizer+79.50 kg/hm2 phosphorus fertilizer+247.50 kg/hm2 potassium fertilizer+12.87 kg/hm2 biochar,and the controlled-release fertilizers was used to replace 50%of the total amount of pure nitrogen fertilizer.Then the growth and development,and the quality of upper leaves treated with reduced NPK fertilizer were analyzed.[Result]Compared with CK,XDF1 and XDF2 treatments had no significant effects on the growth and development of tobacco plants;XDF1 and XDF2 significantly improved the evaluation scores of appearance quality of tobacco leaves,with increases of 5.23%and 12.79%,respectively;The rate of first class of upper leaves was increased,with increase of 49.39%and 38.53%,respectively;The sugar-nicotine ratio,potassium-chloride ratio,and ratio of reducing sugar to total sugar of the upper part of the cured tobacco were increased by 29.13%and 4.43%,8.23%and 35.99%,4.17%and 1.39%,respectively.The content of nicotine and total nitrogen were individually decreased by 13.19%and 1.17%,9.43%and 3.69%.[Conclusion]Using small bag fertilizer of degradable cloth bags made from corn fiber can change the fertilization site of tobacco planting for one-time root zone fertilization,and can significantly improve the quality of upper tobacco leaves in the tobacco planting area while reducing fertilizer usage and production costs.
NETL
NSTL
万方数据
