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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/10088

Title: Moisture Stress, Bradyrhizobia, Vesicular-Arbuscular Mycorrhiza and P-Fertilizers Effects on Soybean Growth, Nutrient Content and Phosphatase Activity Under Calcareous Soil
Authors: Barakah, F. N
A. M. Heggo
Issue Date: 1998
Publisher: Annals Agric. Sci. Ain Shams Univ. Cairo,
Citation: Annals Agric. Sci. Ain Shams Univ. Cairo,
Abstract: A greenhouse experiment was desinged to study the role of vesicular -arbuscular mycorrhiza (VAM) and bradyrhizobia on soybean growth and the activity of phosphatase in soil and plant roots which were grown under water stress conditions. Soil was fertilized with either rock or super phosphate as P-fertilizer while uninoculated unfertilized soil conducted as control. VA mycorrhizal inoculation was applied in soil received rock-P fertilizer as single inoculum while dual inoculum (bradyrhizobia and VA mycorrhiza) was applied in soils received either of P-fertilizers. Data showed a significant increases in soybean shoot and root dry weights, due to inoculation with VA mycorrhiza or bradyrhizobia inoculants. Greatest values were recorded when dual inoculantion in soil received super phosphate was applied, increases reached more than 167% and four folds over control when plants grown under normal and water stress conditions respectively. Nodulation was also affected by VA mycorrhizal inoculation, maximum nodules count and weight were 82 and 2.5 gm per plant respectively, when plants were grown under normal watering conditions, while under water stress plant nodulation was affecting greatly as nodules count and weight were reduced. VA mycorrhizal colonization in soybean roots was significantly increased by application of VAM inoculant or duel inoculation and seemed to be higher under water stress conditions. On the other hand phosphatase activity trend decreased under water drought conditions but increased in treatments with either VAM or dual inoculants, maximum value recorded in plant roots were 245x102 u mole per gm root per hour in plants inoculated with both inoculants and grown in soil received rock phosphate fertilizer under normal watering conditions. Soil phosphatase activity was found to be in the same trend of that in roots but with low values. NPK concentration and contents in soybean shoots were significantly increased due to either of P-fertilizer application or endophyte inoculation under water stress and normal watering conditions The maximum N concentration and contents values were found in plant shoots growing in soil fertilized with superphosphate and inoculated with both of bradyrhizobia and VAM inoculants . P and K contents in plant shoots were in parallel with those of N contents. Data showed that VA mycorrhizal inoculation reduced the effect of water stress condition on NPK contents in soybean shoots. Micronutreint (Fe, Mn, Zn, and Cu)concentration and content in plant shoots were also affected significantly by inoculation and water stress conditions. The highest concentrations values of Fe,Mn,Zn and Cu concentrations were 438.5,174,40.8 and 26.7 ug g-1 shoot, were found in plants grown with dual inoculation treatment. Again micronutrient contents were increased significantly and maximum values were found under normal irrigation condition as water stress tended to reduce values of micronutrient shoot contents. Mycorrhizal inoculation seems to stimulate soybean resistance to drought conditions especially when it was in combination with Bradyrhizobium inoculant.
URI: http://hdl.handle.net/123456789/10088
Appears in Collections:College of Foods And Agricultural Science

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