Dr. Roland Buresh, a senior soil scientist in the Crop and Environmental Sciences Division of the International Rice Research Institute, gestures while supervising the replanting of rice at IRRI's experimental rice plots at Los Banos, Laguna province 70 kilometers south of Manila, Philippines Saturday May 3, 2008. Dr. Buresh and IRRI is working on better ways to improve rice yields through better soil and water management. Started in 1963, IRRI, is planting the 133rd crop in long term trials in rice plots with zero fertilizer and nitrogen. (AP Photo/Bullit Marquez)

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