甘薯氮磷钾肥平衡施用效应分析

Effect of nitrogen, phosphorus and potassium balanced application on sweet potato

本文运用311-A拟饱和最优回归设计,在沿海赤砂土甘薯主产区设置晚薯施用氮磷钾肥料试验,模拟出甘薯薯块产量和施肥利润的氮磷钾肥料效应函数,通过极值判别均为典型函数,用边际分析寻优,获得甘薯薯块最高产量和最高施肥利润的优化施肥组合分别为:Zmax为Z1=N136 25kg/hm2,Z2=P2O552 71kg/hm2,Z3=K2O275 68kg/hm2,薯块产量最高,^ymax=39 214t/hm2;Zopt为Z1=N117 09kg/hm2,Z2=P2O546 24kg/hm2,Z3=K2O247 01kg/hm2,施肥利润最佳为^πopt=18298 99元/hm2。

Using 311A optimum regression design,a NPK fertilizer trial was designed and conducted in the main cropping area of late sweet potato in a coastal sandy soilThe fumctions of fertilization effect of sweet potato tube yield and its profit were obtained,which were both typical functionsThrough mathematical calculation and analysis,it was clear that the amount of NPK fertilizers was N 13625 kg/hm2,P2O5 5271kg/hm2 and K2O 27568 kg/hm2,respectively when maximum yield was achievedThe above three fertilizers were 11709,4624 and 24701 kg/hm2 respectively when maximum profit of fertilization was realizedThe maximum yield and maximum profit were 39214 t/hm2 and 1829899 Yuan/hm2,separately