Rhizospheric Micro-flora, Nutrient Availability and Yield of Green Gram (Vigna radiata L.) as Influenced by Organic Manures, Phosphate Solubilizers and Phosphorus Levels in Alfisols
2012
Chesti, M.H. | Ali, Tahir
Field experiments were conducted during two consecutive kharif seasons of 2004 and 2005 at the Crop Research Farm, SKUAST-K, Shalimar campus, Srinagar, to assess the rhizospheric microflora, nutrient availability and yield of green gram as influenced by organic manures, phosphate-solubilizers and phosphorus levels in Alfisols. The results revealed that application of organic manures significantly increased the rhizospheric microbial population (bacteria, fungi and actinomycetes), available soil N P K, grain and straw yield of green gram. Among organic manures, application of FYM (10 t ha⁻¹) proved significantly superior to Dalweed (15 t ha⁻¹). Soil inoculation with P-solubilizers recorded significant increase in grain and straw yield of green gram, soil available N and P and bacterial and actinomycetes population, whereas fungal population significantly decreased due to inoculation. Among P-solubilizers, Pseudomonas proved significantly superior to Bacillus on yield of green gram, soil available P and bacterial population. Increasing levels of P up to 30 kg P₂O₅ ha⁻¹ significantly improved the grain and straw yield of green gram; microbial population (bacteria, fungi and actinomycetes) and soil available N; whereas available P of the post-harvest soil increased significantly up to 60 kg P2O5 ha⁻¹ level. The application of 60 kg P₂O₅ ha⁻¹ decreased microbial population significantly over 30 kg P₂O₅ ha⁻¹. Thus application of 30 kg P₂O₅ ha⁻¹ could be designated as the safe limit for maximum microbial build up in the green gram rhizosphere.
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