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同心县河西扬黄灌区地处干旱区,1979年开始部分灌溉,逐年扩大,1986年灌溉面积近8万亩,其中小麦4万亩。本灌区地下水位深达20米左右,土壤(底盐灰钙土)十分贫瘠,所以一经灌溉种植培肥,土壤肥力上升较快。小麦(不施肥)地力产量水平开
Hexin Yellow River Irrigation District in Hexin County is located in the arid area. In 1979, it started to partially irrigate and expanded year by year. In 1986, the irrigated area was nearly 80,000 hectares, of which 40,000 hectares were wheat. The groundwater table in this irrigation area is about 20 meters deep. The soil (bottom salt, calcareous soil) is very barren. Therefore, when irrigated and planted, the soil fertility rises rapidly. Wheat (not fertilized) Yield levels open