Consequences of Different Organic Resources on Microbial Community in Rice-Mustard Cropping Sequence
Niladri Paul
Dept. of Soil Science and Agricultural Chemistry, College of Agriculture, Tripura, Lembucherra, West Tripura, Tripura (799 210), India
Gourab Roy*
Dept. of Zoology, MBB College, Agartala, Tripura (799 004), India
Utpal Giri
Dept. of Agronomy, College of Agriculture, Tripura, Lembucherra, West Tripura, Tripura (799 210), India
Dipankar Saha
Retd. Professor and Head, Dept. of Agricultural Chemistry and Soil Science, BCKV, West Bengal (741 246), India
DOI: NIL
Keywords: FYM, Humic acid, MBC, Microbial population, Organic carbon, Soil
Abstract
In Typic Fluvaquent soils of the Old Alluvial zone in West Bengal, India, an investigation was carried out to study the significance of organic matter, particularly humic acid, on the microbial community throughout the paddy cultivation (Variety MTU 1010), followed by mustard (Variety B-9). The soil has been allocated with fertilizers having recommended doses for rice field (N:P2O5:K2O::60:30:30) and mustard (N:P2O5:K2O::80:40:40), following the application of farmyard manure (FYM) @ 5.0 and 2.5 t ha-1, respectively. Additionally, commercial humic acid and FYM-extracted humic acid were applied @ 0.5 and 0.25 kg ha-1, respectively, according to the treatment arrangements. The experiment was carried out using a Randomized Block Design (RBD). Surface soil (0-15 cm) samples were gathered in definite interval to analyse organic carbon, microbial biomass carbon and microbial population. The application of extracted humic acid (EHA) demonstrated a significant positive correlation with increased organic carbon and microbial biomass carbon during cultivation of paddy, followed mustard. Hormonal behaviour of EHA, in combination to root exudation process, enhanced the microbial population at rhizosphere soil, regardless of the crop grown.
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