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POOLS OF SOIL ORGANIC CARBON AS INFLUENCED BY FARMYARD MANURE AND CHEMICAL FERTILIZERS IN PEARL MILLET-WHEAT SEQUENCE ON A TYPIC HAPLUSTEPT

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Title POOLS OF SOIL ORGANIC CARBON AS INFLUENCED BY FARMYARD MANURE AND CHEMICAL FERTILIZERS IN PEARL MILLET-WHEAT SEQUENCE ON A TYPIC HAPLUSTEPT
M Sc
 
Creator PRAVASH CHANDRA MOHARANA
 
Contributor B.M. Sharma
 
Subject fertilizers, farmyard manure, carbon, nutrients, crops, organic soils, organic fertilizers, grain, npk fertilizers, crop residues
 
Description T-8267
4.1 Abstract
A field experiment on pearl millet-wheat cropping system was established on a
Typic Haplustept soil of IARI farm, New Delhi since Kharif 2003 with three nutrient
management systems, viz. farmyard manure (FYM) alone at the rate of 20 t ha-1 (T1),
Soil Test Crop Response (STCR) integrated fertilizer recommendations with FYM
(T2), STCR fertilizer recommendations without FYM (T3) and a control (unfertilized/
unmanured) (T4) with the objectives to study the long term effect of different
treatments on yield and various soil parameters. Soil sample from 0-15 cm and 15-30
cm depth were collected from a six year old field experiment in 2009 and analyzed for
bulk density, pH, EC, CEC and different pools of soil organic carbon (SOC) to
investigate the long term effect of treatments on the above mention parameters.
Significantly lower values of bulk density and higher values CEC in surface soil (0-15
cm depth) were observed in treatments (T1 and T2) receiving FYM than the treatments
without FYM (T3 and T4). No significant effect due to treatment has been observed any
of soil characteristics in sub surface soil (15-30 cm depth). The significant build-up in
all the pools of SOC, such as total organic carbon (TOC), Walkley and Black soil
organic carbon (WBC), labile soil organic carbon (LBC) and microbial biomass carbon
(MBC) were observed in T1 and T2 treatments over T3 and T4 treatments in both the
depths. The highest values of TOC (11.48 g kg-1) and WBC (7.86 g kg-1) were observed
in T1 treatment in surface soil, while the highest values of LBC (1.36 g kg-1) and MBC
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(273 mg kg-1) were observed in T2 treatment. The magnitude of change in sub-surface
soil was low as compared to the surface soil. Significant increase in all the pools of
SOC in FYM treated treatments showed the importance of FYM application in carbon
sequestration in soil. From the point of nutrient turn over and their availability to plant,
MBC and LBC pools are considered more important than total organic C pool.
Considering the significant increase in SOC content and higher increase in LBC and
MBC as well as improvement in soil characteristics, integrated nutrient management
treatment (T2) was better over farmyard alone (T1) and fertilizers alone (T3) treatments.
 
Date 2016-10-15T13:30:13Z
2016-10-15T13:30:13Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/80595
 
Format application/pdf
 
Publisher IARI,DIVISION OF SOIL SCIENCE AND AGRICULTURAL CHEMISTRY