稻田脲酶抑制剂的应用效果及其与环境条件的关系

Effectiveness of Urease Inhibitors Related to Enviromental Factors in Paddy Field

施用脲酶抑制剂可以抑制土壤中脲酶活性,延缓尿素水解速率,从而达到调控氮素,提高氮素利用效率的目的。为了提高脲酶抑制剂的应用效果和完善配套施用技术,我们于1988～1990年对几种抑制剂在不同环境条件下的施用效果进行了室内模拟试验和田间应用效果的初步研究。

The effect of urease inhibitors, PPD, NBPT, HQ, were studied in laboratory and field on different soil under oxidized and reduced conditions, different temperature condition, and different rate of rice straw incorporated to soil. The effectiveness of PPD was the highest among 3 inhibitors, fol- lowed by NBPT. The rate of urea hydrolysis was found in the descending order of 35℃, 25℃, 45℃, 15℃. Rate of urea hydrolysis raised with increase of straw incorporated to soil, and approached to the maximum when the rate of rice straw at 3 mg/g soil. In a field experiment, the amendment of NBPT in- crease the recovery of Urea-N in rice plants and grain yield by 2.60%-7.52% and 5.70%-10.60% com- pared with the control, respectively.