土壤中植物有效锰的形态分级

用4种方法测定土壤有效态锰含量，并加以比较和评价，从而确定出最优的土壤有效锰测定方法。研究结果表明，采用一种顺序浸提的方法能比较准确地反映土壤的供锰状况，锰组分及其相应浸提剂为易溶态锰(O.05mol／LCa(NO

Fractionation of Soil Manganese Forms to Plant Availability

In order to get the best way to determine soil available Mn, four methods had been done and been compared with each other. The result of experiments indicated that a sequential-extraction procedure could quantitatively estimate those forms of Mn insoils of significance to plant Mn availability. The Mn fractions and their extractants were: readily soluble Mn — 0.05 mol/LCa(NO3)2; weakly adsorbed Mn — pH 8.5, CaDTPA—B4O7; carbonate—bound Mn (calcareous soils)—rapidly extraction with 1.6mol/L HNO3; specifically adsorbed Mn (noncalcareous soils)—0.05 mol/L Cu(NO3)2 in 0.05 mol/L Ca(NO3)2, pH 4.4; and oxideMn—pH 2.0, 0.1 mol/L NH2OH.HC1. It showed from the result of relationship analysis between Mn uptake by pepper in potexperiment and tested soil Mn forms that: readily soluble Mn was the most readily Mn uptake by plant. Multiple regression equationwas given: Mn content in pepper leaves=-14.409+21.658 readily soluble Mn, r=0.993 8**(p≤0.01).