尿素是一种高效氮肥,但存在一些有毒物质,对种子发芽有抑制作用。为提高尿素的利用率,1976年我们在八里庄进行了尿素施用方法的试验,结果,追肥最好,基肥次之,种肥最差。试验作物是杂交玉米丹玉七号,设4个处理:1对照.空白;2.基肥,亩施尿素25斤,人工开沟施下,隔土下种;3.种肥,亩施尿素25斤.刨按施下,隔土下种;4.追肥, Urea is an efficient nitrogen fertilizer, but there are some toxic substances that inhibit seed germination. In order to improve urea utilization, we conducted a test of urea application method in Balizhuang in 1976. As a result, top dressing was the best, followed by basal fertilizer, and the worst kind of fertilizer. The test crop is hybrid corn Dan Yu seven, set up four treatments: a control blank. 2 basal fertilizer, 25 kg of urea applied, artificial ditching, under the soil; 3 kinds of fertilizer, acre urea 25 Kg. Planing by the facilities, under the soil species; 4. Top-dressing,