种肥分层播施是一项新的农业增产技术措施。种肥分层就是化肥深于种子,中间用土将种肥隔开的一种播种方法。我所从1981年冬开始研制种肥分层播种机。近几年来与同类播种机械进行了对比试验,增产效果显著。增产幅度一般在10～20%左右。目前国内大部分地区使用的播种机械虽有些是种肥分开的播种施肥机具,但不能实现种肥分层播施,另外,播种施肥与中耕不能通用。根据这种情况,我所研 Stratification of seed fertilizer is a new technical measure to increase agricultural output. Fertilizer layering is fertilizer deep in the seeds, the middle of the soil will be kind of fertilizer separated by a sowing method. Since the winter of 1981, we have started to develop a seed layering planter. In recent years with similar sowing machinery conducted a comparative test, a significant yield increase. Yield increase is generally about 10 ~ 20%. At present, although the sowing machines used in most areas in China are some kind of separate sowing and fertilizing machines, they can not be applied in different layers. In addition, sowing and fertilizing can not be used universally. According to this situation, I study