Effects of Microbien under Salt Stress on Nodulation, Growth and Chemical Constituents of Sesbania Aegyptiaca in Sandy Soil

摘要

Effect of salt stress and Microbien on nodulation, growth and chemical constituents of Sesbania aegyptiaca plants in sand soil was studied, in 2003 and 2004 seasons. Seeds were pre inoculated with "Microbien" which is Rhizobia sp (multistrain) bio-fertilizer at 0 and 10 gm inoculum/pot. Water salinized with NaCl, CaCl_2, Mg SO_4 and Na SO_4 (1:1:1:1) at 3000, 4500, 6000, 7500, and 9000 p.p.m were used for irrigation beginning from seedlings emergence till the experimental termination. Plant treated with saline water had the lowest nodulation as well as growth parameters. Total carbohydrates, N, P, K and S percentages were decreased by increasing salinity levels as well as chlorophyll a, b content at each season. On the other hand, salinity levels increased Na, Ca, Mg, C1 percentages, proline content and carotenoids in the two seasons. Microbien treatment gave the highest growth parameters, chlorophyll a, b content, total carbohydrates, N, P, K and S percentages. Whereas, inoculation gave the lowest values of Na, Ca, Mg. C1 percentages and proline content in the two seasons. In conclusion, bio-fertilization using Microbien overcome the reducing effect of stress up to 9000 ppm on the salt. This treatment may be recommended for inducing the growth of legume seedlings planted in sandy soil under salt stress.