The substrates viz., Paddy straw, coir pith and jatropha husk were used for the cultivation of Hypsozygous ulmarius mushroom. After the cultivation of Hypsozygous ulmarius mushroom, the spent substrates alone and in combination with compost were used to know the effect on microbial population (total bacteria, fungi, actinomycetes, Azotobacter and phosphate solubilizing bacteria) at different growth stages (Sowing, tillering, panicle initiation and flowering) of aerobic rice in rhizosphere soil. The results of the green house experiment indicated significantly highest microbial populations (total bacteria, fungi, actinomycetes, Azotobacter and phosphate solubilizer) were recorded with Sand+Soil+Hypsozygous ulmarius spent jatropha husk+compost. However, it was followed by Sand+Soil+Hypsozygous ulmarius spent paddy straw+compost and the lowest was recorded in Sand+Soil+Hypsozygous ulmarius spent coir pith respectively.
Hypsozygous ulmarius, Spent mushroom substrate, Microbial population and Rhizosphere soil
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