Effect of long-term fertilizers and manure application on microbial biomass and microbial activity of a tropical agricultural soil |
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| Authors: | Amrita?Chakraborty Kalyan?Chakrabarti Ashis?Chakraborty Email author" target="_blank">Sagarmoy?GhoshEmail author |
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| Institution: | (1) Department of Microbiology, University of Calcutta, Kolkata, West Bengal, India;(2) Institute of Agricultural Sciences, University of Calcutta, Kolkata, West Bengal, India;(3) Department of Agronomy, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, India;(4) University College of Science, Technology and Agriculture, 35 Ballygunge Circular Road, Kolkata, 700019, India; |
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| Abstract: | We investigated some aspects of soil quality and community-level physiological profiles (CLPP) of bacteria in soil under a
long-term (37 years) trial with either exclusive inorganic fertilizers or fertilizers combined with farmyard manure cultivated
with jute–rice–wheat system. The treatments consisted of 100% recommended dose (RD) of NPK, 150% RD of NPK, 100% RD of N,
100% RD of NPK + FYM (10 t ha−1 year−1), and untreated control. Long-term application of 150% RD of NPK lowered the soil pH considerably while the soils in the
other treatments remained near neutral. The 100% RD of NPK + FYM treated plot showed significantly highest accumulation of
organic carbon, total nitrogen, microbial biomass carbon, basal soil respiration, and fluorescein diacetate hydrolyzing activity
among the treatments. CLPP analysis in Biolog Ecoplates revealed that utilization of carbohydrates was enhanced in all input
treated regimes, while the same for polymers, carboxylic acids, amino acids, and amines/amides were similar or less than the
untreated control. However, within these groups of carbon sources, heterogeneity of individual substrate utilization between
treatments was also noted. Taken together, addition of organic supplements showed significantly increased microbial biomass
carbon and microbial activity, but input of nutrient supplements, both inorganic and organic, only marginally affected the
overall substrate utilization pattern of soil microorganisms. |
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