Method for Dongmu No.70 green manure plowing field-returning in northern cold tobacco growing area

Abstract

The invention belongs to the technical field of green manure plowing field-returning and discloses a method for Dongmu No.70 green manure plowing field-returning in a northern cold tobacco growing area. According to the YC/T142-1998 Investigation Methods of Tobacco Agronomic Characters, main agronomic characters of tobacco plants in each field are measured; grading and then statistics of tobacco yields, mean prices, output values and proportions of high, medium and low grade tobacco are carried out according to standard requirements in the GB 2635-1992 Flue-cured Tobacco, and main economic characters are investigated; field survey and sampling are carried out for tobacco in different plots, and C3F tobacco is extracted in processing and delivered to the Tobacco Quality Supervision and Inspection Test Center of the Ministry of Agriculture for testing and assessment; in harvesting of tobacco uppermost leaves is realized by a cutting-ring method, and a relative water content and a volumeweight of soil are measured; and soil organic matters are measured by a potassium dichromate volumetric method-an external heating method, and the content of water soluble chlorine ions is measured bya silver nitrate titration method. The method applies a green manure plowing technology for the tobacco area through green manure variety tests, and provides a theoretical basis for improving soil, fertility and tobacco quality.

Description

technical field [0001] The invention belongs to the technical field of green manure turning and returning to the field, and in particular relates to a method for turning and returning Dongmu 70 green manure to the field in cold and cold smoke areas in the north. Background technique [0002] At present, green manure has been widely used in tobacco field soil improvement in many high-quality flue-cured tobacco producing countries, and each has formed a different model. Although foreign countries have different index requirements for nutrient content in tobacco planting soil, the measures to increase soil organic matter content and improve soil physical and chemical properties by planting green manure are the same. Green manure overturning of tobacco fields is more common in the United States, Canada and other countries. After nearly 70 years of soil degradation in tobacco fields, green manure is planted in the fallow season of tobacco fields to restore soil fertility, improve...

AI Technical Summary

Problems solved by technology

[0004] Since the 1970s, the amount of chemical fertilizers used in my country's tobacco fields has increased, and the use of organic fertilizers has decreased significantly. Some major flue-cured tobacco planting areas have only used inorganic fertilizers for a long time, ignoring the use of organic fertilizers. Coupled with unreasonable planting systems, the soil fertility of tobacco fields Decrease year by year, organic matter content decreases, nutrient supply imbalance; soil compaction, ventilation condition degradation; soil microbial activity decreases, thus affecting the yield and quality of flue-cured tobacco, the nutritional ratio of the produced tobacco leaves is out of balance, less oil, insufficient aroma, restricting the quality of tobacco leaves improvement

[0006] Through the above analysis, the existing problems and defects of the existing technology are: the amount of chemical fertilizers used in the existing tobacco fields has increased, and the amount of organic fertilizers has been greatly reduced. Unreasonable planting system, the soil fertility of the tobacco field is declining year by year, the organic matter content is reduced, and the nutrient supply is imbalanced; the soil is compacted and the ventilation condition is degraded; the soil microbial activity is reduced, which affects the yield and quality of the flue-cured tobacco. The portion is small, the aroma is insufficient, and the improvement of the quality of tobacco leaves is restricted

[0007] The difficulty in solving the above problems and defects is as follows: (1) The time for overturning green manure of Dongmu 70 to return to the field is not yet clear, and overturning is too early, and the biomass of Dongmu 70 is small, which cannot improve the soil. The biomass of MU 70 is too large, and the decomposition time is prolonged, which affects the normal transplanting of tobacco; (2) There is no suitable machinery in the tobacco area to crush and return Dongmu 70 to the field. method, but the plant itself is relatively high, if it is not crushed, it will take a long time to decompose, which will affect the growth of tobacco. Some tobacco farmers adopt the method of manual crushing and returning to the field, but the cost input increases, which affects economic benefits

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