Changes in solid phase properties of acid soils as affected by limestone, gypsum, palm oil mill effluent and rock phosphate applications
1992
Shamshuddin, J. | Jamilah, I. | Sharifuddin, H.A.H. | Bell, L.C. (Pertanian Malaysia Univ., Serdang, Selangor Darul Ehsan (Malaysia). Faculty of Agriculture. Dept. of Soil Science)
Utisols and oxisols in Malaysia are dominated by kaolinite and sesquioxides, which are characterized by high Al saturation, low ECEC and Ca and/or Mg deficiencies. These acid soil infertility factors are limiting to annual crop production on the soils. A pot experiment was conducted to investigate the chemical changes in solid phase properties of some Malaysian utisols and oxisols affected by limestone, gypsum, palm oil mill effluent and rock phosphate applications. Results obtained showed that the negative charge on the clay surface of the untreated samples increased with an increase in soil pH. Limestone, palm oil mill effluent and rock phosphate applications increased soil pH, resulting in an increase in CEC (Cation exchange capacities) gram, The CEC gram in the palm oil mill effluent treatment was further increased by an increase in the soil solution ionic strength and by the protonation of carboxyl and/or hydroxyl groups present in the organic matter. Exchangeable Ca and Mg increased, while exchangeable Al decreased significantly after palm oil mill effluent and limestone applications. It was observed that exchangeable K was reduced by gypsum and rock phosphate applcations
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