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Nitrogen fixation in a Mexican coffee plantation . Plant and Soil 67 : 283–291 . Sánchez , P.A. , C.A. Palson , C.B. Dabey , L.T. Szott , and C.E. Russell , 1985 . Tree crops as soil improvers in the humid tropics ? | |
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Nitrogen fixation in a Mexican coffee plantation . Plant and Soil 67 : 283–291 . Sánchez , P.A. , C.A. Palson , C.B. Dabey , L.T. Szott , and C.E. Russell , 1985 . Tree crops as soil improvers in the humid tropics ? | |
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