论文部分内容阅读
尿素是目前农村固体氮肥中含氮最高的优质化肥,含氮46％,易溶于水,肥效快,是化学中性和生理中性肥料。目前尿素的价格较高,为了经济用肥,提高尿素化肥的利用率,降低小麦成本,麦田施用尿素要注意如下“七要”“四忌”。一、要掌握好用量尿素施用量过大时,首先土壤溶液中的尿素浓度较高。浓度高时能破坏种子内部的蛋白质结构,使蛋白质变性和变质,影响小麦种子的发芽和幼苗的生长,情况严重时可使小麦种子失去发芽能力。其次,会发生强烈的氨化作用,7天后有大量的氨态氮积累,直接危害小麦种子和幼苗。再次,
Urea is currently the highest quality nitrogen fertilizer in rural solid nitrogen fertilizers, 46% nitrogen, soluble in water, fertilizer fast, is neutral and neutral chemical fertilizers. The current price of urea is higher, in order to economic fertilizer, urea fertilizer to improve utilization and reduce wheat costs, the use of urea in wheat fields should pay attention to the following “seven to” “four bogey.” First, to master the amount of urea application is too large, the first high concentration of urea in soil solution. High concentrations can destroy the internal protein structure of the seed, the protein denaturation and deterioration, affecting the germination of wheat seeds and seedling growth, serious cases can lose the germination capacity of wheat seeds. Second, a strong ammoniation occurs. After 7 days, a large amount of ammonia nitrogen accumulates, directly damaging wheat seeds and seedlings. once again,