超级稻Y两优2号栽培密度和优化施肥研究试验

Study of planting density and optimized fertilization on super rice Y Two Optimal Number 2

对超级稻Y两优2号进行栽培密度研究,结果显示:Y两优2号的适宜种植密度为18.0万～22.0万蔸/hm2。采用3元二次饱和D-最优设计,研究超级稻品种的施肥模型、氮磷钾养分施用的增产效果和施肥净收益。结果表明:在施用N、P2O5、K2O为275.0、135.0、280.0 kg/hm2时,预测最佳经济产量为10 370.0 kg/hm2,此时N∶P2O5∶K2O为1.00∶0.50∶1.02,氮磷钾肥增产率为63.3%,施肥净收益为6 442.0元/hm2。施肥不足时,产量和施肥收益的增长受氮肥影响最大,其次是钾肥,磷肥影响较小;过量施肥时,产量的衰减以氮肥最快、钾肥次之、磷肥最小,施肥收益的衰减以磷肥最快、氮肥次之、钾肥最小。

The result to study planting density of super rice Y two optimal number 2: the suitable planting density of Y two optimal number 2 were 180 000～220 000 plants/hm2.Using 'three elements secondary saturated D-optimal design' research fertilization model,yield increasing effect and fertilization net benefit of super rice varieties.The result showed: when using N,P2O5,K2O(N∶P2O5∶K2O=1.00∶ 0.50∶1.02) were 275.0 kg/hm2,135.0 kg/hm2 and 280.0 kg/hm2,the best predicted yields were 10 370.0 kg/hm2.The increasing rates of N,P,K were 63.3%,fertilization net benefit was 6 442.0 yuan/hm2.While fertilization insufficient,the biggest affect of yield and fertilization benefit increase first was N,second was K,last was P,but excessive fertilization,the reduce of the yield first was N,second was K,last was P.The reduce of the fertilization benefit first was P,second was N,last was K.