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尿素是国内外农业生产中广泛应用的固体氮肥。但尿素易挥发、淋溶,损失较大,利用率仅达45%左右。近年来,国内外学者都竞相研究提高尿素肥料利用率的途径,其中脲酶抑制剂的研究进展较快。该研究的科学原理是,尿素肥料是一种酰胺态氮肥,只有在土壤脲酶的作用下,才能转化为植物可利用的氨态氮。但耕作土壤中脲酶活性很强,施入土壤中的尿素肥效期仅能保持45～60天。如在尿素中加入一定量的脲酶活性抑制剂,可以延缓尿素分解速度,使其释氮速度与吸氮速度同步,就可达到节肥、增产的目的。基于上述原理,中国科学院林业土壤研究所研制出一种长效尿素,1987年第一次引进黑龙江省冷冻的白浆土地区试验,研究其在这类土壤上的使用方法和增产效果。为推广提供科学依据。材料与方法试验地分布在黑龙江省宝清县的852、853两个农场。土地开垦已30年左右。供试作物为玉米和小麦。长效尿素剂型为1、2、3号。亩施用量为5、10、15、20公斤。试验方法有小区试验和大面积示
Urea is a widely used solid nitrogen fertilizer in agricultural production at home and abroad. But urea is volatile, leaching, loss, utilization rate of only about 45%. In recent years, domestic and foreign scholars are racing to study ways to improve the utilization of urea fertilizer, of which urease inhibitors research progress is fast. The scientific rationale for this study is that urea fertilizers are amido nitrogen fertilizers that are converted to ammonium nitrogen that is available to the plant only under the action of soil urease. However, tillage soil urease activity is very strong, urea applied to the soil fertility period can only be maintained for 45 to 60 days. Such as adding a certain amount of urease inhibitors of urease activity, can delay the rate of urea decomposition, nitrogen release rate of its speed and nitrogen synchronization, you can achieve the purpose of fertilizer, increase production. Based on the above principle, the Chinese Academy of Forestry Institute of Forestry developed a long-acting urea, the first time in 1987, the introduction of frozen white soil area in Heilongjiang Province to test its use in this type of soil and yield. To provide a scientific basis for the promotion. Materials and methods were experimentally distributed in 852,853 two farms in Baoqing County, Heilongjiang Province. Land reclamation has been 30 years or so. The test crops were corn and wheat. Long-acting urea dosage form 1,2,3. The amount of mu for the application of 5,10,15,20 kg. Test methods are plot test and a large area show