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Determinants of irrigated rice yield were studied in 45 rice fields in the Senegal River valley during 2 years in both wet and dry growing seasons. Grain yields were highly variable, ranging from 0 to 9.5 tha -1 , with an average yield over years and seasons of 5 tha -1 , indicating an average yield gap of about 4-5 tha -1 between actual farmers' yields and potential...
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