RAINFALL ANALYSIS FOR RESOURCE PLANNING IN AGRICULTURE AT BALLARI DISTRICT, KARNATAKA
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Date
2015-07-30
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UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR
Abstract
he detail analysis of rainfall is a critical for resource planning in agriculture. The
present study was undertaken to study the variation in rainfall pattern among, various
stations of Ballari district. Since, rainfall has lot of temporal and spatial variations. The
daily rainfall data of 35 years (1978-2012) were considered for the present study. The
various statistical rainfall parameters were analyzed on annual, seasonal, monthly, weekly
and daily basis. The CV of annual rainfall exceeded the threshold limit (> 25%) at all the
stations except HB Halli and Hadagali, which highlights the extremely eractic distribution
of rainfall over various stations of the Ballari district. The kharif season rainfall
contribution towards total annual rainfall varied from 53% (Ballari and Kurikoppa) to 68%
(Hacholi). The mean onset of rainy season was observed to be from 25th SMW to 28th
SMW and the length of rainy season varied from 14 weeks to 18 weeks at various stations.
The dry spell analysis showed early, mid-season and late season droughts with
varying probability intensities. The total number of drought years were found to be same
by both IMD and SPI criteria. However, magnitudes of drought (mild, moderate and
severe) varied slightly. The various rainfall amounts were derived through probability
analysis for various soil and water conservation measures. The optimal sowing dates were
suggested for sunflower, maize, groundnut, sorghum and cotton for Ballari district. The
potential weeks for rainwater harvesting varied from 2 weeks to 6 weeks during rainy
season at various stations at Ballari district.
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