1、依土壤性质科学选用复混肥料北方地区土壤pH值一般为8.0左右,呈微碱性,应选用化学酸性氮磷复混肥料,如腐殖酸类氮磷钾复混肥料、氮磷复混肥料为宜。南方地区土壤pH值一般为4.5～6.0,弱酸性,适于选用高钾高钙的化学碱性复混肥料。2、依作物品种科学选用复混肥料一般大田作物 1, depending on the nature of the scientific selection of compound fertilizers Northern soil pH value is generally about 8.0, was slightly alkaline, should choose chemical and acidic nitrogen and phosphorus compound fertilizer, such as humic acid nitrogen, phosphorus and potassium compound fertilizer, nitrogen and phosphorus complex Mixed fertilizer is appropriate. Soil pH in the South is generally 4.5 ~ 6.0, weak acidity, suitable for use of high potassium and calcium chemical alkaline compound fertilizer. 2, according to the scientific selection of crop varieties compound fertilizer general field crops