Agroclimatic characterization of cotton crop under parbhani district
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Date
2017-08-23
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Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani
Abstract
An investigation was carried out during 2015-2016 at Department of Agricultural Meteorology, College of Agriculture, VasantraoNaik Marathwada KrishiVidyapeeth, Parbhani entitled as “Agroclimatic Characterization of Cotton Crop under Parbhani District” with an objective to study the Agroclimatic characterization of cotton crop in Parbhani district, to assess the phenological stages in relation to weather parameter of cotton and to develop the regression model to predict the yield with meteorological variables.
In study of climate condition during 1985-2014 (30 years data) showed variability in climatic condition at Parbhani district level of Marathwada region. Temperature variability at Parbhani district results into change in the yield for cotton crop in Marathwada region.
These data was converted in to the average growing period of cotton crop i.e. (23MW to 5MW).
Variability in temperature and sunshine hours in Parbhani district results into change in GDD, HTU and PTU of cotton crop. The maximum GDD, HTU and PTU were observed (2500.03 0C days), (17286.8 0C days) and (28455.30C days) respectively.
The highest total GDD, HTU and PTU recorded NHH-44 hybrid was 3994.3 0C days, 14779 0C days and 24497 0C days hrs respectively as well as in Ajeet-155 was 3918.8 0C days, 13625 0C days and23822 0C days hrs respectively.Whereas, the lowest number of GDD, HTU and PTU was accumulated Ajeet-155 variety in 2013 (3751.4 0C days), 2013 (11590 0C days) and 2013 (21861 0C days hrs).
In Cotton crop rainfall was necessary at emerging, square formation, flowering and boll setting stage but at boll bursting stage there was no necessity of rainfall. Boll bursting stage was required low temperature (7.6-17.1 0C), low relative humidity-I and II (58-81% and 37-52%) and also boll setting was required high temperature range 19.6 0C to 31.9 0C. At square formation stage was required low bright sunshine hours i.e. 4.2 hrs.
The correlation in between variable parameter (i.e. rainfall, Maximum temperature, minimum temperature and bright sunshine hours with phenophases) and non-variable parameters (i.e. seed cotton yield) found significant. In Parbhani district rainfall was observed positively correlated with seed cotton yield in cotton crop in P1 stage and highly negatively correlated at P9 stage. While Tmax.was positively correlated with seed cotton yield at P5 stage and P8 stage. Tmin.was negatively correlated at P3 and P9 stage and P8 stage has positively correlated with seed cotton yield. Bright sunshine hours were highly negatively correlated at P7 and P8 stage with seed cotton yield of cotton crop of NHH-44 hybrid variety.
Regression equation for Parbhani district showed negatively significant effect of minimum temperature at seedling to square formation, bright sunshine hours at boll bursting to 1st picking and rainfall at 2nd picking to 3rd picking and positively significant effect of maximum temperature at flowering to boll bursting with seed cotton yield of NHH-44 hybrid variety.
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