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农业发达国家,农作物对氮素化肥的利用率可达40%～45%,我国仅为30%.据统计,每年我国仅氮素化肥一项损失就达800多万吨.因此,如何提高氮肥的利用率,成为生产上一个亟待解决的问题.现介绍几种技巧.尿素与草酸混施 据试验,在每公顷土地施用200公斤氮肥、140公斤磷肥、60公斤钾肥的情况下,施用5公斤草酸,可使氮化细菌数量下降63%,固氮菌数量增加4.6倍,可使氮肥的利用率提高17.3%.
Agricultural developed countries, crop utilization of nitrogen fertilizer up to 40% ~ 45%, China is only 30% .According to statistics, each year only a loss of nitrogen fertilizer amounted to more than 8000000 tons.Therefore, how to improve nitrogen fertilizer The utilization rate has become a production of a problem to be solved.Currently introduce several techniques.Urea and oxalic acid mixing test according to the test, the application of 200 kg of nitrogen fertilizer, 140 kg of phosphate fertilizer, 60 kg of potassium fertilizer per hectare of land, the application of 5 kg Oxalic acid can reduce the number of nitrifying bacteria by 63% and the number of azotobacter by 4.6 times, which can increase the utilization rate of nitrogen fertilizer by 17.3%.