Abstract
The influence of humic acid and fertilisers on microbial population and rhizosphere enzymes in sugarcane rhizosphere was studied. Among the microbial population, bacteria were found to dominate, varied from 26.3 x 105 to 38.3 x 105 cfu g-1 at different levels of fertiliser and humic acid. Application of 100 per cent NPK with 20 kg HA ha-1 recorded higher bacterial population of 35.8 x 105 cfu g-1 while 100 per cent NPK and 30 kg HA ha-1 recounted maximum of fungi and actinomycetes (14.0 x 103 cfu g-1 and 15.3 x 104 cfu g-1) population. Application of 100 per cent NPK recorded the maximum amount of soil enzymes. Humic acid at 20 kg HA ha-1 were found to enhance the catalase activity (164.9 mg of KMnO4 oxidised g-1 20 min-1) and alkaline phosphatase activity of 65.3 m mol p-intro phenol g-1 hr-1. Humic acid application at 30 kg ha-1 significantly influenced the dehydrogenase activity of 115.9 ig of TPF formed g-1 24 hr-1. The increase in population might be due to the presence of humic acid in the root zone, which favours the microbial growth in the rhizosphere.
Published Version
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