tailieunhanh - Isolation and characterization of associative Diazotrophs from lowland rice ecosystem

Rice crop harbours diverse beneficial plant growth promoting diazotrophs which mostly plays a significant role in supplementing not only N fertilizer but also gives indirect benefit to the crops by improving their productivity and immunity. Considering all the benefits from PGP diazotrophs, rice rhizospheric soil samples were collected randomly from 20 different locations of Jorhat district, Assam. Altogether, 53 rhizobacterial cultures were isolated in non-selective TSA media. Further, 30 pure culture isolates were grown in selective media to select diazotrophic PGPR out of which five phosphate solubilizers, three Azospirillum, one Azotobacter and one Pseudomonas for finding multiple PGP traits. Rhizobacterial cultures were morphologically and biochemically characterized and indicated that none of the culture were identical to each other. On qualitative evaluation, all selected cultures produced ammonia, IAA, HCN and urease activity but Siderophore and Antimicrobial activity were limited to few cultures. The test cultures produced nitrogenase activity ranged from 5 to µmol C2H4 ml-1 hr-1 and ammonia production from to mgl-1 . Diazotrophic PGP cultures P 20 (Azospirillium) was found the most efficient and superior culture among the test isolates followed by P 49 (PSB) and P 51 (PSB) in respect of PGP activities likes biofertilizers, phytostimulators and biocontrol properties. | Isolation and characterization of associative Diazotrophs from lowland rice ecosystem

• Nông nghiệp
• Rice crop
• Plant growth
• Lowland rice ecosystem
• Associative Diazotrophs
• Isolation and characterization
• Crop water requirement
• Irrigation Requirement
• Irrigation requirement for rice crop
• Water for rice crop
• Relevant crop coefficients
• Crop establishment
• Direct seeded rice
• Non puddled transplanted rice
• No till
• Weed dynamics
• Yield in rice rice cropping sequence
• Potato (Solanum tuberosum L )
• Non crop mulch
• Rice eco system
• Non crop mulch management
• Varying moisture regimes
• Yield of zero tillage potato
• Rain fed low land rice eco system
• Crop establishment methods
• Weed management
• Weed dynamics in rice crop
• Various crop establishment methods
• Weed management approaches
• Yield forecast of rice crop
• Simulation model
• Comparison between simulated
• Observed values of rice
• Crop establishment techniques
• N levels of rice
• Rice on system productivity
• Economics of rice greengram system
• Clay loam soil
• Rice (Oryza sativa L )
• Nutrients on yield
• Yield attributing characters
• Field experiment on rice crop
• CERES Rice
• Crop growth models
• Short duration rice
• Crop growth and productivity
• Integrated nutrient management
• Nutrient content
• Yield of rice crop
• Rice crop in Inceptisol
• Sensitivity analysis
• Faizabad region
• Climate on rice crop
• Sensitivity analysis under changing scenario
• Entrapped preceding rice crop herbicide oxadiargyl
• Herbicide oxadiargyl
• Entrapped preceding rice crop
• Yield of succeeding bhendi
• Succeeding bhendi
• Vital role
• Sub surface drainage system
• Soil chemical properties
• Rice crop at head region
• Tungabhadra command area
• Crop residues
• Soil nutrients
• Calcareous soil
• Rice wheat
• Calcareous soils of rice wheat system
• Direct effect of silicon
• Sulphur on nutrient content
• Uptake of rice crop
• Rice wheat cropping sequence
• Pooled basis
• Rice growers
• Constraints faced by rice growers
• Recommended rice cultivation practices
• Cultivation of rice crop
• Basis of maximum
• Contingent crop
• Raifed ecosystem
• Impact of contingent crop
• Rice fellow upland
• Placement of Niger crop
• Thermal requirement
• Heat use efficiency
• Agro climatic indices
• Rainfed rice crop at Bhubaneswar
• Rainfed rice crop
• Crop residue management practices
• Growth and yield of wheat
• Triticum aestivum L
• Rice wheat system
• Crop residue management
• Drum seeder
• Zero tillage
• RiceWheat system
• Profitable DSR wheat ZT in –rice wheat system
• Evaluation of crop diversification
• Crop diversification
• Intensification in rice
• Maize based cropping sequences
• Central plain zone
• Integrated crop management
• Growth and yield
• Integrated crop management approach
• Profitable rice production
• Farmer practices
• Economics of aromatic rice
• Aromatic rice
• Major crop of aromatic rice Badsahbhog
• Cost and returns
• Inputoutput ratio
• Use of inorganic
• Rice based cropping systems
• Climate resilient management practices
• Rice and rice based
• Magnesium fertilization
• Effect of potassium
• Rice crop grown
• Rice straw dry matter
• Nutrients in straw
• Direct wet seeded
• Aerobic rice
• Weed management practices on rice
• Different crop establishment methods
• Yield and economic impact