Figure 5From: 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 the vermiculite after 1 min to 96 hours shaking of the vermiculite suspension. Initial pH 4.0 and 7.0 (a); initial pH 2.0 and 3.0 (b). 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