Double cropping rice nitrogen-saving high-yield production method

Abstract

The invention relates to a double cropping rice nitrogen-saving high-yield production method. A double cropping rice planting region is selected; 15 to 30 days before late rice is harvested, astragalus sinicus planting is carried out; after the late rice is harvested, ditching is carried out according to an astragalus sinicus planting technology; 30 to 50kg of calcium magnesium phosphate fertilizer is applied per mu; 1 to 2kg of potassium chloride used as a base fertilizer is applied per mu; 10 to 15 days before early rice is transplanted, dry tillage and plowing pressing are carried out; land preparation is carried out according to the early rice planting requirements; azolla is bred; and after shoal water of field water, which has a height of 1.5 to 3.5cm, is kept for 8 to 10 days, the base fertilizer is applied to carry out early rice transplanting. During growth of the early rice and the late rice, duckweed utilization is naturally carried out; before the late rice is transplanted, a sustained-release nitrogen fertilizer is applied in one step as the base fertilizer; and on mid-to-late September in the next year, circulation operation of farming of planting astragalus sinicus green manure crops and the like is carried out. According to the invention, astragalus sinicus green manure is planted during the slack winter season of double cropping rice planting, the azolla is bred during growth of rice, the rice special sustained-release nitrogen fertilizer is applied to the late rice in a decreasing manner, the astragalus sinicus and the azolla are utilized to fix nitrogen and adsorb carbon, the land is maintained by the land, organic materials and an organic nitrogen source are provided for rice, nutritive substances in the double cropping rice field, which are easy to loss, are adsorbed, non-point source pollution is reduced and fertilizer supply and the fertilizer requirement of rice are coordinated and consistent.

Description

technical field [0001] The invention relates to a production method for double-cropping rice with low nitrogen and high yield. Background technique [0002] Rice is the main food crop in the world. About half of the world's population uses rice as a staple food. In my country, more than 60% of the population uses rice as a staple food. With the continuous reduction of arable land and the continuous increase of population, the problem of food security has become more and more prominent. In order to obtain a higher rice yield per unit area, people often obtain high yield by increasing input one-sidedly, which will inevitably lead to huge waste of resources and serious environmental pollution, making the contradiction between high yield, high efficiency and ecology more prominent. [0003] At present, the modern rice planting in China pursues high yield while ignoring the scientific matching and rational application of fertilizers. The high yield is based on high chemical fert...

AI Technical Summary

Problems solved by technology

In order to obtain a higher rice yield per unit area, people often obtain high yield by one-sidedly increasing input, which will inevitably lead to huge waste of resources and serious environmental pollution, making the contradiction between high yield, high efficiency and ecology more prominent

[0003] At present, the modern rice planting in China pursues high yield while ignoring the scientific matching and rational application of fertilizers. The high yield is based on high chemical fertilizer input, resulting in continuous decline in farmland quality, continuous decline in the return rate of fertilizer input, and non-point source pollution caused by nutrient loss. Intensified, especially in double-cropping rice cultivation, this phenomenon is more obvious, excessive fertilizer, nutrient application imbalance caused by unreasonable application of fertilizer, environmental pollution, soil compaction, soil fertility degradation, food safety issues are also increasingly prominent , of which excessive nitrogen fertilizer application is the most common, and the nitrogen use efficiency is only 10.8% to 40.5%.

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