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国内外研究资料表明,磷肥的当季利用率很低,一般只有5—25%,土壤对磷的固定、吸附作用相当大.磷肥的反应取决于土壤性质,如pH、游离铁、活性铝、水分、质地、碳酸钙、有机质等等.因此,研究土壤供磷的数量、容量、强度、固磷力对磷肥利用率的影响,及其与作物产量和吸磷量的关系,可为评价土壤磷素肥力和合理施用磷肥提供依据.一、试验方法采集江苏省淮阴地区有代表性的五种土壤,进行盆栽试验和室内测定.其基本性状如表1.土壤经风干搓碎,拣取根茬,按每份3公斤装入15×20厘米的
Domestic and foreign research data show that seasonal utilization of phosphate fertilizer is very low, generally only 5-25%, soil fixation of phosphorus, adsorption is quite large.Phosphate fertilizer reaction depends on the nature of the soil, such as pH, free iron, activated aluminum, Soil moisture, texture, calcium carbonate, organic matter, etc. Therefore, it is of great significance to study the relationship between quantity, capacity and intensity of phosphorus supply, phosphorus utilization rate and its relationship with crop yield and P uptake, Phosphorus fertility and rational use of phosphate fertilizer to provide the basis for a test method collected in Huaiyin, Jiangsu Province, representative of the five kinds of soil for pot experiment and indoor determination of its basic characteristics in Table 1. Soil by air-drying graze pick roots Crop, according to each 3 kg into 15 × 20 cm