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acidic soils added Agricultural alfalfa Alfisols aluminum ammonium amount anaerobic application areas bacteria boron calcium carbon cation exchange cation exchange capacity cause chemical clay climates compost corn crops decomposed decomposition deficiency depth drainage drained erosion fertilizer field fungi gypsum hectare Histosols horizon humus Inceptisols increase ions iron irrigation water kaolinite kg/ha land layer lb/a leaching legumes levels lime loam losses magnesium manganese manures materials microbes mineral moisture Mollisols molybdenum montmorillonite mycorrhizae needed nitrate nitrogen nutrients organic matter organic soils oxides Oxisols oxygen particles percent percentage phosphate phosphorus plant growth pores potassium problem produce rainfall reduced require residues rice saline sample sand sandy saturation slope sludge soil pH Soil Science soil surface soil tests soluble soluble salts solution Source sulfate sulfur Table temperature texture tillage tion toxic tropical Ultisols United urea usually values Vertisols yields zinc