摘要
通过室内模拟培养 ,探讨了施用不同氮肥后灌淤土中速效氮的变化规律。试验结果表明 ,施肥后碱解氮出现的高峰期 ,硫酸铵为施肥后的第 2天 ,普通尿素为第 3天 ,大颗粒尿素为第 5天并维持至第 10天。 3种氮肥的共同特点为施肥后 15天左右 ,碱解氮含量迅速降低 ,表明已转化为硝态氮。施硫酸铵后的高氮量只能维持到第 5天 ,普通尿素维持到第 3天 ,而大颗粒尿素可维持到施肥后 10天 ,说明大颗粒尿素氮的分解释放缓慢且持续不断 。
Study on the transformation regularity of quick-acting nitrogen after applying different type of nitrogen fertilizer by means of interior simulant cultivation The results showed that the rush period appearing of quick-acting nitrogen was the second day after applying ammonium sulfate, the third day after applying common urea, the fifth day after applying big granulated urea The rush period can kept to 10 days after using big granulated urea The general characteristic of nitrogen transformation regularity is that the alkali decomposed nitrogen decreased rapidly after applying 3 types of N fertilizer 15 days It showed that ammonium had changed into nitrate The high quantity of applied N only can keep to fifth day after applying ammonium sulfate, to third day after applying common urea and to tenth day after applying big granulated urea This is to say big granulated urea decomposed slowly and continually, which is very good to growth of ammonium-like crops
出处
《宁夏农学院学报》
2003年第1期6-8,共3页
Journal of Ningxia Agricultural College
基金
国家自然科学基金资助 (40 16 10 0 5 )
