摘要
通过田间试验研究了云南省昆明市小哨红壤旱坡地氮、磷、钾肥配合施用对玉米产量和养分吸收的影响。结果表明:钾肥的农学效率>磷肥的农学效率>氮肥的农学效率。施氮60kg/ha,玉米产量最高,为9792.5kg/ha,氮肥的农学效率最高,每kg氮肥增产玉米20.7kg;随着施氮量的增加,氮肥的农学效率迅速下降。玉米产量随施磷量的增加而增加,施P2O590kg/ha,磷肥的农学效率最高,每kgP2O5增产玉米30.1kg,磷肥的农学效率随着施磷量的增加逐渐下降。玉米产量随着施钾量的增加而增加,施K2O90kg/ha,钾肥的农学效率最高,每kgK2O增产玉米32.4kg,钾肥的农学效率随着施钾量的增加趋于下降。
A field experiment was conducted in sloping red soil in Xiaoshao county of Yunnan province to investigate effect of different nitrogen(N),phosphorus(P)and potassium(K)combinations on nutrient uptake and yield of summer corn.Results showed that the agronomic efficiency of the three types of fertilizers was determined as K>P>N.The N rate at 60 kg/ha achieved the highest corn yield(9792.5 kg/ha)and agronomic efficiency(20.7 kg/kg K 2 O).Above this rate,corn yield and N efficiency decreased.Corn yield increased with an increase in P rates while agronomic efficiency of P reached the highest(30.1 kg/kg P 2 O 5)at 90 kg P 2 O 5/ha.The same as P,corn yield increased with an increase in K rates while agronomic efficiency of K reached the highest(32.4 kg/kg K 2 O)at 90 kg P 2 O 5/ha.As the P or K rate was above 90 kg/ha,its agronomic efficiency declined.
作者
刘建香
郭云周
张国建
吴杏红
杨袁刚
Liu Jianxiang;Guo Yunzhou;Zhang Guojian;Wu Xinhong;Yang Yuangang(Institute of Agricultural Environment and Resources,Yunnan Academy of Agricultural Sciences Yunnan Kunming 650205;Yunnan Agricultural College in Vocational Skills Yunnan Kunming 650031)
关键词
玉米
氮
磷
钾
产量
农学效率
Corn
Nitrogen
Phosphorus
Potassium
Yield
Agronomic efficiency
