JERAPAN FOSFAT DALAM HUBUNGANNYA DENGAN AI DAN Fe AKTIF ANDISOLS DARI SUMATERA BARAT

Fiantis, Dian (2010) JERAPAN FOSFAT DALAM HUBUNGANNYA DENGAN AI DAN Fe AKTIF ANDISOLS DARI SUMATERA BARAT. Working Paper. Fakultas Pertanian. (Unpublished)

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Abstract

Andisols are among the most productive soils in the world but these soils also strongly retained phosphate. The high capacity for phosphate sorptionin andisols is due to their high content of active al and fe compounds. The objectives of this study were assess the effect of soil properties on sorption, buffer capacities and requirements of some benchmark soil profikles in mt. Marapi and mt. Pasaman. The P sortion characteristics of andisols from west Sumatra were described using Langmuir and freudlich equations. The P sorption maximum in Mt. Pasaman soils is hingher than in mt. Marapi soils. The most important soil properties affecting P sorption and buffer capacities were oxalate si and fe, and Al (Si o Feo and Alo), dithionite Al (Ald), Pyrophosphate Al (Alp) , Which explanined 89% of the variance in sorption maxima and 83% of P buffering indices. Allophane, alo and Alo and Ald are positively correlated with P sorption maximum. Contrary to general assumption that organic matter has an inverse relation with P sorption maxima, in this study, however, there is no trend observed between P sorption maxima and organic carbon. Organic C has poor relationship with this parameter. Andisols from mt. Marapi and MT. Pasaman need P input between 320 to 7,800 Mg P kg –1 to maqintain the P level in soil solution at o.2 mg kg –1.

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