Agricultural Reviews, volume 27 issue 4 (december 2006) : 276 - 283
EXPLOITING THE NATURAL RESOURCE - LIGNITE HUMIC ACID IN AGRICULTURE - A REVIEW
K. Kalaichelvi, C. Chinnusamyl, A. Arul Swaminathan2
1Department of Agronomy,
Tamil Nadu Agricultural University, COimbatore - 641 003, Tamil Nadu, India