我国南方地区典型红壤有效磷测定方法研究

通过油菜和水稻的盆栽试验,研究不同耕作方式下红壤有效磷的测定方法。结果表明:不同方法测得的土壤有效磷值差异较大,其中以Olsen法测定的有效磷值最小,各方法测得的土壤有效磷值之间均达到极显著的相关水平;各方法测得的有效磷值与作物吸磷量和生物量的相关性在旱地土壤上均达到极显著水平,在水田土壤上达到显著水平;其中以Bray I法测定的值与作物吸磷量及生长相关性最好,建议将Bray I法作为南方酸性土壤的有效磷测定方法。

Study on methods of determining available phosphorus in red soil of southern China

Pot experiment was carried out to study the methods of determining available P content in the red soils under different tillage methods. The results showed that the contents of available P were different significantly extracted by different methods, and the content of available P determined by Olsen-method was the lowest. The correlation coefficients among the results of available P contents extracted by different methods reached extremely significant level. The correlation coefficients between the reference standards and available P contents extracted by different methods in pot experiments reached extremely significant level in upland soil and significant level in paddy soil. P uptakes by crop and available P contents extracted by Bray-method showed the best correlation, so Bray method is recommended for determining available P content in acid soils of southern China.