Effect of organic matter on the charge and phosphate adsorption characteristics of kikuyu red clay from kenya |
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| Authors: | AO Moshi A Wild DJ Greenland |
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| Institution: | Department of Soil Science, The University, Reading Great Britain |
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| Abstract: | Two profiles from Muguga, Kenya, one cultivated and one under forest, contained similar contents of clay of apparently uniform composition. The profiles differed in their organic matter contents, surface (0–15 cm) samples containing 6.8% C and 3.8% C in forest and cultivated profiles, respectively. In both profiles the amounts of organic matter decreased with depth.The positive charge, measured at pH 4 in 0.2M NH4 Cl, increased down the cultivated profile to 3.6 me/100 g at 90–120 cm. The charge was lower in the forest profile at equivalent depths, and at 90–120 cm the value was 1.2 me/100 g. Phosphate adsorption measured at pH 5 was also higher in the cultivated profile. The amount of phosphate required to raise the solution concentration to 0.2 p.p.m., ΔP, was 45 and 11 mg/kg in the surface horizon (0–15 cm) of the cultivated and forest profiles, respectively, and increased in both profiles with depth of sample.The differences between, and within, the two profiles are largely attributed to the blocking of positively charged sites and phosphate adsorption sites by organic matter. |
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