减缓施肥对水稻生长和产量形成的影响

为了探讨海南水稻氮肥运筹达到提高产量、减少施肥对环境污染的目的，以籼型杂交稻特优669为材料，研究减少水稻前期氮肥施用量并延缓氮肥施用时期（减缓施肥）与当地习惯施肥对水稻生长及产量的影响。结果表明：减缓施肥在分蘖期和孕穗期分蘖数少、植株矮小、叶面积小、干物质积累少，在结实期叶面积减少缓慢、群体干物质生产能力较高；减缓施肥在减少氮、磷、钾肥施用量的条件下，通过较高成穗率弥补前期分蘖数少，以较高成穗率和高结实率获得了比习惯施肥略高的产量。

Effect of Reduced and Delayed Fertilization on Growth and Yield Formation in Rice

Using nitrogen strategies to increase yield and reduce fertilizer pollution to environment in Hainan was studied.The cultivar of Teyou669(indica)was used to study the effect of reduced and delayed fertilization and local fertilization on the growth and yield in rice.The results indicated that rice using reduced and delayed fertilization was fewer tillering,dwarfer plant,smaller leaf area and less dry matter accumulation at tillering stage and booting stage.Leaf area decreased slowly and dry matter accumulated fast at productive phase.High panicle bearing tiller rate and seed setting rate compensated few tillering.The reduced and delayed fertilization could obtain higher yield than the local fertilization.