Improving Aggregate Stability of Ultisols Using Humic Material Derived from Peat Water

Yulnafatmawita, Yulnafatmawita and Asmar, Asmar and Rendi, Arnev (2014) Improving Aggregate Stability of Ultisols Using Humic Material Derived from Peat Water. In: International Congress on Natural Sciences and Engineering, 7-9 May 2014, Kyoto, Jepang.

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Abstract

Aggregate stability of a soil determines the susceptibility on degradation. A research about use of peat water as a source of humic material (HM) was aimed to improve aggregate stability of Ultisol. The peat water was extracted for the HM, and then incubated with Ultisol for 3 months. The parameters analyzed were soil texture, bulk density (BD), total pore (TP) and pore size distribution (PSD), soil organic carbon (SOC), aggregate stabiity index, as well as selected chemical properties (pH, cation exchange capacity [CEC], and Al-exchangeable). The results showed that SOC significantly increased by 4%, 13%, 19%, and 26% as well as the aggregate stability index by 8%, 12%, 17%, and 24%, respectively as increasing humic matter applied from 0 to 100 ppm, 200 ppm, 300 ppm, and 400 ppm. However, there was no significant difference as the incubation time increased from 1 to 2 and 3 months. There was a tendency of increasing soil pH and CEC as increase in HM applied until 400 ppm, but the values were not significant to the control after 3 months. While Al-exchangeable and Al-saturated as well significantly decreased by 400 ppm HM applied.

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