Crop evapotranspiration (ETc) estimation is essential for many studies such as irrigation system design and management, crop yield simulation, and water resource planning and management. Field studies were conducted at MPKV Rahuri, Maharashtra from 2015 - 2016 and 2016 - 2017 (2 years) in clay soils to determine crop evapotranspiration and crop coefficients (Kc) of the potato crop. The experimental area was cultivated with irrigation applied at 7-days interval. The irrigation scheduling was based on the field water balance approach. The crop evapotranspiration was determined by the field water balance; reference evapotranspiration (ETo) by the Penman-Monteith method and crop coefficients were computed using the standard FAO-56 methodology. The total reference evapotranspiration (ETo) and crop evapotranspiration (ETc) were 226 and 240 mm for the year 2015–2016 and 248 and 250 mm for the year 2016–2017, respectively. The 2-year average reference evapotranspiration was 237 mm and the crop evapotranspiration was 245 mm. The average estimated Kc values for the semi-arid region during the vegetative, tuber development, and maturity stages for potato are 0.55, 1.11, and 1.01, respectively. The calculated values are slightly lower than those suggested by FAO-56 for the vegetative and tuber development stages and higher for the maturity stage of potato. The estimated values of crop coefficients for potato are 11.25% higher than those suggested by FAO-56. However, observed variation between values from the FAO-Kc and Kc calculated by the field water balance is not significant. So, these values can be used for irrigation scheduling of potato in the semi-arid region.

作物蒸散量（ETc）估算对于许多研究至关重要，例如灌溉系统设计和管理，作物产量模拟以及水资源计划和管理。2015年至2016年和2016年至2017年（2年）在马哈拉施特拉邦MPKV Rahuri进行了田间研究，以测定马铃薯的作物蒸散量和作物系数（Kc）。实验区域每隔7天灌溉一次。灌溉计划基于田间水量平衡方法。作物的蒸散由田间水分平衡决定。通过Penman-Monteith方法计算参考蒸散量（ETo），并使用标准FAO-56方法计算作物系数。2015-2016年的总参考蒸散量（ETo）和农作物的蒸散量（ETc）分别为226和240毫米，2016-2017年则分别为248和250毫米。2年平均参考蒸散量为237 mm，农作物蒸散量为245 mm。在马铃薯的营养，块茎发育和成熟阶段，半干旱地区的平均估计Kc值分别为0.55、1.11和1.01。对于马铃薯的营养和块茎发育阶段，计算值略低于FAO-56建议的值，对于马铃薯的成熟阶段，计算值略高。马铃薯的作物系数估计值比FAO-56建议的估计值高11.25％。但是，根据实地水平衡计算得出的FAO-Kc和Kc值之间的差异并不显着。所以，