摘要
尿素施入稻田后迅速水解成ＮＨ＋４，两天后水层ＨＮ＋４Ｎ含量即达峰值，混施脲酶抑制剂后，峰值可推迟１天，峰高降低。１５Ｎ示踪试验表明：ＰＰＤ和ＮＢＰＴ两种抑制剂能明显促进水稻对氮素的吸收，亦提高水稻对尿素氮的利用率，减少损失率，并在一定程度上具有增产效果，尤其是在高氮水平下，效果更为明显，而ＨＱ则较差。稻草的施用对水稻生长有一定的影响，降低了水稻对肥料氮素的吸收，但能提高肥料氮素在土壤中的残留量。
Urea applied to the paddy field rapidly released ammonium(NH + 4)through hydrolysis.The released NH + 4 N usually reached to a maximum value 2 days after the application.The maximum value was found to be lower and delay 1 day when a mixture of urea and urease inhibitors was applied.Based on 15 N tracing in the urea, it was found that the two urease inhibitors,phenylphosphordiamidate(PPD)and N (N buty1)thiophosphoric triamide(NBPT),could enhance the efficiency of urea utilization by rice plants due to more absorption and also stimulated rice growth.The grain yields were higher in the treatments applied with the mixture containing PPD or NBPT, esspecially at high N level,than that in the treatment applied with urea only.However,the urea inhibitor, hydropquinone(HQ), had far less effect than PPD and NBPT in the experiment.The application of rice straw was found to reduce the urea N absorption by rice plants but increase its residue in the soil.
出处
《核农学报》
CAS
CSCD
1997年第3期151-156,共6页
Journal of Nuclear Agricultural Sciences
基金
中国科学院南京土壤研究所土壤圈开放实验室自然科学基金
