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Nodulation, vegetative growth, infestation with the spider miteTetranychus cucurbitacearum (Sayed) and seed yield of N-fertilized soybean plants in the Nile Delta

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Summary

A field experiment was conducted at Sakha Agricultural Research Station, Kafr El-Sheikh, A.R. Egypt, to study the effect of inoculation with the symbiotic N2-fixerRhizobium japonicum on nodulation, vegetative growth and seed yield of soybeans cultivated in Nile Delta clay-loam alluvial soil, with N-fertilization rates of 48, 96, 144 or 192 kg N/ha. Special attention was given to infestation with the spider miteTetranychus cucurbitacearum (Sayed). Soybeans in noninoculated plots failed to nodulate. In the inoculated plots, nodule number and weight, plant dry weight and N-content, seed yield and N-content and weight/100 seeds responded to inoculation plus N-fertilization up to 96 kg N/ha added as one dose 30 days after planting. Inoculation at all levels of applied N gave higher yields than non-inoculation at corresponding N levels. Infestation with the spider miteTetranychus cucurbitacearum over a 10-week period was highest for inoculation with the symbiotic N2-fixer and N-fertilization at 96 kg N/ha, the same treatment which gave the highest N-content in plant vegetative tissue.

Résumé

Une expérimentation sur le terrain a été conduite à la Station de Recherche en Agriculture de Sakha, Egypte, pour étudier l'effect de l'inoculation deRhizobium japonicum sur la nodulation, la croissance végétative et le rendement en graines du soja, cultivé dans un sol alluvial d'argile gras du Delta du Nil, avec un taux de fertilisation respectivement de 48, 96, 144 et 192 kg d'azote par hectare. Une attention particulière a été réservée à l'invasion par la mite araignéeTetranychus cucurbitacearum (Sayed). Les sojas de parcelles non-inoculées n'ont pas développés de nodules. Dans les parcelles inoculées, le nombre et le poids des nodules, le poids sec de la plante et sa teneur en azote, le rendement en graines ainsi que le poids et la teneur en azote par 100 graines ont répondu à l'inoculation plus la fertilisation azotée jusqu'à 96 kg d'azote par hectare et ajouté une dose unique 30 jours après la plantation. L'inoculation à tous les niveaux d'ajouts d'azote a produit des rendements plus élevés que la non-inoculation pour les mêmes taux d'ajout d'azote. L'invasion par la mite araignéeTetranychus cucurbitacearum pendant une période de 10 semaines a été la plus élevée dans le cas de l'inoculation avec le fixateur symbiotique d'azote et la fertilisation azotée à 96 kg par hectare, c'est-à-dire le même traitement que celui qui a résulté en la teneur la plus élevée en azote dans le tissus végétatif végétal.

Resumen

En la Estación de Investigación Agraria de Sakha, Kafr El-Sheik, A.R. Egipto, se estudió el efecto de la inoculación conRhizobium japonicum sobre la nodulación, el crecimiento vegetativo y el rendimiento en semillas, de plantas de soja, cultivadas en un suelo de aluvión, arcillo-limoso, del Delta del Nilo, con las siguientes dosis de abonado nitrogenado: 48, 96, 144 ó 192 kg N/ha. Se prestó especial atención a la infestación por el ácaroTetranychus cucurbitacearum (Sayed). Las plantas de soja de las parcelas no inoculadas no nodularon. En las parcelas inoculadas el número de nódulos y su peso, el peso seco y el contenido en nitrógeno de las plantas, la cosecha de semillas, el contenido en nitrógeno de estas y el peso de 100 semillas respondieron a la inoculación más la fertilización hasta la dosis de 96 kgN/ha añadidos de vez, 30 días después de la siembra. La inoculación incrementó la cosecha respecto al tratamiento no inoculado en todas las dosis de nitrógeno consideradas. La infestación por el ácaroTetranychus cucurbitacearum, observada durante un periodo de 10 semanas, fue máxima para el tratamiento inoculado con dosis de abonado de 96 KgN/ha, que fue así mismo el tratamiento que dió mayor contenido en N del tejido vegetativo de la planta.

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Yanni, Y.G., El-Beheiry, M.M. & Hoda, F.M. Nodulation, vegetative growth, infestation with the spider miteTetranychus cucurbitacearum (Sayed) and seed yield of N-fertilized soybean plants in the Nile Delta. Mircen Journal 3, 297–306 (1987). https://doi.org/10.1007/BF00933583

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