Studies on soil health and plant growth promoting potential of Rhizobium isolates
Emirates Journal of Food and Agriculture, ISSN: 2079-0538, Vol: 27, Issue: 5, Page: 423-429
2015
- 7Citations
- 28Captures
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Article Description
A comperative study of organically and conventionally managed soils under beans was conducted to ascertain the physicochemical and microbiological characteristics of these soils. Average values of physicochemical and microbiological parameters of the rhizosphere soil samples from the selected districts were compared with the bean rhizosphere soils of the organic farm of Sher-e-Kashmir University of Agricultural Science and Technology of Kashmir India. The results revealed that the soil of the organic farm has significantly higher content of organic carbon (1.04%), available Nitrogen, (298.7 kgha-1) phosphorus (16.72 kgha-1), potassium (296.30 kgha-1), dehydrogenase activity (68.7μg TPF/24 hr g-1 soil), total viable bacteria (78.90×106 cfu g-1 soil), fungi (48.73×103 cfu g-1 soil), actinomycete (27.20×103 cfu g-1 soil), phosphate solubilizing bacteria (18.30×105 cfu g-1 soil) and mycorrhizal spores (4.10 spores g-1 soil) followed by that of district Kupwara rhizosphere soils with organic carbon (0.97%), available Nitrogen (293.0 kg ha-1), phosphorus (15.81 kg ha-1), potassium (252.3 kg ha-1), dehydrogenase activity (62.7 μg TPF/24 hr g-1 soil), total viable bacteria (72.60×106 cfu g-1 soil), fungi (45.76×103 cfu g-1 soil), actinomycete (24.3×103 cfu g-1 soil), phosphate solubilizing bacteria (14.8×105 cfu g-1 soil) and mycorrhizal spores (3.8 spores g-1 soil). Rhizobium bacteria were also isolated from the effective nodules of the bean plants grown at different places of various districts in Kashmir valley, India. These isolates after identification were screened for the production of IAA, GA and siderophores. The isolate (Rhizobium phaseoli OF) from Organic farm was found most promising by producing 39.20 μl,162 μl, and 24 μl of IAA, GA and siderophor respectively followed by 37.5 μl, 153 μl, and 21 μl of IAA, GA and siderophor respectively from the isolate obtained from rhizosphere soils of Kupwara district. The isolate (Rhizobium phaseoli OF) was used in combination with three levels of fertilizer nitrogen (0, 20 and 40 kg ha-1) in a field experiment with beans as experimental crop and five replications by adopting RBD design to study the impact on various plant growth and yield attributing features like number of pods per plant, pod weight and number of nodules. Nitrogen uptake, apparent nitrogen recovery and percent soil nitrogen utilization was also estimated. Maximum number of pods (12 plant-1) was recorded under the treatments T5 and T6. Significantly maximum pod weight (5.96 g) and number of nodules (60.45 plant-1) was observed under the treatment T5. Treatments T5 and T6 were at par with respect to nitrogen uptake in grains (63 and 64 kg ha-1), plant biomass (84 kg ha-1) and total N uptake (147 and 148 kg ha-1) by plant. Maximum apparent nitrogen recovery (210) and percent soil nitrogen utilization (46.37) was recorded from the treatment T5.
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