Evaluation of Evapotranspiration Models for Pea (Pisum Sativum) in Mid Hill Zone-India
Journal Title: Universal Journal of Environmental Research and Technology - Year 2011, Vol 1, Issue 3
Abstract
Efficient irrigation water management requires a good quantification of evapotranspiration. Lysimeter was used to measure actual crop water use and local weather data were used to determine the reference evapotranspiration (ETo). The K c values determined over the growing seasons varied from 0.5 to 1.15 for pea. The development of regionally based and growth-stage-specific Kc helps in irrigation management and provides precise water applications for this region. Six climatological models were selected for estimating reference crop evapotranspiration on a daily basis. Some of these methods are based on combination theory and others are empirical methods based primarily on solar radiation, temperature and relative humidity. According to results the crop coefficient vary among locations and even among years, depending on soil evaporation (rainfall, irrigation), vapour pressure deficit, solar radiation and reference evapotranspiration (ET0).
Authors and Affiliations
Rohitashw Kumar, Vijay Shankar and Mahesh Kumar
Keywords
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