Present methods of fertilization for the red soils in South China International symposium on distribution, characteristics and utilization of problem soils

abonos agricultural chemicals amendement du sol application methods asia asie china chine climatic soil types composition engrais engrais organique engrais potassique enmiendas del suelo environment environnement fertilizantes fosfatados fertilizantes nitrogenados fertilizers fosfatos inorganic compounds medio ambiente methode methods nitrogen fertilizers organic matter phosphate phosphate fertilizers phosphates potash fertilizers produit agrochimique sales salts sel site factors soil amendments soil types sol tropical suelo tropical tropical soils type de sol type de sol climatique