为了研究青料玉米不同叶龄期施用氮化肥的效果,以探索氮化肥的施用规律,从而为青料玉米科学施肥提供依据,我们进行了青料玉米不同叶龄期施用氮素的效应试验。现将试验总结如下,供参考。一、试验方法 1986年有3个参试单位,试验设10个处理,即无肥区(CK)、0叶、2叶、4叶、6叶、8叶、10叶、12叶、14叶、16叶。1987年参试单位有4个,试验设9个处理,即无肥区(CK)、0叶、4叶、6叶、8叶、10叶、12叶、14叶、常规。除无肥区(CK)不施肥外,其余处理总施肥量每亩为硫铵60或75公斤,另加普钙30公斤作基肥。氮化肥的运筹为,0叶处理的全部作基肥:常规处理的基种肥占40％,拔节肥(叶龄指数31.6％时施用)占40％,穗肥(大喇叭口期,叶龄指数61.7％时施用)占20％;其余处理的基种肥占50％,追肥(当植株展开叶达各处理相应的叶片数时 In order to study the effect of application of nitrogen fertilizer on the different leaf ages of green corn to explore the rule of application of nitrogen fertilizer and to provide basis for scientific fertilization of green corn, we conducted experiments on the effect of nitrogen application at different leaf ages of green corn. The test is summarized as follows for reference. First, the test method 1986, there are three participating units, the trial set 10 treatments, namely no fertilizer area (CK), 0 leaves, 2 leaves, 4 leaves, 6 leaves, 8 leaves, 10 leaves, 12 leaves, 14 leaves , 16 leaves. In 1987, there were 4 participating units. There were 9 treatments in the experiment, namely CK, 0 leaf, 4 leaf, 6 leaf, 8 leaf, 10 leaf, 12 leaf, 14 leaf, conventional. In addition to non-fertile area (CK) without fertilization, the rest of the total amount of fertilizer per acre treated ammonium sulfate 60 or 75 kg, plus additional calcium 30 kg as a base fertilizer. Nitrogen fertilizer operation, 0 leaf treatment of all the base fertilizer: the conventional treatment of 40% of base fertilizer, jointing fertilizer (leaf age index of 31.6% when applied) accounted for 40% of the panicle (large bell mouth, leaf age index 61.7% of the time) accounted for 20%; the rest of the treatment of the base fertilizer accounted for 50%, topdressing