ASI法测定土壤有效磷、有效钾和铵态氮与我国常规分析方法的相关性

用ASI法测定了土壤有效磷、有效钾和铵态氮，并与我国常规分析方法进行了相关性研究。结果表明：（1）ASI—P与Olsen—P呈极显著正相关，其相关系数在水作条件下比旱作条件下高，在酸性条件下比中、碱性条件下高，随着土壤pH值升高，两者的相关系数迅速降低；（2）ASI—K与NH4OAc—K呈极显著正相关，其相关系数在旱作条件下比水作条件下高，在碱性条件下比中、酸性条件下高，且对pH值和水分条件的变化均较敏感；（3）ASI—N比碱解N低得多，且在水作条件的中、酸性pH范围相关性较好。

Study on the correlation of ASI and China routine method for soil available P,K and N determination

Soil available P,K and N were determined by both ASI and China routine methods.Results showed that:(1) ASI-P was significant positively correlated with Olsen-P,the correlation co-efficient was respectively higher in paddy soils and acid soils than in upland and neutral or alkalic soils.(2) ASI-K was significant positively correlated with NH4OAc-K,and the correlation co-efficient was respectively higher in upland and neutral or alkalic soils than in paddy soils and acid soils.(3) ASI-N was much lower than alkaline hydrolysis nitrogen.The correlation co-efficient between them was relatively higher in paddy and acid or neutral soils.