摘要
土壤水分含量是影响氨肥吸收与损失的主要因素之一。本文采用￣１５Ｎ示踪方法，研究麦田土壤水分条件对肥料氮（￣（１５）Ｎ）的吸收、淋溶，损失的影响。结果表明，土壤供水条件在一定范围内（１８０～３６０ｍｍ水），氨素的损失与施肥量成正比，其氨素利用率与施肥量成反比。低肥处理的氨素利用率均高于高肥处理的氨素利用率，其顺序为７５ｋｇＮ／ｈａ＞２２５ｋｇＮ／ｈａ，其中，７５ｋｇＮ／ｈ的处理，氨素利用率变幅为１７．９％～３０．５％。
Concerning with applied nitrogen fertilizer,the uptake as well as loss of nitrogen ismainly related to soil water content. The effects of soil water condition in wheat field on theuptake, leach and loss of nitrogen fertilizer were studied in this paper using 15N tracing tech-nique. The results showed that within certain range of soil water supply, from 180 to 360mmof available water storage, the loss of nitrogen was in direct proportlon to the amount of fer-tilizer application and the nitrogen use efficlency decreased with the increase of nitrogen ap-plication. In other words, the nitrogen use efficiency descended with the nitrogen applicationinreased in an order of 75 kgN/ha , 150 kgN/ha,225 kgN/ha. One interesting result wasthat the nitrogen use efficiencies ranged from 17.9%to 30.5%for the treatments receivingthe same appllcation rate of 75 kgN/ha.
出处
《核农学报》
CAS
CSCD
1996年第1期43-46,共4页
Journal of Nuclear Agricultural Sciences
关键词
土壤水分
￣(15)N
肥料氮
利用率
Soil water,15N tracing techinque, nitrogen , use efficiency
