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 impact of the long–term fertilization alone and in combination with FYM for 30 years was evaluated on microbial and enzymatic activities after rice under a continuing long-term fertility experiment in rice-wheat cropping system initiated in kharif, 1984 at G.B. Pant University of Agriculture and Technology, Pantnagar. The experiment comprised 14 treatments having absolute control, individual N and its combination with P and K at varying levels alone and with FYM. The balanced application of nutrients through chemical fertilizers alone or with FYM resulted in higher microbial activity in terms of higher dehydrogenase and urease activity in soil; microbial respiration and synthesis of microbial biomass nitrogen in different soil layers through the soil profile up to 60 cm. The higher microbial activity was evident in surface layer (0-15 cm) decreasing with depth in all the treatments. Highest buildup of dehydrogenase and urease activity, microbial respiration and microbial biomass nitrogen in all the layers up to 60 cm depth was supported by the application of N180 + P80 + K40 + Zn(F) + FYM except microbial biomass nitrogen (MBN) in sub-surface layers (15-30 and 30-60 cm). The MBN synthesis was higher in sub-surface layers due to N120 + P40 + K40 + ZnF + FYM. Maximum grain yield was also produced due to application of N120 + P40 + K40 + Zn (F) + FYM. The significant strong correlations were observed between MBN, dehydrogenase and urease activity; microbial respiration and grain yield of rice. The results indicated that long-term addition of balanced fertilizer in conjunction with FYM has the most beneficial effects on soil biological health vis-à-vis rice productivity.
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