早稻平衡施用氮磷钾肥肥料效应的研究

Fertilizer Effect of Balanced Application of N, P and K to Early-rice

采用"3414"最优回归设计方法,对早稻氮磷钾肥料合理配施技术进行了研究。结果表明:在养分丰缺情况为低氮、中磷、中钾的潴育潮沙泥田,土壤对产量的当季贡献率是56.4%;氮、磷、钾肥料当季利用率分别为N33.3%、P2O518.0%、K2O28.4%;氮、磷、钾肥料的农学效率分别是N14.7kg/kg、P2O516.3kg/kg、K2O10.5kg/kg;氮、磷、钾肥料的偏肥生产力为23.57kg/kg。三元二次方程拟合结果表明:当N=168.9kg/hm2、P2O5=54.9kg/hm2、K2O=138.8kg/hm2,三要素比例为1∶0.325∶0.822时,早稻经济产量最高,可达7196.2kg/hm2。为建立完善该市测土配方施肥技术体系提供了理论依据。

The techniques of balanced applying N, P and K to early-rice were studied by using 3414 optimum regression design. The results showed that when contents of N, P and K in paddyfield were low, medium and medium, the contribution rate of soil to yield in the season was 56.4%; the utilization rates of N, P2O5 and K2O in the season were 33.3%, 18.0% and 28.4%, respectively; the agronomic efficiency of N, P2O5 and K2O in the season were 14.7 kg/kg, 16.3 kg/kg and 10.5 kg/kg, respectively; the partial fertilizer productivity of N, P and K was 23.57 kg/kg. The fitting results of simultaneous quadratic equation in three unknowns indicated that the economic yield of early rice was the highest （ 7 196.2 kg/hm^2） when N=168.9 kg/hm^2, P2O5=54.9 kg/hm^2 and K2O=138.8 kg/hm^2 with ratio of 1∶0.325∶0.822. These results provided a theoretic basis for establishing and perfecting balanced application system of fertilization.