论文部分内容阅读
小麦是我区主要作物,单产不高,水地小麦平均单产只是(?)00斤左右。尿素是主要氮肥,肥效不高,每斤尿素平均增产小麦约3—5斤。折合每斤氮素增产6.5—11斤,氮素利用率约20—30%,施用尿素提高单产作用不大,增加收入也不多,有时比上述增产效果还低,增产不增收,成为我区农业生产上一个突出问题。一:国内外水平,每斤氮素增产多少斤粮食?国际上肥料研究结果,认为氮肥中氮素利用率约为50—
Wheat is the main crop of our region, yield is not high, the average yield of wheat in water is only about (?) 00 pounds. Urea is the main nitrogen fertilizer, fertilizer efficiency is not high, the average yield of wheat per kilogram of wheat about 3-5 pounds. Equivalent to 6.5-11 kg of nitrogen per kilogram yield, nitrogen utilization rate of about 20-30%, Urea application of urea to enhance yield is small, increasing income is not much, and sometimes lower than the above yield increase, increase production does not increase income, become my area A prominent problem in agricultural production. A: At the domestic and international levels, how many pounds of nitrogen per kilogram of grain yield increase? According to the international fertilizer research results, the nitrogen utilization rate in nitrogenous fertilizer is about 50-