ANNUAL AND SEASONALRAINFALL PROBABILITY ANALYSIS OF GUNTUR DISTRICTOF COASTAL ANDHRA PRADESH, INDIA

M. RATNAM¹*, S. VINDYA², G. KISHORE BABU³, Y. PADMALATHA^4
1Principal Scientist (Agro) & Nodal Officer, GKMS Project, Regional Agriculture Research, Acharya N. G. Ranga Agricultural University, Lam, Guntur, 522034, India
²Regional Agriculture Research, Lam, Guntur, 520 034, Acharya N. G. Ranga Agricultural University, Lam, Guntur, 522034, Andhra Pradesh, India
³Regional Agriculture Research, Lam, Guntur, 520 034, Acharya N. G. Ranga Agricultural University, Lam, Guntur, 522034, Andhra Pradesh, India
⁴Regional Agriculture Research, Lam, Guntur, 520 034, Acharya N. G. Ranga Agricultural University, Lam, Guntur, 522034, Andhra Pradesh, India
* Corresponding Author : mekala1968@gmail.com

Received : 02-10-2021     Accepted : 27-10-2021     Published : 30-10-2021
Volume : 13     Issue : 10       Pages : 10897 - 10901
Int J Agr Sci 13.10 (2021):10897-10901

Keywords : Season, Decade, South west monsoon, North east monsoon, Probability, Rainfall
Conflict of Interest : None declared
Acknowledgements/Funding : Authors are highly thankful to the CPO, JDA, STO, ASTO and Officers of Agricultural Department, Guntur district for provision of basic data for research. Authors are also thankful to Regional Agriculture Research, Lam, Guntur, 520 034, Acharya N. G. Ranga Agricultural University, Lam, Guntur, 522034, Andhra Pradesh, India
Author Contribution : All authors equally contributed

Historical district average seasonal and annual rainfall was analysed to know the seasonal and annual rainfall distribution pattern and found that out of the 883.0 mm of normal annual rainfall, 65% of the rainfall received during the SWM, 26.3% of rainfall receive during the NE monsoon period and the remaining during summer and winter periods. Decade wise annual rainfalls was analyzed and found that 29 years out of 62 years under study has recorded below normal rainfall. Monsoon period wise rainfall was analyzed and the results indicated that SW monsoon period was normal in 32 years, experienced drought in 13 years and surplus in 17 years. NE monsoon was found to be normal in 28 years, drought occurred in 24 years and surplus in 10 years. Seasonal rainfall statistics indicated that the rainfall variation was more during the winter (85.0%), summer (71.0%), NE monsoon (61.3%) and it was comparatively low during SWM (29.0%) and the probability analysis of the monsoon rainfall indicated that low during SW monsoon (29.0%). The probability analysis of winter season being dry is 56.0% in the Guntur district of south Coastal Andhra Pradesh

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