Madras Agricultural Journal
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Research Article | Open Access | Peer Review

Curtailing Crop Production Risk in Dry Lands of Coimbatore District, Tamil Nadu

Volume : 103
Issue: Apr-jun
Pages: 126 - 130
Published: March 28, 2023
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Abstract


A systematic study was made to assess the variability and probability occurrence (initial and conditional) of rainfall at Coimbatore. Length of Growing Period (LGP) was also computed to plan dry land crop cultivation with minimum risk. LGP was computed by two different methods viz., weekly Moisture Availability Index (MAI) and weekly Rainfall /Potential Evaporation (R/PE) ratio. The mean weekly rainfall and PET data from 1961-2010 were used to compute LGP. The results indicated that for getting more than 25 mm with 50 per cent probability was possible from 42ndto 45th Standard Meteorological Week (SMW). The chance of receiving 20 mm rainfall per week with 50 per cent probability was observed from 39th to 49th week except in 48th week. The coefficient of variation was below 150 per cent from 16th to 23rd week and from 37th to 45th week. It showed that weekly rainfall during pre-monsoon and post monsoon season is highly dependable. LGP analysis shows that 77 days (37th to 47th week) was available as per MAI method and 91 days (37th to 49th week) period as per R/PE ratio.

DOI
Pages
126 - 130
Creative Commons
Copyright
© The Author(s), 2025. Published by Madras Agricultural Students' Union in Madras Agricultural Journal (MAJ). This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited by the user.

Keywords


Co-efficient of variation Conditional probability Initial probability LGP Rainfall analysis
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