RAINFALL ANALYSIS OVER KALYANA KARNATAKA DISTRICTS FOR RESOURCE PLANNING IN AGRICULTUREVishwanath, G.V. Venkataramana and N. Prabhakaran
The study has been made to analyze the rainfall of six districts of Kalyana Karnataka by utilizing the past 50 years (1971-2020) rainfall data. The rainfall data was critically examined and analyzed statistically for annual and seasonal values followed by computation of trend analysis of annual rainfall. The results revealed that, the highest mean annual rainfall was recorded at Bidar (917.8 mm) followed by Yadgir (877.8 mm) and the lowest at Ballari (559.8 mm). The CV varied between 24.0% (Bidar) to 32.6% (Yadgir). From the skewness analysis it was observed that, skewness varied from 0.3 (Bidar and Koppal) to 0.7 (Yadgir and Raichur). The Yadgir district showed zero Kurtosis and the remaining districts were found to be negatively Kurtosis and it varied from -0.1 to -0.6. The Raichur district showed 0.6 positively Kurtosis. From regression analysis, it was found that, the slopes of regression line of annual rainfall are positive at Bidar, Raichur and Koppal. This shows that these districts have increasing annual rainfall trend. However, since the correlation coefficient value (R2) is too low, the increasing trend is not significant. The remaining stations (Kalaburgi, Yadgir and Ballari) showed negative slope of regression line. This indicates these stations have decreasing trend of annual rainfall. The mean monsoon season rainfall varied between 315.3 mm (Ballari) to 705.8 mm (Bidar) and the CV was found to be more than 30% in all the districts which indicate highly erratic rainfall and the rainfall is not much dependable around the mean rainfall. The skewness analysis revealed that, all the stations showed positive skewness and it varied between 0.3 (Raichur and Koppal) to 0.9 (Yadgir).