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Effect ofRhizobium inoculation and the application of phosphate on the growth, yield and nitrogen fixation of soybeans

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Summary

Application of phosphate at 60, 90 and 120 kg P ha−1 to the ‘Bragg’ variety of soybeans inoculated with a mixture of three strains ofRhizobium japonicum (TAL 102 + TAL 377 + TAL 379) and grown in silty loam soil in a pot experiments, significantly improved the number of nodules per plant and increased production of shoots and roots by 65, 36 and 17%, the yield of pods by 38, 12 and 3% and N2-fixing capacity by 57, 29 and 20%, respectively. Rhizobium inoculation alone with the test strains caused a positive but poor nodulation of the crop and increased its dry-matter production of shoots and roots by 22%, pods yield by 7% and N2-fixing capacity by 6%. Soybean plants from uninoculated treatments were without nodules indicating that indigenous rhizobia associated with this crop are absent in the test soil. Phosphate concentration in the total dry matter of mature crop exhibited an increasing tendency as a result of all the applied levels of phosphorus.

Résumé

L'application du phosphate à raison de 60, 90 et 120 kg en phosphore par hectare à la variété Bragg de soja inoculée avec un mélange de 3 souches deRhizobium japonicum (TAL 102, TAL 377 et TAL 379) et cultivée sur un sol gras limoneux dans des expériences en jarre de croissance, a augmenté de manière significative le nombre de nodules par plant et a augmenté la production des pousses et racines respectivement de 65, 36 et 17%, le rendement des cosses respectivement de 38, 12 et 3% ainsi que la capacité de fixer l'azote, respectivement de 57, 29 et 20%. L'inoculation seule avec les souches testées de Rhizobium a causé une nodulation positive mais faible de la plante, et a augmenté la production en matière sèche des racines et pousses de 22%, le rendement en cosses de 7% et la capacité de fixer l'azote de 6%. Les plants de soja dans les expériences sans inoculation ne présentaient pas de nodules, indiquant par là que les rhizobia endogènes associés avec cette plante étaient absents dans le sol expérimental. La concentation en phosphate dans la matière sèche totale de la plante mûre a marqué une tendance à l'augmentation comme suite aux applications du phosphore à tous les niveaux.

Resumen

La adición de fosfato (60, 90, y 120Kg P ha−1) a plantas de soja de la variedad Bragg inoculadas con una mezcla de tres cepas deRhizobium japonicum (TAL 102 + TAL 377 + TAL 379) cultivada en contenedores en un suelo arcillo-limoso, mejoró significativamente el número de nódulos por planta, aumentó la producción de tallos y raíces en un 65, 36 y 17%, el rendimiento de la cosecha en un 38, 12 y 3%, y la capacidad fijadora de N2 en un 57, 29 y 20% respectivamente. La sola inoculación con las cepas deRhizobium ya mencionadas produjo una nodulación positiva aunque pobre del cultivo, incremetando la producción de tallos y raíces en un 22%, el rendimiento de la cosecha en un 7% y la capacidad fijadora de nitrógeno en un 6%. Las plantas de soja de los tratamientos no inoculados no tenían nódulos lo que indica que no habían rizobios específicos para esta planta en el suelo ensayado. La concentración de fosfato en la materia seca de las plantas maduras mostraba una tendencia a incrementarse como resultado de la aplicación de los distintos niveles de fosfato.

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Idris, M., Khan, H. & Fazal-e-Mahmood Effect ofRhizobium inoculation and the application of phosphate on the growth, yield and nitrogen fixation of soybeans. Mircen Journal 4, 215–220 (1988). https://doi.org/10.1007/BF01301950

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