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.