Peranan Asam Oksalat dan Sitrat Terhadap Ketersediaan Fosfat Oxisol

Abstract

Oxisol soil has a high phosphorus sorption, because it is dominated by mineral oxides-hydroxides of Al and Fe. The addition of oxalic acid and citric acid can help dissolve the rock phosphate P. This research was aimed to determine the ability of oxalic acid and citric acid in releasing P in rock phosphate. In addition was to study the interaction between oxalic acid and citric acid with their concentrations of 0 and 25 mM in removing P. This study was performed using a complete randomized factorial design (2x2) with 3 replications. The first factor was the type of acid, oxalic acid and citric acid. While the second factor was the concentration of the acid, 0 and 25 mM. Phosphate deposits used in this study were obtained from Pamekasan, Tuban, Ciamis, and Cileungsi. The soil should be incubated first for 20 and 40 days prior to analysis. The results of this study showed that the interactions between acids and their consentrations dissolved rock phosphate P on all deposits significantly except of Ciamis deposits.