Husnain, Husnain; Balai Penelitian Tanah, Jl. Tentara Pelajar No. 12, Bogor 16114; Nursyamsi, Dedi; Balai Besar Litbang Sumberdaya Lahan Pertanian, Jl. Tentara Pelajar No. 12, Bogor 16114 (Indonesian Center for Agriculture Land Resource Development, 2014-07-05)