Abstract
ABSTRACTKnowledge of productive and nonproductive water loss of okra [Abelmoschus esculentus (L.) Moench] is essential during water scarcity, and for assessing links between yield and water use. The study was conducted using subsurface drip irrigation to evaluate okra transpiration and evaporation using the SIMDualKc Model. The model computed soil evaporation was 132.89 and 157.84 mm, respectively, whereas transpiration was 381.22 and 340.36 mm in 2016 and 2017, respectively. Pod yield of okra was 12.1 and 12.5 t∙ha−1; dry biomass above ground was 5.7 and 4.9 t∙ha−1 in 2016 and 2017. Biomass above ground and fresh pod yield of okra indicates that high water deficit before harvesting pods causes a depression in fresh fruit yield and decreases total pod yield. Several water deficit occurrences during the growing period lowers total transpiration and adversely impacts okra dry biomass above ground. The SIMDualKc Model is capable of quantifying evaporation, transpiration and other water balance components. It is an effective tool for assessing and predicting the impact of water deficit on plant development and yield and can be used to identify the correct irrigation strategy for maximizing crop production.
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