Mohamed, Faten M. and M. Y. Abou-Zeid ( 2011). Integrated Effect Of Some Biofertilizers And Proline For Improvement Of Rice Productivity Under Saline Sodic Soil ConditionsEgypt . J. of Appl. Sci., 26 (8) 2011 363-378
Abstract: Two field experiments were conducted at 2009 and 2010 seasons at Sahl El-Hessiania plane Research Station, North Sinai, Egypt, to improve the productivity of rice variety Giza 178, using two levels of NPK (75 and 100%) some nitrogen fixing bacteria( Azotobacter chroococcum and Klebsiella pneumonia), PGPR( Bacillus circulans and Bacillus spp). which were isolated from the same experimental area and proline, which was also used as osmotic adjustment in different saline soils. Proline and biofertilizers treatments showed a significant positive impact on some morphological properties of plants received 75% NPK level, such as plant tillers, height and shoot dry weight. The highest responses for these traits were due to the combined inoculation of PGPR and N2-fixing bacteria followed by PGPR with proline-treated plots. Nitrogenase and dehydrogenase enzyme activities and CO2 evolved (Microbial biological activities)l in the plant rhizosphere area were determined. Yield components and N, P and K contents in grains were also estimated. Data revealed that inoculaion with PGPR and N2-fixing bacteria under 75% of NPK led to significant increases in these tested parameters. There was no significant difference in grain yield productivity between 100% NPK treatment and those received the combined inoculum of PGPR and N2-fixing bacteria with 75% mineral fertilizer. The combined inoculation increased positively grain N and K contents and protein content. Results suggest that the beneficial effect of the PGPR and N2-fixing bacteria on rice growth, yield and yield quality was attributed to the biologically active substances produced by these microbial strains besides the nitrogen fixation of the diazotrophs, which led to cost-off and environment free pollution damage. However, it is of worth economically to recommend the use of both nitrogen fixers and PGPR microorganisms in crop cultivation.
Keywords: ()
