National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The historical rainfall data for the period of 37 years (1981-2017) of Junagadh district in Gujarat were analyzed for selection of most appropriate probability distribution of rainfall. From the analysis, it was found that one single probability distribution has not been found appropriate to represent all the data sets though Gamma distributions, Gumbel max.distribution and generalized extreme value distribution were found promising for most of the data sets. The best-fit distribution has been employed for obtaining the assured quantum of rainfall pertaining to23-42 Standard Meteorological Weeks (SMW) at various probability levels. The minimum assured rainfall of 20 mm and more are expected from SMW 27 onwards at 70% probability. This indicated that the sowing of kharif crops has to be done during the 27 SMW for maximum utilization of rain water. Weekly reference evapotranspiration values were estimated by the Penmen Monteith method. Water balance study by Thornthwaite and Mather. Revealed that water deficit was found to be 51.40 mm in driest year and maximum water surplus was 42.80 mm. Crop water requirement of groundnut (bunch and spreading), cotton and wheat are 338.63 mm, 414.08 mm, 818.42 mm and 581.28 mm respectively. Based on the analysis, crop planning in Junagadh district of Gujarat is suggested.
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