肥料的施用方法对作物产量有很大影响。深施氮肥一般可以提高肥料利用率,增加作物产量,减少环境污染。大粒状尿素是为解决这一问题而发展的新剂型。据文献报道,大粒状尿素在稻田深施,可以大幅度增加水稻产量和提高氮肥利用率。作者在砂姜黑土地上进行了大粒状尿素和普通尿素施用方法对夏玉米产量影响的试验研究。一、材料和方法田间试验是于1988年在汝南县砂姜黑土地上进行,供试土壤理化性状见表1。田 Fertilizer application methods have a large impact on crop yields. Deep application of nitrogen fertilizer can generally increase fertilizer utilization, increase crop yield and reduce environmental pollution. Large granular urea is to solve this problem and the development of new formulations. According to reports in the literature, large granular urea applied deep in paddy fields, can greatly increase the yield of rice and improve nitrogen utilization. The authors studied the effects of application methods of large granular urea and common urea on summer maize yield on sago green soil. First, materials and methods Field experiments were carried out in Runan County sand Jiang black soil in 1988 for test soil physical and chemical properties in Table 1. field