Response of soil pH and aluminum to ipil-ipil biomass incorporation.
1988
Atiwag J.A. | Edwards D.G.
Organic matter contains reactive carboxyl, phenolic and amino groups which are capable of bonding hydrogen ions. Such hydrogen ion saturated groups behave as a weak acid and the covalently bound hydrogen ions will dissociate when the dissociation constant is reached. A pot experiment was conducted in glass house at the University of Queensland, St. Lucia, Queensland, Australia from August through September of 1985 to determine the effect of ipil-ipil biomass incorporation into an Australian Yellow podzolic soil on soil pH and aluminum. To simulate what was happening to soil pH and aluminum in a natural environment when ipil-ipil was turned over as a green manure, ipil-ipil biomass was incorporated at rates of 0, 10, 20, 30, and 40 t/ha. Soil pH and aluminum were monitored at a predetermined time and it was found that soil pH was increased significantly (P=0.01) by the addition of biomass but the effect was only temporary. The biomass also played a role in controlling the levels of both soluble and exchangeable monomeric and polymeric aluminum. Higher levels of biomass incorporation have a better control of the aluminum in the soil solution but emphasis should be given to monomeric aluminum because recent findings have established that the aluminum phytotoxicity was due to the monomeric aluminum species.
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