Effect of size of water hyacinth waste and CaCO3 on colloid charge characteristics and phosphate release in ultisol soil
1998
Ali, S.A. | Sufardi (Universitas Syiah Kuala, Banda Aceh (Indonesia). Fakultas Pertanian)
Adsorption of calcium (Ca++) on surface oxides and humus of variable charge soils will influence the status of point of zero charge. Laboratory experiment was conducted to study the effects of size of water hyacinth and dosage of CaCO3 on colloid charge characteristics and phosphate release in Ultisol soil. Factorial experiment of 4x3 was arranged in completely randomized design with three replications using Typic Paleudults soil from 0-25 cm depth. The first factor consist of four levels of water hyacinth waste sizes (0.5 mm, 0.5-1 mm, 1-2 mm and 2-4 mm) which each dosage application of 20 Mg/ha. The second factor consist of three levels of CaCO3 dosages (0, 2 and 4 Mg/ha). The result showed that the CaCO3 application at the sizes of water hyacinth waste could increase the status of point of zero charge (pH) of the soils, followed an increase in soil pH (H2O and KCl) and P-retention. These effects caused the decrease of phosphate release in soil solution. The water hyacinth waste that gave a better effect on colloid charge and P release was obtained at size diameter 0.5-2.0 mm
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