无土栽培基质速效钾测定方法的比较

The comparison of determination methods involving available K in substrates of soilless culture

将4种土壤速效钾测定方法用于无土栽培基质中速效钾的测定,测定结果经统计分析表明,2 mol.L-1冷HNO3、Mehlich3和ASI 3种方法与1mol.L-1中性NH4OAc法测定的速效钾存在极显著的相关性,并且在显著水平α=0.05,ASI法与Mehlich3法的速效钾测定结果没有显著性差异。这两种方法都可以用于无土栽培基质速效钾的测定。

Abstract： available K in substrates of soilless culture. The determination results were statistically analyzed. The result showed that the contents of available K determined by 2 mol · L- 1 cold HNO3 method, Mehlich3 method and ASI method were highly significant correlation with determined by 1 mol· L-1 neutral NH4OAc method. At α =0. 05 significant level, there were not significant different between ASI - K and Mehlich3 - K. The ASI method and Mehlich3 method could be used to determinate available K in substrates of soilless culture.