National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The cultivated soils have heterogeneous environments in which the soil conditions affecting microbial population, its growth and diversity fluctuate very widely in space and time and that regulate nutrients availability and crop productivity. In present study, the effect of long term (32 years) use of mineral fertilizer with and without organic manures were evaluated for monitoring the population of the nitrogen fixing Azotobacter and Azospirrilum spp. community structure, activity of urease , status of available nitrogen- their depletion and buildup in irrigated Vertisols under sorghum –wheat cropping sequence. The All India Co-ordinated Research Project of ICAR have initiated the long term fertilizer field experiment during Kharif 1984-85 at Main Center of Integrated Farming Systems Research Project of Mahatma Phule Krishi Vidyapeeth, Rahuri (Maharashtra). This experiment consists of 12 treatment combinations of only inorganics fertilizers, INM: NPK integrated with organics viz., FYM, Wheat Cut Straw and green manure, farmers practice and unfertilized control with 4 replications in RBD experimental design. The results of the long term experiment revealed that the significant the highest increase in population of Azotobacter ( 31.67 x 106cfu g-1 soil) and Azospirillum (22.60 x 106cfu g-1 soil) were observed in the INM treatment combination of organic manure (FYM)with chemical fertilizer i.e. 50% NPK through chemical + 50% N through FYM to Kharif and 100% RDF to in Rabi and the same treatment recorded highest urease activity (42.09 mg NH4+ - N 100 g-1 soil) over rest of treatments combinations. The occurrence of the dense community of Azotobacter and Azospirrilum in the INM was probably due to higher availability of substrate as carbon which help in increasing microbial population in soil.
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