Recent changes in crop water requirement (pan-evaporation) at Anand (Gujarat) India
Trends in crop water requirement at Anand, Gujarat
Keywords:
Climate change, Evapotranspiration, Moving averages, TemperatureAbstract
Climate change scenario badly affects agriculture. The present study aimed to characterize the trend in maximum temperature and crop water requirement over a last decade at Akola station (Maharashtra State), be- cause of changing trend in meteorological parameters. Study investigated the trends in temperature and reference evapotranspiration using various statistical parameters like mean, coefficient of variation, coefficient of skewness and coefficient of kurtosis. There was unsteady variation in monthly maximum temperature. The coefficient of variation ranged between 2.85 – 4.72 which indicated the variation in maximum air temperature over the year. Monthly maximum air temperature showed linear slightly decreasing trend for the months January to May and December, whereas for months from June to November, it showed an increasing trend. Hence it was concluded that in general there was a slightly decreasing trend in monthly maximum air temperature during summer season while increasing trend over monsoon and winter seasons. It was seen that monthly reference evapotranspiration showed a decreasing linear trend for April, August, September, October, November and December, while increasing trend for February, March and June. However, for January, May and July, monthly reference evapotranspiration showed a somewhat constant linear trend. In general, the monthly reference evapotranspiration showed a decreasing linear trend over the monsoon and winter seasons, whereas an increasing trend over the summer season.
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