水稻前氮后移施肥初探

经过1 a三点的试验,可初步看出,返青、分蘖肥的多少对单位面积有效穗数并不起决定性作用,前期施入过多的氮肥,反而造成稻株发育不健壮,无效分蘖多,过早封垄,群体过分繁茂,通风透光性能差,容易发生病、虫危害,低部叶片过早枯死,中后期易脱肥,容易发生早衰,容易造成倒伏等弊端。同时可以看出,施用接力肥和保花肥对水稻每穗粒数及千粒重的增加有明显的作用。从产量上来看,施用接力肥和保花肥的处理（前氮后移）比前重型施肥增产明显,约增产10%～45%。

A Preliminary Study of Postponing Nitrogen Fertilisers on Rice

The test indicated that green return fertiliser and tillering fertilizer can not play a decisive role on effective panicles per unit area, excessive nitrogen fertilizer can cause dysplastic plants, excess ineffective tillers, early sealing ridging, excessive exuberance, low permeability, plant diseases and insect pests, early dead bottom leaves, early senescence and lodging et al. then, the relay fertilisers and flower conserving fertilizer can increase grains per panicle and 1000 grains weight obviously, it can increase the yield by 10%-45%.