Symbiotic nitrogen fixation in soybean and possible improvement under saline stress [Egypt]
1988
Abdel-Hafez, A.G. (Tanta Univ., Kafr El-Sheikh (Egypt). Faculty of Agriculture) | Yanni, Y.G.
Two field experiments were carried out in 1984 and 1985 seasons to study the interaction between three Bradyrhizobium japonicum strains and seven soybean (Glycine max L.) genotypes, in saline affected soils at Kafr El-Sheikh, compared to the uninoculated check. Strain E 41 formed the highest number of nodules and the cultivar "Clark" averaged the highest number of nodules. Also, strain E 41 induced the highest weight of nodules and cultivar "Clark" carried also the heaviest weight of nodules. N percent and content per plant tissue, 50 days from planting, did not different significantly. Significant differences in seeds N - content were found and the strain E 41 raised N-content in soybean seeds compared to strains E 38 and Rj-500. The mg N/g seeds was statistically the same in the seven genotypes. Inoculation did not produce significant increase in seed yield per unit area in the field. Cultivar Forrest outyielded the other six cultivars. Also, Clark and Ransom out-yielded Calland and Bossier. Also, Tracy outyielded Calland. The interaction strains x cultivars was generally not significant which is attributed to the saline stress conditions. The study indicates, the presence of variability in Bradyrhizobium bacteria and in soybean. This is important because of the possibility it offers selection of plant and bacterial genotypes capable of improving symbiotic nitrogen fixation under adverse conditions.
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