化肥秋施是雨养农业的有效措施,已被大量试验数据和生产实践所证实。但在固原如施肥过大,不仅经济效益降低,而且常因干旱土壤水份亏缺,导致土壤水势降低,根系吸水困难,或使作物贪青晚熟,倒伏减产。如用量过少则效益不明显。为了摸清固原一般干旱区春小麦的化肥最适用量,提高 Fertilizer Qiu Shi rain is an effective measure to support agriculture, has been a large number of test data and production practices have confirmed. However, if the fertilization is too heavy in Guyuan, not only the economic benefits are reduced, but also often the water deficit of the arid soil leads to the decrease of the soil water potential, the difficulty of water absorption in the root system, or the late blooming and late blooming of the crops. If the amount is too small then the benefit is not obvious. In order to find out the most suitable fertilizer for spring wheat in Guyuan general arid area, increase