EFEK RESIDU ABU VULKANIK KELUD DAN BAHAN ORGANIK TERHADAP KETERSEDIAAN DAN KADAR MAGNESIUM PADA JAGUNG DI TANAH ALFISOL

EFEK RESIDU ABU VULKANIK KELUD DAN BAHAN ORGANIK TERHADAP KETERSEDIAAN DAN KADAR MAGNESIUM PADA JAGUNG DI TANAH ALFISOL

Oleh: Suntoro, Hery Widijanto, Aziz Syaffifuddin

Universitas Sebelas Maret

Contact Author: Suntoro_uns@yahoo.com

ABSTRACT

New Kelud volcanic ash will have negative effects on crops. After incubated in a certain period, Kelud volcanic ash will mineralized so thus nutrients become available to plants. This study aimed to determine the effects of Kelud volcanic ash residues and organic matter to the availability and magnesium contents in maize on the Alfisols. This study was conducted in a greenhouse using a completely randomized design with two factors. The first factor is the thickness of the Kelud volcanic ash (0, 2, 4, and 6 cm), while the second factor is the dose of cow manure (0; 2.5; and 5 ton ha-1), this treatment was repeated 3 times. The results of this study showed that these treatment combinations kelud volcanic ash residues and organic matter effect on Magnesium availability but didn’t affect on other variable. The thickness of Kelud volcanic ash effect magnesium contents in the plant tissue, soil pH, CEC, and chlorophyll, whereas the dose of cow manure didn’t effect to all variables.

Keywords: kelud volcanic ash, cow manure, alfisols