作者分析了江苏省晚播采种甜菜的生育特点及其需肥规律,提出亩产200kg的肥料运筹“促、控、促”三字方针,认为,采种甜菜全生育期用N不低于16.5kg/亩(底苗肥占40％、越冬后至4月占60％为好),P_2O_5不低于7.5kg/亩。经采用重复D饱和设计试验结果认为,返青后施N(尿素)最佳施用量为12.5kg/亩,最佳施用期为4月1日左右。 The authors analyzed the characteristics of bear breeding and the rule of its need to be planted in late sowing in Jiangsu Province. It proposed that the principle of “promoting, controlling and promoting” fertilizers with a yield of 200kg per mu should be adopted. It is considered that N should be not less than 16.5kg / Mu (40% seedling fertilizer, winter to April after 60% is good), P_2O_5 not less than 7.5kg / mu. After repeated D-saturation design test, the optimal application rate of N (urea) after rejuvenation is 12.5kg / mu and the best application period is about April 1.