Figure 4From: Vermiculite’s strong buffer capacity renders it unsuitable for studies of acidity on soybean (Glycine max L.) nodulation and growthThe change of pH value of vermiculite medium over the period of soybean growth. The pH was measured based on a 1:2.5 (v/v) suspension in water. B: B&D nutrient solution; H: Herridge nutrient solution; 7: pH 7.0; 4: pH 4.0; +: +MES buffer; -: no MES buffer addition. The data are expressed as means and SD of three replications.Back to article page