TREND ANALYSIS OF PRE-MONSOON RAINFALL BY USING MANN-KENDALL, SEN’S SLOPE (NON-PARAMETRIC TEST) AND LINEAR REGRESSION TECHNIQUES AT SOUTH GUJARAT

NEERAJ KUMAR¹*, B.M. MOTE², A.L. CHALODIA³, A. SRIVASTAVA⁴, M.J. ZINZALA^5
1Department of Agronomy, College of Agriculture, Bharuch, 392012, Navsari Agricultural University, Navsari, 396 450, Gujarat, India
²Directorate of Research Office, Navsari Agricultural University, Navsari, 396 450, Gujarat, India
³Main Sorghum Research Station, Surat, 390007, Navsari Agricultural University, Navsari, 396 450, Gujarat, India
⁴Department of Statistics, College of Agriculture, Bharuch, 392012, Navsari Agricultural University, Navsari, 396 450, Gujarat, India
⁵Department of Agronomy, College of Agriculture, Bharuch, 392012, Navsari Agricultural University, Navsari, 396 450, Gujarat, India
* Corresponding Author : neeraj34012@gmail.com

Received : 02-04-2021     Accepted : 27-04-2021     Published : 30-04-2021
Volume : 13     Issue : 4       Pages : 10724 - 10730
Int J Agr Sci 13.4 (2021):10724-10730

Keywords : Mann-Kendall trend, Sens slope, Excess and deficit rainfall
Conflict of Interest : None declared
Acknowledgements/Funding : The authors are thankful to India Meteorological Department, New Delhi for facilitating this work. Authors are also grateful to Department of Agronomy, College of Agriculture, Bharuch, 392012, Navsari Agricultural University, Navsari, 396 450, Gujarat, India
Author Contribution : All authors equally contributed

Rainfall data of Past 115 years (1901-2015) of five districts of south Gujarat, pre monsoon rainfall at Valsad and Bharuch shows the increasing trend while, that of Dang, Surat and Navsari districts are in declining showed by Mann-Kendall trend, Sen’s slope and regression slope. The Mann-Kendall trend, Sen’s slope and regression slope revealed that winter season rainfall at Bharuch divulges the increasing trend while, that of Dang, Valsad, Surat and Navsari districts are in declining. The frequency of occurrence of drought in pre monsoon season at Bharuch and Navsari districts is higher as compared to Dangs, Valsad and Surat districts. Likewise, the frequency of occurrence of excess rainfall at Dangs and Valsad districts is higher as compared to Surat, Navsari and Bharuch districts

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