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液氨施肥时大量气态氨进入土壤,形成铵离子为土壤所吸附造成铵浓度较高的集中区域,根据穴施、条施、多行条施等不同情况,这类集中区域可称为铵核或铵带、铵层。以穴施液氨进行试验得出铵核的范围和其中的铵浓度大小随土壤质地、土壤水分状况、pH石灰含量等因素而变化。对多行条施液氨的模拟试验表明:由于铵层位于较深层次,因此与田中明提出的深层层施方法极为相似,具有肥效发挥较表施迟缓,但肥劲长的特性,在种植水稻的条件下,氮素损失率较小(21.0％),作物氮素利用率较高,可达62.8％。
Ammonia fertilization of large amounts of gaseous ammonia into the soil, the formation of ammonium ions adsorbed on the soil caused by a higher concentration of ammonium concentration of the region, according to the hole facilities, facilities, multi-line facilities and other different circumstances, such concentrated area can be called ammonium Or ammonium tape, ammonium layer. Ammonia solution was used to test the range of ammonium nuclei and the concentration of ammonium in the soil texture, soil moisture status, pH, lime content and other factors. Simulated tests on multiple lines of liquid ammonia show that the ammonium layer is located at a deeper level and is therefore similar to the deep layering method proposed by Tian Zhongming and has the characteristics of slow release of fertilizer but long and fat growth, Under the conditions of rice, the nitrogen loss rate is small (21.0%), and the nitrogen utilization rate of crops is high, reaching 62.8%.