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增施化肥是人类有效控制作物生长,获得粮食高产的重要手段。化肥对灌溉农业的均衡增产是毫无疑义的。但在干旱十分严重的定西地区,化学肥料往往由于施用技术不当,不能充分发挥增产效益。该区80％的耕地属雨养农业,年降雨量仅有250—500毫米,且多集中于七、八、九三个月。而春小麦生长季节,干旱缺水,墒情不足,不但直接威胁作物生长,而且也影响了化肥肥效的发挥。为了探索干旱地区合理施用化肥的科学依据,发挥化肥在旱
Fertilizer application is an important means for mankind to effectively control crop growth and obtain high yield of grain. There is no doubt about the balanced increase of fertilizers on irrigated agriculture. However, in the Dingxi area where the drought is very serious, chemical fertilizers often fail to give full play to yield benefits due to improper application techniques. Eighty percent of the arable land in this area is rainfed agriculture with an annual rainfall of only 250-500 millimeters, mostly concentrated in seven, eight and ninety-three months. The spring wheat growing season, drought and lack of water, lack of moisture, not only a direct threat to crop growth, but also affect the fertilization of fertilizer to play. In order to explore the scientific basis for the rational application of fertilizers in arid regions, to play a role in fertilizer in drought