"Effect of nitrogenous fertilizers on soil acidity. "; "Pierre, W. H. (William Henry), 1898-"; "Soil acidity.", "Nitrogen fertilizers."; "Pierre, W. H. (William Henry), 1898-"; "1931"; "Journal article reprint from: Industrial and Engineering Chemistry, v.23 (1931:Dec.). "; ""; "P17000"; "pec"; "Nitrogen fertilizers.", "Soil acidity."; "14256"; .