A Statistical investigation on association between weather parametres and crop yield in selectd Districts of karnataka
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Date
2010
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UAS, Dharwad
Abstract
A statistical investigation was carried out on association between weather parameters
and crop yield in selected districts of Karnataka for the period of 1980-2006. The statistical
tools namely correlation analysis, regression analysis, cluster analysis and different non linear
models were employed.
The results revealed that there is a association between weather parameters and crop
yield. Among selected weather variables rainfall is positively and maximum temperature is
negatively correlated with crop yield.
The models were built in order to predict yield with the help of individual weather
parameter. Best models were selected based on the significance of the variable and R2, which
explains the variation in dependent variable due to independent variables. Different non
linear models were used for predicting yield using each weather parameter, among those
power, compound, cubic, s- curve, logarithmic and quadratic models were found significant.
The results revealed from cluster analysis, rainfall classified in to three clusters
based on the departure of aridity index from the mean value. The first cluster included those
years which are considered as slight drought prone year, second cluster consists of years
which are moderate drought years. Similarly the third cluster consists of years which are
severe drought prone years respectively. Among selected years maximum years were
classified under slight drought year and only few were classified under severe drought year.
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Keywords
Agricultural Statistics