Impact of agriculture on chemical properties of soils on basalt from Mindanao, the Philippines
1997
Van Ranst, E. | Boniao, R. | Shamshuddin Jusop | Baert, G.
Uncultivated and cultivated soils from Mindanao, the Philippines were sampled and studied to determine the impact of agriculture on their chemical properties. The results of the study showed that cultivated soils, having lost some organic matter due to oxidation, have a lower CEC and a higher point of zero charge (pHo)' For these soils, the capacity to retain cations has decreased to a certain extent. In the subsoils of both the soil types, there is a tendency for the soil pH to coincide with pHo' reflecting development of positive charge in the soil of that zone. The sum of exchangeable bases and Al (ECEC) is found to be a good estimate of the CEC of the soils.
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