杂交早稻特优128最佳施肥技术研究

采用"3414"最优回归设计,在海南中等肥力的砖红壤水稻土上对杂交早稻进行氮磷钾三因素肥料试验,建立回归模型,研究氮磷钾养分增产效应、肥料利用率,以当地习惯施肥为对照,研究施肥净收益。结果表明,杂交早稻特优128最佳经济施肥方案为:当N、P2O5、K2O施肥量分别为168.91、139.56、88.63 kg/hm2时,预测最佳经济产量为7 387.13 kg/hm2,此时N∶P2O5∶K2O为1∶0.83∶0.53;三因素中,氮肥增产率和肥料利用率最大,其次是钾肥和磷肥;氮磷钾肥合理配施可有效提高产量和肥料利用率;最佳经济施肥方案比农民习惯施肥增产和增收14%~15%,可作为生产实际推荐用量。

Study on fertilizer practice of hybrid rice Teyou 128

To study the effect of increase production and utilization rate of nitrogen,phosphorus and potassium of hybrid rice Teyou 128,we used"3414" optimal regression design,then set up the regression model.The results showed that the best program of economic fertilization was using N 168.91 kg/hm2,P2O5 139.56 kg/hm2,K2O 88.63 kg/hm2(N∶P2O5∶K2O=1.00∶0.83∶0.53).The best predicted yields were 7 387.13 kg/hm2.The best program of economic fertilization could cause production and income increased by 14%~15%,so we recommend the best program of economic fertilization.The best growth rate and fertilizer use efficiency was N,the next were K and P.