Microbial Diversity in Different Cropping Systems on Vertic Inceptisols

Microbial diversity is an integral part of biodiversity that includes bacteria, fungi, actinomycetes. Soil microorganisms; especially vary widely in semi-arid soils due to the poor vegetation, which is the result of erratic and scanty rainfall. The treatment of soil by chemical fertilizers, bio-fertilizers not only enhances soil fertility but also enriches microbial life.

This project involves the study of microbial diversity in cropping systems on Vertic Inceptisols, Soil samples were collected from BW7 field with two different cropping systems, soybean/pigeonpea (an intercropping system) and maize+safflower (a sequential cropping system) in ICRISAT. The results showed that the microbial population was higher in the medium deep soils of soybean/pigeonpea and maize+safflower compared to the shallow soils of soybean/pigeonpea and maize+safflower.

Microbiological properties of the soil samples were analyzed to study¬†the microbial diversity of the two cropping systems i.e., soybean/pigeonpea and maize+safflower. Enumeration of microbes (bacteria, fungi and actinomycetes) was done by dilution plating technique using appropriate media; average of medium deep soils of soybean/pigeonpea and maize+safflower showed higher microbial population 9×105 cfu g- 1 of soil than shallow soils of soybean/pigeonpea and maize+safflower 5.5×105 cfu g-1 of soil. 37 bacterial strains were identified. Among them 37 was Gram positive and 14 were Gram negative. Most of the strains found were Enterobacter sakazakii and Escherichia sp.,Biological parameters showed higher in the medium deep soils of soybean/pigeonpea and maize+safflower.

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