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absorbed absorption acid soils acre added addition agricultural Agron alfalfa aluminum ammonia ammonium ammonium nitrate ammonium phosphate ammonium sulfate amount applied areas boron calcium carbon dioxide cations cent chemical chloride clay clover compounds concentration containing copper corn cost decrease deficiency dicalcium phosphate effect exchange factors farm fertilizer materials fixation grower important increase ions iron leaching legumes lime limestone magnesium manganese manure method mineral mixed fertilizers molybdenum neutral nitrate nitrification nitrogen fertilizers organic matter oxide phos phosphate fertilizers phosphorus and potassium placement plant growth plant nutrients Plant Soil potash potassium chloride production quantities reaction residues salts samples seed shown in Figure sodium soil pH Soil Sci soil solution soil test Soils Fertilizers soluble soybeans SSSA Proc subsoil sulfate sulfuric acid superphosphate supply surface Table temperature tion uptake urea water-soluble yield zinc