长效尿素是氮肥新品种。通过1989、1990两年试验和大面积施用调查,发现长效尿素与普通尿素相比可抑制脲酶活性五十天左右,在施用前期,土壤脲酶活性低于对照区,尿素残余量高于对照,后期则相反,作物的叶绿素和氨基酸总量增加;增产效果明显,亩增产玉米40公斤,大豆10公斤,甜菜150公斤,亩纯增益分别为14.8,18.8和16.8元,经济效益显著。 Long-acting urea is a new nitrogen fertilizer. Through the test of 1989 and 1990 and large-area application survey, it was found that the long-acting urea can inhibit the urease activity for about 50 days compared with the ordinary urea. In the pre-application period, the soil urease activity is lower than the control area, the residual amount of urea is higher than the control, On the contrary, the total amount of chlorophyll and amino acid in the crop increased in the later period. The effect of increasing yield was obvious. Acreage increased 40 kg of corn, 10 kg of soybean and 150 kg of sugar beet. The net gains of mu were 14.8, 18.8 and 16.8 yuan, respectively.