Effects of fertilization practices on aluminum fractions and species in a wheat soil

Abstract

Purpose: To better understand the effect of fertilizer practices on soil acidification and soil organic matter (SOM) stocks in a rice-wheat system, a field experiment was conducted to (i) investigate the influence of fertilizer practices on the Al forms in solid phases and the distribution of Al species in water extracts and (ii) explore the relationship between the Al forms, the quantity and composition of SOM, and soil acidity. Materials and methods: Seven fertilizer treatments including CL (no fertilizer), NK, PK, NPK, N2PK (PK and 125 % of N), NP2K (NK and 125 % of P), and organic fertilizer (OF) were applied to induce various changes in pH and SOM composition (i.e., total C and N conten..