长效尿素是由普通尿素与脲酶抑制剂按一定比例混拌而成。其原理是:脲酶抑制剂能适当地抑制土壤中脲酶的活性,以减缓对尿素的分解,使其分解释放的时间延长,进而达到延长和提高肥效作用。据有关资料,尿素和脲酶抑制剂按50:1的比例混合后,其肥效期由40～60天延长到100～130天,利用率由45%～50%高到60%～75%。作物增产率为15%左右。我们从1988年开始连续五年进行了长效尿素在 Long-acting urea is a mixture of ordinary urea and urease inhibitors by a certain percentage. The principle is: Urease inhibitors can properly inhibit urease activity in the soil, in order to slow down the decomposition of urea, to extend the time of decomposition and release, and thus to extend and improve fertilizer effect. According to the data, urea and urease inhibitors by 50: 1 ratio of mixing, the fertilizer effect from 40 to 60 days to extend to 100 to 130 days, the utilization rate from 45% to 50% to 60% to 75%. The rate of crop increase is about 15%. We have been carrying out long-term urea in five consecutive years since 1988