Soil biological activities as influenced by integrated nutrient management in rice-wheat system
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Date
2022
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Punjab Agricultural University
Abstract
The present investigation was carried out in a field experiment conducted during 2020-2021 under a rice-wheat system at a research farm, Department of Soil Science, Punjab Agricultural University, Ludhiana, in a split-plot design with three replications. The experiment consisted of the main plots and sub plots. Main plots contained three levels of fertilizer-N application (N0, N75, and N100) and subplots included farmyard manure @ 6 t/ acre, poultry manure @ 2.5 t/ acre, press mud @ 6 t/ acre, rice straw compost @ 2.5 t/ acre, and no manure. The results of our study revealed that grain (49.5 and 46.5 kg ha-1) and straw (106.0 and 97.4 kg ha-1) yields were significantly higher under N100 and farm yard manure. The incorporation of fertilizer-N and organic amendments (N100 and poultry manure) significantly increased soil biological activity, viz., dehydrogenase, fluorescein diacetate, alkaline phosphatase, β-glucosidase, cellulase, urease, xylanase, bacteria count, fungi count,
actinomycetes count, and nitrogen fixer, respectively compared as the other treatment. In contrast, microbial biomass carbon, phenol, and peroxidase activity results were significantly higher in N100 and farm yard manure. However, the highest activity of L-asparaginase was observed in N100 and rice straw compost. Applying fertilizer-N levels and organic amendments only or in combination with inorganic fertilizer improved the physical properties like OC, WSC, available nitrogen and potassium. Furthermore, the maximum increase in available phosphorus was observed with the application of N100 and poultry manure. The studies concluded that conjoining organic manures and chemical fertilizers benefits soil biological properties, enhances soil health, and sustains crop productivity.
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Htwe, Than Nwe (2022). Soil biological activities as influenced by integrated nutrient management in rice-wheat system (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.