Studies were made for eight methods of extracting available Mn from three calcareons soils which received MnSO₄ at 5 rates to evaluate their correlations with Mn uptake of plants,their abilities to eztract amounts of applied Mn,and their applieabilities to atomic absorgtion spectrography.The influences of the duration of plant growth and air drvine of soil samples on soil tests were also srtudied.Of the eight methods investigated,the extraction of soil Mn with 1 N NH₄Ac+0.2% hydroquinone at pH 7.0 can well indicate plant available Mn status of the soil.All the other methods,i.e.DTPA+CaCl₂+TEA at pH 7.3,DTPA+CaCl₂+TEA at pH 8.5,EDTA at pH 7.0,EDTA+(NH₄)₂CO₃ at pH 8.5,EDTA+(NH₄)₂CO₃ at pH 9.3,1M NH₄H₂PO₄ and 1N NH₄ Ac at pH 7.0 are unsuitable for estimating plant available Mn in calcareous soils.Multiple regression analysis which involves eatraction of soil Mn with NH₄ Ac+hydroquinone and several soil factors demonstrated that in given cultural conditions,inclusion of soil CaCO₃ of organic matter in the equation can improve Mn uptake predietability.