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石家庄污灌区处于本市东南郊和栾城县西北部,总面积二十余万亩,已有25年的污灌历史。全区位于河北省中南部,滹沱河冲积平原上。土壤多为发育在黄土性洪积物母质上的潮黄垆土(耕作草甸褐土),化学性质为石灰性,质地为轻壤至中壤,土层较深厚。土壤较肥沃,全氮、有机质和速效磷含量均较清灌区高。由于本区地处城市近郊,又使用城市污水(包括工业废水和生活污水)进行灌溉,所以氮肥供应比较充足。在此情况下,无疑磷素就形成了影响作物产量的重要肥力指标。磷素在土壤中的有效性不仅和全磷含量有关,更重要
Shijiazhuang sewage irrigation area is located in the southeastern suburbs of the city and northwest of Luancheng County, with a total area of more than 200,000 mu and 25 years of sewage irrigation history. The region is located in central and southern Hebei Province, Hutuo River alluvial plain. The soil is mostly tidal yellow soil (tillage meadow cinnamon soil) developed on the loamy alluvial material, with chemical properties of calcareous texture, light soil to medium soil texture and deep soil layer. Soil is more fertile, total nitrogen, organic matter and available P content than irrigation area. As the area is located in the suburbs of cities, but also the use of urban sewage (including industrial wastewater and domestic sewage) for irrigation, nitrogen supply more adequate. Under these circumstances, there is no doubt that phosphorus forms an important indicator of fertility that affects crop yields. The effectiveness of phosphorus in the soil is not only related to total phosphorus but more important