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.