IMPACT OF CLIMATE CHANGE ON CASHEW CROP AT SELECTED LOCATIONS OF KARNATAKA –A STATISTICAL ANALYSIS
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Date
2015-10-28
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
The weather data for the period 1992 – 2011 was consider to study the impact of
climate change on cashew crop productivity at Puttur and Chintamani stations. The
significant difference was noticed in the mean of two-decades with respect to rainfall and
sunshine hours at Puttur, minimum and maximum temperature at Chintamani stations.
Higher variation was found in sunshine hours(43%) at Puttur and rainfall(36%) at
Chintamani. From the result of cubic trend, minimum temperature and number of rainy
days shows declining trend and rainfall shows, increasing trend in both the stations.
Rainfall and number of rainy days showed the significant correlation with the yield in
both the stations. In stepwise-regression, the number of rainy days found to be significant
on yield in both flowering and overall period at Puttur and humidity(PM) and rainy days
found to be significant in flowering and overall period at Chintamani. Regression model
was fitted for the significant variables to obtain the expected yield, maximum yield can
be obtained when the maximum temperature is at 37 ºC and number of rainy days is 12 in
overall period. During flowering period, when sunshine hours is at 8 and number of rainy
days is 10 at Puttur station. In chintamani location, the expected maximum yield can be
obtained at humidity(AM) is 85 percent and the number of rainy days is 14 during
overall period and during flowering period, when minimum temperature is 12 ºC and
humidity(AM) is 80 percent. 5.93 and 8.30 percent of variations in the mean yield was
noticed for a given varying interval of climatic factors during overall and flowering
period respectively at Puttur In Chintamani, 11.10 and 11.4 percent variations in the
mean yield was observed for a given climatic factors during overall and flowering period.
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