Quantification of rhizosphere microflora of coconut in sandy and lateritic soils

摘要

There was considerable variation in the microbial population in the sandy and lateritic soils of coconut rhizosphere. Maximum mean microbial population (96.57 x 10~3g~(-1)) was recorded in lateritic soil in comparison with that of sandy soil (64.61 x10~3g~(-1)). Bacterial population was maximum in both the soil types and was 27.57 x 10~3g~(-1) and 75.88 x 10~3g~(-1) in sandy and lateritic soils respectively. It was followed by fungi. However, the actinomycetes population was comparatively very low.When fungal population was compared with the total microbial population, it was revealed that sandy soils recorded comparatively more fungi load of 47.34 x 10~3g~(-1) as compared to lateritic soils is 8.39 x 10~3g~(-1) Most predominantly occurring bacteria were species of Bacillus and Pseudomonas while two species of Aspergillus viz. A. niger and A. terreus and Penicillium chrysogenum were most commonly occurring fungi in both the soil types.