A kind of method for reducing nicotine content of upper tobacco leaves of flue-cured tobacco

Abstract

The invention provides a method for reducing nicotine content in the upper part of flue-cured tobacco. The method includes applying a carbon source; the applying the carbon source includes applying the carbon source for the first time and applying the carbon source for the second time. The present invention can effectively reduce the content of nicotine and total nitrogen in the upper leaves of flue-cured tobacco; the total nitrogen content of the upper six leaves of flue-cured tobacco detected on the 150th day after transplanting is 3.89-4.40%; the content of nicotine in the upper six leaves of flue-cured tobacco is 1.35-2.13% . The invention can effectively promote the yellowing of the tobacco leaves, and the SPAD value of the upper six leaves of the flue-cured tobacco on the 138th day after transplanting is 40.30-42.80. The present invention accelerates the microbial fixation of available nitrogen in the soil, prolongs the time for the microbial fixation of soil nitrogen, can effectively control the soil nitrogen level 120-138 days after transplanting, and the inorganic nitrogen content in the soil is 0-20.08mg N kg ‑1 .

Description

technical field [0001] The invention relates to a method capable of reducing the nicotine content in the upper leaves of flue-cured tobacco, belonging to the technical field of flue-cured tobacco planting. Background technique [0002] Flue-cured tobacco is one of the important economic crops in my country, although the planting area and tobacco leaf output have ranked first in the world (Zhu Zunquan, 2008). However, compared with advanced flue-cured tobacco producing countries, such as the United States and Zimbabwe, there is still a big gap in the tobacco leaves produced in our country, mainly reflected in the lack of overall aroma, thick upper tobacco leaves, and high nicotine content (Li Chunjian et al., 2007) . In addition, due to the implementation of the US FDA "Tobacco Product Standard for Nicotine Level of Combusted Cigarettes" program, "low nicotine" has become the focus of attention in the 8th and 9th conferences of the International Tobacco Scientific Research C...

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Problems solved by technology

[0005] CN109328957A discloses a method for controlling nitrogen and increasing quality of flue-cured tobacco soil in high organic matter tobacco fields, and mentions the importance of controlling soil nitrogen supply in the late growth stage of flue-cured tobacco. Before transplanting flue-cured tobacco, rice straw with high C / N ratio is returned to the field to regulate Soil nitrogen mineralization capacity, in order to coordinate soil nitrogen supply capacity during the growth of flue-cured tobacco, the disadvantage of this method is that during the growth of flue-cured tobacco, climatic factors cannot be controlled, and changes in soil temperature and humidity will lead to the decomposition process of straw changes happened

For example, if there is high temperature and rainy weather in the early stage of flue-cured tobacco growth, the rice straw will decompose faster at this time, that is, release more effective carbon sources. Insufficient nitrogen in the early growth stage, the effect of reducing nicotine content in flue-cured tobacco is not good

[0006] In the study of controlling excessive nitrogen supply in tobacco-planting soil at the later stage of flue-cured tobacco growth, the applicant found that although the use of certain types of exogenous carbon can accelerate the microbial fixation of available nitrogen in the soil, the inorganic nitrogen that has been assimilated by microorganisms is prone to regeneration. Mineralization leads to a gradual increase or large fluctuation of the nitrogen level in the soil, that is, the soil nitrogen is held by microorganisms for a short period of time, resulting in green and late maturity of the tobacco leaves, and it is difficult to reduce the nicotine and total nitrogen content of the upper tobacco leaves of the flue-cured tobacco in the late growth period

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