SPATIAL DISTRIBUTION OF SOIL ORGANIC CARBON FRACTION IN PADDY SOILS OF SULEKERE NALA OF VISHVESHWARAIAH CANAL COMMAND AREA, MANDYA DISTRICT
Loading...
Files
Date
41138
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University of Agricultural Sciences GKVK, Bangalore
Abstract
An investigation was carried out to understand the organic carbon
distribution pattern and short term temporal changes in SOC fractions in
paddy fields of Sulekere Command Area, Mandya district. For
characterization 155 surface soil samples were collected from paddy
fields covering the entire command area before pudling, while for
understanding the changes in organic carbon fractions samples were
collected in the selected locations at panicle initiation and after harvest
of paddy. Soil characterization revealed that soils were neutral to slightly
alkaline in reaction with low soluble salts. Soils are low to medium in
available N, P and K status and sufficient in Ca, Mg and micronutrients.
The organic carbon content indicated that 12.90, 10.96 and 74.83 % of
the samples were low, medium and high in SOC status. Water soluble
carbon content increased slightly towards panicle initiation stage and
stabilized to initial level at harvest of crop. MBC and MBN were
decreased slightly from initial stage up to harvest stages. Whereas LFC
was slightly lower in the initial samples but it was higher at harvest
stage. The Coefficient of variance (%) for pH and available N was low
while EC and available K, Ca, Mg and S are moderate and SOC and
DTPA extractable micronutrients had highest variability. The range, a
semivariogram parameter indicates spatial dependence varied from 53.19
m for Cu to 329.47 m for Mg in North Nala. Whereas it was 30.12 m for
SOC and 18775.65 m for available K in South Nala.