Abstract
In this work, Blaney-Criddle and Lysimeter method were applied to evaluate the actual evapotranspiration for onion crop in the semi-arid region of Chitradurga district. A reliable and accurate estimation of evapotranspiration are required for proper water balance and to define water-crop requirement. For this purpose, Lysimeter was set up in the field using three different soil layers of specific gravity 2.30. In this research work, an attempt is made to estimate daily evapotranspiration for onion crop, for which 1000ml of water was added on daily basis and corresponding percolation was observed to find the potential water balance deficit and surplus. Onion is a local crop of Chitradurga district having growth rate 90-120 days. For Blaney-Criddle equation, crop coefficient of 0.75 is adopted to estimate the actual evapotranspiration. This method was found to be simple and reliable to estimate the evapotranspiration in semi-arid region.
Highlights
In the context of climatic change, water resources for agriculture are decreasing with respect to time and space in many parts of the world with more emphasis in the semi-arid and arid regions
In Semi-Arid regions, the scarce of water resources are stored as a ground water; whereas the demand for limited ground water is increasing
This work presented a simple equation for estimating the actual evapotranspiration (ETa) from climatic and soil parameter using Lysimeter in the semi-arid regions
Summary
In the context of climatic change, water resources for agriculture are decreasing with respect to time and space in many parts of the world with more emphasis in the semi-arid and arid regions. The process of water released to the atmosphere by different ways includes solids, liquids, soil, and plants surfaces are difficult to distinguish. Together it is termed as evapotranspiration (ET). This work presented a simple equation for estimating the actual evapotranspiration (ETa) from climatic and soil parameter using Lysimeter in the semi-arid regions. Surendra Halasuru Jayaram et al.: Estimation of Evapotranspiration for Onion Crop in Semi-Arid Region: Experimental Field Setup Using Lysimeter evapotranspiration from soil and plant surfaces. The daily values of reference crop evapotranspiration (ETr) were estimated by PenmanMonteith method for 32 years [1]. The Blaney-Criddle equation was used to estimate the actual evapotranspiration and method was found to be reliable for different crop in semi-arid regions
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