华北农田土壤氨挥发原位测定研究

In situ determination of ammonia volatilization in field of North China

通过系数矫正后的双层海绵吸收法对不同N肥处理和NPK配施下氨气挥发损失特征研究结果表明，N肥施用方式、土壤温度以及灌溉是影响氨挥发的重要因素。施肥后氨挥发损失量为0．67～9．91kg／hm^2，占施N量的0．41％～5．0％。玉米季氨挥发量占全年挥发损失的80％以上。尿素与过磷酸钙配施可显著降低氨挥发，在此基础上施用KCI，尿素氨挥发损失变化不明显。

By the double-layer-sponge-trapping method rectified, the ammonia volatilization was measured after applying different nitrogen fertilizers or those with phosphor or potassium fertilizer. The results show that ammonia volatilization is affected greatly by the application method of N fertilizer, temperature of soil and irrigation. The loss of ammonia volatilization is in a range from 0.67 to 9.91 kg/hm^2 ,accounting for 0.41% -5.0% of total N amount applied,of which the majority occurs in summer maize seasons（above 80 % ）. Ammonia volatilization is reduced greatly when the urea is mixed with TCP, while it does not change obviously after adding potassium fertilizer.