Method for intercropping oilseed rape in cotton field to serve as green manure

Abstract

The invention discloses a method for intercropping oilseed rape in a cotton field to serve as green manure. The method comprises the steps of A, variety selection, wherein oilseed rape varieties suitable for local ecological conditions and planting systems are selected; B, field preparation, wherein after cotton is harvested, cotton stalks are reserved; C, direct seeding of the oilseed rape, wherein the stage when the relative humidity of soil of the cotton field is 60%-80% is selected to conduct no-tillage, direct seeding and intercropping on the oilseed rape serving as the green manure, andduring seeding, oilseed rape seeds and dry soil or fine sand are uniformly mixed according to the proportion of 1:1, and then the mixture is sowed to the cotton field; D, application of fertilizer, wherein urea applied per mu serves as base fertilizer; E, smash and field returning, wherein from the last ten days of March to the first ten days of April of next year, the oilseed rape in the full-blossom stage and the cotton stalks are mechanically smashed on the spot to be returned into soil to serve as the green manure. The method is feasible and convenient to operate, multiple defects of the single application of fertilizer of current farmland are overcome, virtuous cycle of nutrients in a cotton field ecosystem is achieved, and the purposes of using land while maintaining the land, and reducing fertilizer and increasing the effect are achieved.

Description

technical field [0001] The invention belongs to the technical field of interplanting cotton and green manure, and more specifically relates to a method for interplanting rapeseed in a cotton field as green manure. It is especially suitable for the main cotton production areas in the Yangtze River Basin, and it is also suitable for the main cotton production areas in the "cotton-rape" double cropping planting mode in the Huanghuai River Basin. Background technique [0002] At present, in my country's cotton production, there are many phenomena such as continuous cropping of cotton fields for many years, soil compaction, serious shortage of soil organic matter content, year-by-year decline of comprehensive soil fertility, and increase of cotton field diseases year by year. The Yangtze River Basin is one of several major cotton-producing areas in my country. Every year, a large area of ​​slack cotton fields is not fully utilized, wasting natural resources. After the cotton is ...

AI Technical Summary

Problems solved by technology

However, in actual production, it is difficult to quickly decompose cotton stalks by microorganisms when they are directly crushed and returned to the field. The soil is looser and needs more water, so the straw needs to be fully decomposed by watering; 2) The degree of lignification of cotton straw is very high, and the carbon-nitrogen ratio required by soil microorganisms to decompose organic matter is 25:1 to 30:1. After returning to the field, a large amount of nitrogen fertilizer needs to be added, otherwise microorganisms will decompose the straw and compete for nitrogen and water in the soil, which is not conducive to the normal growth of subsequent crops

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