特旱年旱地玉米限额补灌水肥效应分析

采用田间试验方法研究了旱地玉米限额补灌的水肥效应。结果表明，玉米小喇叭口期灌水675mm／hm2，平均增产玉米2171.5kg／hm2，增产率89．27％，灌水生产效率为3.217kg／mm;3种肥料的增产效果为N＞M＞P。未灌水条件下，3种肥料的增产效果为M＞P＞N。配合施用的增产效果为NPM＞NP。

Effects of Water and Fertilizers on Rainfed Spring Corn under Limited Irrigation in a Extremely-severe Drought year

Effects of water and fertilizers on rainfed spring corn under limied irrigation were studied by using field experiment. Restilts showed that irrigation of 675mm in the ear-bearing stage can increase corn yield by 2171. 5kg/hm2, that is 89. 27% increase,and the irrigation production rate is 3. 217kg/mm.The yield-increasing effect of fertilizers is N>M>P under irrigation. Whereas the case is M>P>Nunder control, the yield-increasing effect of combining application of fertilizers is NPM>NP.