VARIABILITY AND TREND ANALYSIS OF RAINFALL FOR CROP PLANNING AND MANAGEMENT

SEVAK DAS¹*, P.H. PATEL², M.G. CHAUDHARY³, A.I. DESAI^4
1Department of Agricultural Meteorology, C.P. College of Agriculture, S.D. Agricultural University, Sardarkrushinagar, 385506, Gujarat
²Department of Agronomy, C.P. College of Agriculture, S.D. Agricultural University, Sardarkrushinagar, 385506, Gujarat
³Department of Agronomy, C.P. College of Agriculture, S.D. Agricultural University, Sardarkrushinagar, 385506, Gujarat
⁴Department of Agricultural Meteorology, C.P. College of Agriculture, S.D. Agricultural University, Sardarkrushinagar, 385506, Gujarat
* Corresponding Author : dasagmet86@gmail.com

Received : 22-03-2018     Accepted : 28-03-2018     Published : 30-03-2018
Volume : 10     Issue : 6       Pages : 5554 - 5557
Int J Agr Sci 10.6 (2018):5554-5557

Keywords : Rainfall, Variability, Trend analysis and Crop planning
Conflict of Interest : None declared
Acknowledgements/Funding : Author thankful to Sardarkrushinagar Dantiwada Agricultural University, Sardarkrushinagar, 385506, Gujarat
Author Contribution : All author equally contributed

The rainfall data of 37 year (1981-2017) of Sardarkrushinagar has been analyzed to find out fluctuations and presence of trend with historical time series. The results revealed that the annual rainfall significantly increased at the rate of 13.9 mm/year. The long term annual mean of rainfall was 704.1 ± 420.1mm with coefficient of variation of 59.7%. Decadal variability showed that the rainfall was found in decreasing trend during the decade of 1991-2000 while upward trend found during the decades of 1981-1990 and 2001-2010. The quantum of total rainfall in monsoon season was found to be increased significantly at the rate of 14.2mm/year. The contribution of winter, pre monsoon, monsoon and post monsoon rainfall to the annual mean was 0.5%, 1.2%, 94.6% and 3.7% respectively. Similarly, the quantum of monthly rainfall was found to be increased significantly in July at the rate of 10.4mm/year. July month contributes highest rainfall (43.2%) followed by August (30.9%) to the S-W monsoon rainfall. The contribution of June and September month was 9.0 and 16.7% respectively.

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