Effects of Extraction and Fractionation Period on the Yield of a Tropical Peat Soil (Hemists) Humic Acids

Susilawati Kasim, Osumanu Haruna Ahmed, Nik Muhamad Ab. Majid and Khanif Yusop

American Journal of Agricultural and Biological Sciences 2 ( 3 ): 202 - 205 , 2007