Method of performing mixed sowing of astragalus sinicus and oilseed rape and returning green manures to field

Abstract

The invention provides a method for performing mixed sowing of astragalus sinicus and oilseed rape and returning green manures to the field. The method comprises the following steps: a, sowing astragalus sinicus, namely sowing seeds of astragalus sinicus 25-35 days before harvesting of late rice, and keeping field water suitable for growth of astragalus sinicus; b, sowing oilseed rape, namely oversowing seeds of oilseed rape 1-3 days after harvesting of late rice; c, turning over and pressing the astragalus sinicus and the oilseed rape, namely when the astragalus sinicus is in a full-blossom period and the oilseed rape is in a bud period, simultaneously turning over and retting two types of green manures about 15 days before planting of early rice, wherein routine ploughing, fertilizing and early rice transplanting can be performed after retting is performed for 8-10 days. The method provided by the invention can be used for solving the problems of single planting variety and single planting structure in production and utilization of green manures in the southern double-crop rice region, effectively solving the problems that green manure nutrients are imbalanced after uni-sowed Chinese milkvetch or oilseed rape is turned over and pressed and thus nutrient supply can not meet the requirements of the whole early rice growth period on the nutrients, and the like, being beneficial to the improvement on the yield and quality of aftercrop early rice and playing a role in directly promoting the green manure development re-arisen in China.

Description

technical field [0001] The invention relates to a method for returning milk vetch and rapeseed green manure to the field. Background technique [0002] Green manure refers to fresh green plants that can be plowed into the soil as fertilizer. It is a high-quality organic fertilizer that has a good effect on improving soil and fertilizing soil. Green manure also has the functions of providing nutrients, rationally using land and raising land, Partially replace chemical fertilizers, promote high crop yields and ensure food security. [0003] Planting green manure in winter can make full use of crop stubble without affecting the production process of main crops. The development of green manure production has great prospects. The existing green manure planting in Hunan Province has the problems of single green manure varieties and single planting structure: green manure planting is mainly based on rice field winter green manure, and the varieties are basically limited to legumin...

AI Technical Summary

Problems solved by technology

The existing green manure planting in Hunan Province has the problems of single green manure varieties and single planting structure: green manure planting is mainly based on rice field winter green manure, and the varieties are basically limited to leguminous green manure milk vetch, and other green manure species are less planted; in the planting structure Mainly single sowing milk vetch, mixed sowing and interplanting of different varieties of green manure are relatively rare

[0004] Under the modern farming system, the rice yield is continuously increasing, which increases the degree of canopy cover in the field, resulting in the emaciated seedlings of milk vetch. At the same time, a large number of seedlings are often killed due to the attack of strong cold air after the harvest of late rice. The serious shortage of basic seedlings affects the freshness. Grass yield, thus affecting the fertilizer effect of green manure on the next crop of early rice; at the same time, milk vetch is a green manure crop with high nitrogen nutrition due to the nitrogen fixation effect of its rhizobia, but the content of phosphorus and potassium in fresh grass of milk vetch is low , there is a problem of unbalanced nutrients in milk vetch alone; moreover, the fresh grass of milk vetch is relatively low in carbon and nitrogen, the stems and leaves are fresh and tender, and the lignin is low. The nutrient supply is better in the early stage, but poor in the later stage. Therefore, the rice grows fast in the early stage and the leaves are dark green, but the grains are lighter and the empty shell rate is higher, which is not conducive to the high yield of early rice.