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三麦是上海郊区的主要粮食作物之一,常年种植面积200多万亩,约占粮食播种面积的三分之一,正常年份产量占全年粮食总产量的五分之一,灾害年份只占十分之一左右。产量不稳,除了气候及栽培管理外,也与前些年氮化肥使用不够合理有关。如1975年以来,三麦全市平均每亩用氮化肥折合碳铵达180斤左右,造成产量不稳,经济效益下降,还影响了全年用肥计划。因此,研究郊区三麦合理施用氮肥,对稳产高产,降低农本,增加收益和保证水稻及其他作物的用
Sanmai, one of the main food crops in the suburbs of Shanghai, has a perennial acreage of more than 2 million mu, accounting for about one third of the sown area of grain. The output of normal years accounts for one fifth of the total grain output of the year, One tenth or so. Output instability, in addition to climate and cultivation management, but also with the use of nitrogen fertilizer in previous years is not reasonable enough. Since 1975, Sanmai has averaged about 180 kilos of ammonium bicarbonate per acre to produce ammonium bicarbonate, resulting in unstable output and declining economic benefits, which also affected the annual plan for fertilizer use. Therefore, the research on the suburban Sanmai rational application of nitrogen fertilizer, stable and high yield, reduce the cost of agriculture, increase revenue and ensure the use of rice and other crops