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1.磷肥特性及其与土壤的关系:现在不少农户把磷肥在土壤水分中的溶解性和对作物的有效性混为一谈,以水溶性磷的含量水平衡量磷肥的优劣。实际上,磷肥的肥效和经济效益与土壤性质有密切关系。过磷酸钙、重过磷酸钙属酸性肥料,施在酸性土壤中,既增强了土壤酸度,也不利作物生长发育,而且在酸性土壤中,磷肥中的有效磷也易被土壤中的铁、铝沉淀而形成难溶性磷酸铁和磷酸铝,使肥效降低;施在石灰性或碱性土壤中,过磷酸钙中的有效磷,又易被土壤中的钙、镁固定,变成难溶性磷化物,同样降低肥效。只有在微酸、微碱和中性土壤上才有显著增产效果和经济效益。若在酸
1. Characteristics of phosphate fertilizer and its relationship with soil: Nowadays, many peasants are confused about the solubility of phosphate fertilizer in soil moisture and the effectiveness of crops. The quality of phosphate fertilizer is measured by the content of water-soluble phosphorus. In fact, the fertilizer efficiency and economic benefits of phosphorus and soil properties are closely related. Superphosphate, SSP is an acidic fertilizer, applied in acid soils, not only enhance the soil acidity, but also adverse crop growth and development, and in acid soils, phosphorus in the available phosphorus is also easily affected by soil iron, aluminum Precipitation and the formation of insoluble iron phosphate and aluminum phosphate, so fertilizer efficiency; applied in calcareous or alkaline soil, the available phosphorus in the superphosphate, but also easily by the soil of calcium and magnesium fixed, into insoluble phosphide , Also reduce fertilizer efficiency. Only slightly acidic, slightly alkaline and neutral soil only significant increase yield and economic benefits. If in acid