Trend Analysis of Weather Variables and Reference Evapotranspiration of Mustard (Brassica juncea L.) Crop for Haryana, India

The agriculture sector is a major consumer of the water resource to fulfil the requirement of irrigation. It is important to understand the crop water requirement to prepare a sustainable management of water resources. The present study was conducted for estimation of water requirement of Mustard crop and temporal variability of crop evapotranspiration for different Agroclimatic zones of Haryana during time period (1992-2022). In this IMD Daily Gridded data (Maximum temperature, Minimum temperature and rainfall) is used and converted into weekly, monthly, seasonally and annually from weather cock for run in the CROPWAT model which estimates the reference evapotranspiration (ET0), Effective rainfall, crop water requirement and irrigation water requirement. After that we analysed the trend by using Mann-Kendall test. The result of the experiment revealed that the analysis that maximum temperature of Haryana state for the time period 1992-2022 was around 30.43 ± 1.71℃ and minimum temperature was around 17.27±1.12℃ and rainfall was around 726.46±295.72mm. The monthly analysis of maximum temperature for 30 years data revealed that the month of January has lowest Maximum temperature, while May month observes highest maximum temperature and the lowest minimum temperature was in month of January in all the Agroclimatic zones of Haryana. The monthly analysis of rainfall for time period (1992-2022) showed that for overall Haryana region July month receives the highest amount of rainfall, while November month receives lowest rainfall.