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本文总结陕西渭北旱原中等肥力红(?)土夏谷及甘薯氮、磷、钾化肥试验结果,氮(N)肥用量范围0-20斤/亩,磷(P_2O_5)、钾(K_2O)肥用量为0-16斤/亩.用二次方程模型拟合并分别计算了经济最佳用量。建议的化肥用量夏谷为:尿素12斤+过磷酸钙(P_2O_512％)40斤+硫酸钾15斤/亩;甘薯为:尿素20斤+过磷酸钙75斤+硫酸钾15斤/亩.夏谷氮肥分两次施,1/3在拔节期,2/3在孕(?)期,增产效果优于一次施用。甘薯施肥的经济效益高于夏谷.
This paper summarizes the experiment results of nitrogen, phosphorus and potassium fertilizers in medium fertility red summer soil and summer sweetpotato in Weibei rainfed highland in Shaanxi province. The range of nitrogen (N) fertilizer application is 0-20 kg / mu, P 2 O 5 and K 2 O, The amount of fertilizer was 0-16 kg / mu. The quadratic equation model was fitted and the best economical dosage was calculated. The recommended amount of summer fertilizer for the fertilizer: urea 12 kg + superphosphate (P_2O_512%) 40 kg + potassium sulfate 15 kg / mu; sweet potato: urea 20 kg + superphosphate 75 kg + potassium sulfate 15 kg / mu Summer Valley nitrogen fertilizer twice, 1/3 at the jointing stage, 2/3 in the pregnancy (?) Period, the yield is better than one application. The economic benefits of sweet potato fertilization is higher than summer valley.