Assessing the impact of climate change on groundnut water requirements in North Interior Karnataka
Keywords:
Climate change, Effective rainfall, Groundnut, Irrigation requirement, Crop evapo-transpirationAbstract
This study utilizes the CROPWAT model to evaluate the Reference Evapotranspiration (ETo), Crop Water Requirement (ETc), Effective Rainfall (ER) and Irrigation Requirement (IR) needs for groundnut cultivation under past climate conditions (1991-2020) and projected climate scenarios (2021–2050) in twelve districts of North Interior Karnataka. The findings reveal that ETo during the groundnut crop season (December-April) was higher under past climate conditions compared to projected scenarios, attributed to a decrease in average temperatures during the crop period in the future climate projections. Similarly, ETc values were higher in past climates for certain districts, corresponding with the higher simulated ETo. In contrast, ER showed lower values in the projected climate scenarios due to reduced rainfall during the crop season. Additionally, the study examines the effects of delayed sowing on crop water use efficiency, identifying a consistent increase in average IR across all districts of North Interior Karnataka over 60 years. The observed increasing trend in ETc with delayed sowing is a key factor driving the rise in irrigation requirements.
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