The paper presents a method for precise estimation of evapotranspiration of selected turfgrass species. The evapotranspiration functions, whose domains are only two relatively easy to measure parameters, were developed separately for each of the grass species. Those parameters are the temperature and the volumetric moisture of soil at the depth of 2.5 cm. Evapotranspiration has the character of a modified logistic function with empirical parameters. It assumes the form ETR(θ 2.5 cm, T 2.5 cm) = A/(1 + B · e −C·(θ2.5 cm · T2.5 cm)), where: ETR(θ 2.5 cm, T 2.5 cm) is evapotranspiration [mm·h−1], θ 2.5 cm is volumetric moisture of soil at the depth of 2.5 cm [m3·m−3], T 2.5 cm is soil temperature at the depth of 2.5 cm [°C], and A, B, and C are empirical coefficients calculated individually for each of the grass species [mm·h1], and [—], [(m3·m−3·°C)−1]. The values of evapotranspiration calculated on the basis of the presented function can be used as input data for the design of systems for the automatic control of irrigation systems ensuring optimum moisture conditions in the active layer of lawn swards.
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机译：本文提出了一种精确估算所选草皮树种蒸散量的方法。针对每种草种分别开发了蒸散作用函数，其作用域仅为两个相对易于测量的参数。这些参数是温度和2.5？cm深度土壤的体积水分。蒸发蒸腾具有具有经验参数的改进逻辑函数的特征。假设形式为ETR（θ 2.5 cm ，T 2.5 cm ）= A /（1 + B·e -C·（θ 2.5 cm ·T 2.5 cm ）），其中：ETR（θ 2.5 cm ，T 2.5 cm ）是蒸散[mm·h −1 ]，θ 2.5 cm 是土壤在2.5 cm深度处的体积水分[m 3 ·m −3 ]，T 2.5 cm 是2.5 cm [°C]深度处的土壤温度，A，B和C是分别针对每种草计算的经验系数种类[mm·h 1 ]和[—]，[（m 3 ·m −3 ·°C） − 1 ]。根据提出的函数计算出的蒸散量值可以用作设计灌溉系统自动控制系统的输入数据，以确保草坪草皮有效层中的最佳水分条件。
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