氮磷钾配比对红薯产量的效应分析

Analysis of Nitrogen, Phosphor and Kalium Formula Fertilization Effect for Sweet Potato Yield

为了解汨罗市红壤土的肥力状况和红薯的需肥规律,对红薯氮磷钾肥料效应进行了研究,结果表明:红壤土种植红薯的最佳施肥量为N 9.05 kg/667m2、P2O56.48 kg/667m2、K2O 10.50 kg/667m2,最佳经济产量为2 025.3 kg/667m2。红薯最高产量时N、P2O5、K2O的配比是1:0.79:1.33,这符合红薯喜钾特性。

To further understand the situations of red soil fertility and the fertilizer requirement laws of sweet potato in Miluo city,the fertilizer effects of nitrogen,phosphor and kalium to sweet potato were studied.The results indicated that the optimal fertilizer rate for nitrogen,phosphor and kalium was 116.55 kg/hm2,72.60 kg/hm2and 109.50 kg/hm2,respectively;the best economic yield was 29 470.5 kg/hm2.The yield of sweet potato was the highest when ratio of N to P2 O5 to K2 O was 1:0.79:1.33,which accord with the potassium-like character of sweet potato.