A crop rotation and no-tillage method for reducing the chloride ion content of tobacco leaves in field tobacco planting areas

Abstract

The invention discloses a crop rotation and no-tillage method for reducing chlorine iron content of tobacco leaves in a field tobacco planting area, which adopts tobacco, autumn potato, winter potato, rice, broad bean and flue-cured tobacco circular rotation planting and no-tillage direct seeding and no-tillage interplanting, and comprises the technologies of transplanting flue-cured tobacco and ridges for no-tillage interplanting autumn potatoes, planting winter potatoes, planting rice and no-tillage direct seeding of broad beans and fertilizing. The method provided by the invention can reduce water soluble chlorine ion content in tobacco planting soil in which the water soluble chlorine ion content is as high as 144.23 mg / kg by 68.88-69.26%, the chlorine ion content of the tobacco leaves produced in the soil is originally as high as 19.75g / kg and can be reduced by 70.51-76.05%, the potassium content and the ratio of potassium to chlorine of the tobacco leaves are increased, the ratio of the potassium to chlorine can reach 4.69, the standard of high-quality tobacco leave production can be met, the chemical contents of the tobacco leaves are more compatible, and therefore the quality of the tobacco leaves is improved. Meanwhile the labor cost is reduced by 240 yuan per mu.

Description

technical field [0001] The invention belongs to the technical field of crop planting, and in particular relates to a method for cultivating flue-cured tobacco. Background technique [0002] Tobacco is recognized as a plant that avoids chlorine and is sensitive to chlorine. The application of chlorinated fertilizers has not been advocated for a long time. However, chlorine is also a nutrient element of tobacco, which is responsible for certain physiological functions in tobacco, mainly in participating in photosynthesis, regulating the opening and closing of stomata, maintaining cell osmotic pressure, maintaining internal charge balance, and inhibiting pests and diseases. . Too high or too low chlorine content in tobacco leaves will affect the quality of tobacco leaves. Chloride ion content in tobacco leaves is 3-6g / kg, K 2 When O / Cl is in the range of 4 to 10, the tobacco leaves are soft in texture, moist in surface, full of elasticity, high in silk forming rate, good in ...

AI Technical Summary

Problems solved by technology

Since the soil colloids are mainly negatively charged, the chloride ions in the soil are rarely adsorbed and are easily leached with water. Therefore, after the rice-cured tobacco rotation, the chlorine applied to the soil is easily lost with the water, and generally can be leached. The 100cm soil layer was removed to keep the chlorine content of the plow layer soil at a low level. However, the rotation of winter potatoes and flue-cured tobacco, coupled with the drought in recent years, caused the soil water-soluble chloride ions to A large amount of accumulation, which in turn causes the tobacco leaves to increase the absorption of chloride ions, resulting in excessively high chloride ion content in tobacco leaves; secondly, it is caused by the change of planting crops. The original planting crop rice can not only reduce the chloride ion content of the plow layer soil through leaching, but also The amount of fertilizer applied is relatively low, and potatoes are economic crops that require a large amount of fertilizer, which is generally twice that of rice. In order to reduce the cost of fertilizer input, local farmers use a large amount of low-priced high-chlorine compound fertilizers, resulting in chlorine Ions accumulate in large quantities in the soil

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