吉林省自城市从1983年连续5年采用氮肥做底肥一次施入的施肥方法,增产效果十分显著。为了验证在北方干旱条件下,氮肥一次底施还是分次追肥好,我们于1988～1989年又连续两年搞了氮肥施用方法试验,试验所用磷、钾肥均做底肥于播种前一次施入,氮肥分4种施用方法:①做底肥播种前一次施 Since the city of Jilin Province from 1983 for 5 consecutive years using nitrogen fertilizer as a fertilizer applied once, increase yield is very significant. In order to verify that under the condition of drought in the north, whether nitrogenous fertilizer is applied at the bottom or topdressing well in succession, we conducted the experiment of nitrogenous fertilizer application for two consecutive years from 1988 to 1989. The phosphorus and potassium fertilizers used in the experiment were applied before sowing, Nitrogen Fertilizer 4 kinds of application methods: ① to do before the end of planting fertilizer applied