Journal of Advanced Microbiology

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Abstract: The soil on Earth’s surface is characterized by the organic and mineral content in them. The

activity of enzymes and microbial biomass present in it has significant impact on nutrient cycling which is

directly related to fertility and crop yield in that area. In our study, samples of top soil were studied from four

different locations in Nothern part of India, namely, Solan (Himachal Pradesh), Jagatpura (Punjab), Allahabad

(Uttar Pradesh) and Satna (Madhya Pradesh), with respect to four pre-dominant soil enzymes viz. Dehydrogenase,

Polyphenol oxidase, Urease and Catalase. The studies regarding spatial variation of activity of these four soil

enzyme along with the microbial biomass content along the latitudinal gradient in North-central India are

unclear in context with the national status. The present study facilitates the above mentioned assessment with

respect to the effect of climatic variations, enzyme activity and biomass on nutrient cycling (organic carbon,

available nitrogen and phosphorous) in respective agro-ecosystems. Along the increasing latitude, it was

observed that organic carbon decreases whereas available phosphorous and available nitrogen increases

(P<0.05). Further, it was seen that the amount of microbial biomass carbon (MBC) declined and microbial

biomass nitrogen (MBN) increased (P<0.05). Polyphenol activity and urease activity was found to decrease

and dehydrogenase activity showed an increasing trend. In addition, catalase activity showed no significant

relation with latitude (P<0.05). In accordance with the present study, it can be inferred that the distribution of

enzyme activities and microbial biomass may be the consequence of alterations in temperature and moisture of

soil because of which soil properties like organic carbon, nitrogen, phosphorous change along the latitudinal