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SOIL ORGANIC CARBON FRACTIONS, MINERAL N AND HYDRO-PHYSICAL PROPERTIES UNDER DIFFERENT NUTRIENT MANAGEMENT PRACTICES IN PIGEONPEAWHEAT SEQUENCE

KrishiKosh

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Title SOIL ORGANIC CARBON FRACTIONS, MINERAL N AND HYDRO-PHYSICAL PROPERTIES UNDER DIFFERENT NUTRIENT MANAGEMENT PRACTICES IN PIGEONPEAWHEAT SEQUENCE
M Sc
 
Creator NINTU MANDAL
 
Contributor B.S. Dwivedi
 
Subject carbon, crops, fertilizers, organic fertilizers, fractionation, farmyard manure, nutrients, economic resources, organic matter, yields
 
Description T-8276
Decline in soil organic carbon (SOC), deterioration in physical properties and
widespread nutrient deficiencies are considered major threats to the sustainable
agriculture. The severity of these problems is greater in intensively-cropped areas of the
Indo-Gangetic Plain region. Management strategies like integrated nutrient supply and
crop diversification with inclusion of legumes may have potential to restore the soil
health. Hence, in the present investigation an attempt has been made to study the effect
of different nutrient management practices involving sole or conjoint use of fertilizers
and manures on SOC fractions, mineral N and hydro-physical properties in a
pigeonpea-wheat sequence, using a field experiment that continued for five years (2004-
05 to 2008-09) on a Typic Haplustept at IARI Research Farm, New Delhi. In addition to
fertilizer NPK and two manures i.e. FYM and sulphitation pressmud (SPM), effect of
induced defoliation (ID) imposed in pigeonpea by foliar spray of 10% (w/v) urea
solution at physiological maturity was also evaluated. Soil samples from surface (0-15
cm) and sub-surface (15-30 cm) layers were collected after completion of five crop
cycles, and analysed for different SOC fractions, mineral N and hydro-physical
properties.
Conjoint use of soil test-based fertilizer NPK and organics increased
significantly different SOC fractions, macro-aggregate associated C, and mineral N
compared with sole NPK or unfertilized-control, although the extent of increase varied
in accordance with the nature of organic inputs. Whereas FYM and SPM used along
with NPK brought significant increase in relatively stabilized SOC fractions like
Walkley and Black C (WBC) and particulate organic C (POC), the magnitude of
increase in microbial biomass C (MBC) and labile C (LBC) was greater under ID. By
and large, highest values of different SOC fractions were obtained under
NPK+FYM+ID treatment. The proportion of WBC, MBC and LBC towards TOC in 0-
15 cm soil varied from 17 to 22, 1.0 to 1.8 and 6.7 to 11.8 %, respectively. The
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corresponding figures for 15-30 cm soil depth were relatively lower. The SOC fractions
were significantly correlated with each other, particularly in 0-15 cm soil depth, and
also with mineral N and wheat yield.
Use of organic manures, especially FYM, with fertilizer NPK improved soil
aggregation, as evident by a significant increase in macro-aggregates, mean weight
diameter, geometric mean diameter and water-stable aggregates, over NPK or control.
The treatment effect was generally consistent in sub-surface (15-30 cm) soil also.
Compared with NPK, soil bulk density was reduced significantly with the conjoint use
of organics and NPK. The bulk density was lowest under NPK+FYM+ID. The hydrophysical
properties showed a positive and significant relationship with crop yields,
except bulk density (0-15 cm) which had negative relationship with yield.
 
Date 2016-10-13T12:02:47Z
2016-10-13T12:02:47Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/80482
 
Format application/pdf
 
Publisher IARI, DIVISION OF SOIL SCIENCE AND AGRICULTURAL CHEMISTRY