Study on Long Term Trend Analysis on Occurrence of Dew at Raipur

Abstract

The present study on long term trend analysis on occurrence of dew was conducted during the 2022 year for long term data analysis of dew for the period 1991-2020 recorded at the Agro- meteorological Observatory, Research Area of Department of Agricultural Meteorology, Indira Gandhi krishi Vishwavidyalaya, Raipur, India. Based on study, daily dew observations were taken and converted into monthly and yearly dew observations. From the study, it was observed that there was significant decrease in dew amounts during the month of October, November and December. In addition to it, dew days of December month were found to be significantly decreasing. In yearly observation dew days found non-significant change and dew amount was found to be significantly decreasing. Correlation between dew amount and dew days has been tried and it was found that there exists the relationship between dew days and dew amount. In January, February, March, April, September and December months, there was positive correlation between dew days and dew amount. This indicates that if number of dew days increase, dew amount also increases. October and November months are having non-significant values. In November month, there is negative correlation coefficient because of the fact that in this month on increase of dew days, there is visual observation of dew amount decrease, though it is non-significant.