庆阳地区冬小麦播种面积历年为330万亩左右,占全区粮田面积60％以上,但因缺水缺肥,产量低而不稳,平均亩产仅200斤左右。轮作倒茬能够调节土壤水肥条件,是我区小麦增产的主要措施之一,苜蓿则是冬小麦理想的前茬。苜蓿不仅是一种优良牧草,更重要的是可以改良土壤,培肥地力。据测定:种植5—12年的苜蓿地比施肥连作小麦地0—20厘米 The area of ​​winter wheat sown in Qingyang is about 330 million mu over the years, accounting for more than 60% of the total grain crop area. However, due to lack of water and lack of fertilizer, the yield is low and unstable, with an average yield of only about 200 kg per mu. Crop rotation can regulate soil water and fertilizer conditions, is one of the main measures to increase wheat yield in our region, alfalfa is the ideal winter wheat crop. Alfalfa is not only a good forage, but more importantly, it can improve the soil and fertility. It is measured: planted 5-12 years of alfalfa than the fertilizer even wheat 0-20 cm