Effect of Salt- Stress on Nodulation and Growth of Lablab Bean (Lablab purpureus) in Different Soil Textures

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Elegeil, Ghada Abdel Gadir Babker
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Tow laboratory experiments were carried out to study the effect of salt-stress on Bradyrhizobium strains namely TAL 209, ENRRI 6 and USDA 3398. Five Pot Experiments were carried out to study the effect of salt- stress and Bradyrhizobium inoculation (strain TAL 209) on growth and symbiotic properties of lablab bean cultivars in different soil textures amended with N, P and chicken manure. The results indicated that lablab bean cultivars varied in their response to inoculation and /or salinity. Nodulation was more affected by salinity than the plant growth. Bradyrhizobium strain TAL 209 significantly improved nodulation under normal conditions and salt- stress. Salinity significantly reduced shoot and root fresh and dry weights, nodules number and nodules dry weight of lablab bean. Plants grown in silt soil showed the highest results in all parameters measured followed by clay and sandy soils, respectively, under salt- stress. Under normal and saline conditions cultivar Sh. Black gave the highest results in all parameters measured followed by Sh. White and Sh. Brown, respectively. Under saline conditions, application of chicken manure significantly increased all parameters measured, where as no significant differences were observed between nitrogen and phosphorus fertilizers. Modelling of the results indicated a negative relationship between the salinity and nodule number and positive relationship between plant weight and nodule number. The results indicated that the Bradyrhizobium bacteria can be used as a biological fertilizer and to reduce the effect of salinity in soils of different textures
Salt- Stress,Lablab,(Lablab purpureus)