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氮素化肥的施用技术,对夏玉米产量有着密切的关系。我所通过多年的调查研究和试验工作,提出在增施有机肥料的基础上,在夏玉米播后35天左右,即相当于夏玉米的拔节一孕穗期间,将全部氮素化肥一次追施,省工省肥并能获得较高产量。此项技术当地称为“一炮轰”施肥法,业已为各地推广采用。 为探索一次追肥的最佳时期和肥效持续时间,以及夏玉米对所追施化肥的利用率,我所于1980年用~N(15)进行了夏玉米吸氮规律试验,1981年又进行了复验,获得一致的结果。 一、试验材料和方法 试验地前茬小麦亩产700～800斤,土壤有机质1.40％,全氮0.08％。夏玉米供试品种均为本所培育的“新单13号”(获白×永白28),生育期约95天,系中熟型。两年里均于6月15日播种,每亩4000株。 同位素(~N(15)H_4)_2SO_4由上海化工研究院提供,
Nitrogen fertilizer application technology, the yield of summer maize has a close relationship. Through years of research and experimental work, I put forward that on the basis of adding organic fertilizers, during the 35 days after sowing of summer maize, that is equivalent to the jointing and booting of summer maize, Provincial labor savings and access to higher yields. This technique is locally known as “a shelling” fertilization method, has been promoted for use throughout. In order to explore the best period of fertilizer and fertilizer duration, as well as summer maize on fertilizer utilization rate, I used N ~ (15) in 1980 to carry out summer maize nitrogen absorption test, in 1981 Retest, get the same result. First, the test materials and methods to test the previous crop of 70000 kg per mu of wheat, soil organic matter 1.40%, total nitrogen 0.08%. Summer corn varieties tested are cultivated by the “new single 13” (by white × Yong Bai 28), the growth period of about 95 days, the Department of cooked. Two years were June 15 sown, 4000 per acre. Isotope (~ N (15) H_4) _2SO_4 provided by the Shanghai Chemical Industry Research Institute,