黄绵土是甘肃黄土地区的主要土壤类型,其分布区气候干旱,土壤瘠薄,耕作粗放,水土流失严重,大部进行旱作农业,粮食产量低而不稳。建国以来,这一地区化肥用量逐年增加,但经济效益却有下降趋势。为了确定磷二铵在干旱地区黄绵土的增产效益和种肥最佳施尉量,经过多年调查访问,并于1984—1986年进行了此项试验研究。 Loess soil is the main soil type in the loess area of ​​Gansu. Its distribution area is arid, poorly soiled, extensive farming, soil erosion is serious, mostly dry farming, low and unstable grain yield. Since the founding of the People’s Republic, the amount of chemical fertilizers in this area has been increasing year by year, but the economic benefits have been declining. In order to determine the yield-increasing benefit of loessial soils in arid areas and the best application of fertilizers for fertilizers, after many years of investigation and investigation, this pilot study was conducted in 1984-1986.