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Long-Term Effects of Urea and Green Manure on Rice Yields and Nitrogen Balance

^a W. Ventura, Crop, Soil and Water Sciences Division, IRRI, MCPO Box 3127, 1271 Makati City, Philippines
^b Social Sciences Division, IRRI, Muscle Shoals, AL USA
^c International Fertilizer Development Center, P.O. Box 2040, Muscle Shoals, AL USA
^d 6-58-18, Jindaiji-Kita, Chofu-shi, Tokyo, 182-0011, Japan

View larger version (25K): [in a new window]   Fig. 1 Rice yield trends in the double-crop system of the long-term biofertilizer experiments conducted at the IRRI research farm. Since N input and solar radiation changed during the experiment, the regression lines are plotted holding N input and solar radiation constant over time at their mean levels in each treatment. See Table 4 for regression coefficients

View larger version (19K): [in a new window]   Fig. 2 Total soil N of the long-term biofertilizer plots after 7, 16, 20, and 27 rice crops