Among the organic materials tested, cowpea (Vigna unguileata) was superior with respect to mineral composition, followed by dhaincha (Sesbania aculeata) and azolla. The grain yield response clearly demonstrated that cowpea was the best source of organic material for wetland rice, followed by dhaincha (Bhuiyan, 2001). To increase soil organic matter, some farmers are using compost, quick compost, cow dung, and azolla and growing grass pea (Lathyrus sativus) at maturity of Aman rice as a relay crop (Hossain 2001). Recycled rice straw has appeared to be a good supplementary source of K fertilizer in rice cultivation and some nutrient-enriched organic fertilizer (namely, Moni Mukta, Agro-sar, Jaibo-sar, Super Greenfield, Chook-Chook 111) has been evaluated for wetland rice cultivation and has been found effective and could therefore reduce the use of chemical fertilizer (BRRI, 2007). Integrated weed management is also widely practiced in Bangladesh (Ahmed et.al., 2006).