1Master of Soil Science Department, Faculty of Agriculture, Universitas Sebelas Maret, Indonesia. Jl. Ir. Sutami 36 Kentingan. Post code 57126.
2Department of Soil Science, Faculty of Agriculture, Universitas Sebelas Maret, Indonesia. Jl. Ir. Sutami 36 Kentingan. Post code 57126.
Email: mujiyo@staff.uns.ac.id