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一般地说,氮源分为三类:(1)快速释放,水溶性氮源;(2)缓释,表面包衣;(3)控制释放反应源。这三种氮源可以单独使用也可混合使用。了解每种氮源并掌握它们的益处和缺陷,草坪管理人员才能做出准确的施肥计划。 1.快速释放,水溶性氮源(尿素、磷酸铵、硫酸铵、硝酸钾)是目前应用最广泛的氮源,成本低,易溶,易吸收,快速起作用。但容易淋失,残余时间短,一般不超过4-5周。同时施用过量易造成叶部灼伤。
In general, nitrogen sources fall into three categories: (1) rapid release, water-soluble nitrogen sources; (2) sustained release, surface coating; and (3) controlled release of the reaction source. These three nitrogen sources can be used alone or in combination. Knowing each nitrogen source and grasping their benefits and pitfalls allows lawn managers to make accurate fertilization schedules. 1. Rapid release, water-soluble nitrogen sources (urea, ammonium phosphate, ammonium sulfate, potassium nitrate) is the most widely used nitrogen source, low cost, soluble, easily absorbed, fast acting. But easy to leaching, the residual time is short, usually no more than 4-5 weeks. At the same time excessive use of leaves can cause burns.