Citrus latifolia is increasingly being cultivated in Mediterranean areas, where the need for precise irrigation implies a sound knowledge of the crop's water requirements, which is carried out by monitoring the tree water status in the plant-soil-atmosphere system. Two year-old lime trees (Citrus latifolia Tan. cv. Bearss) were cultivated in 45 L weighing pot-lysimeters filled with a clay-loam soil and equipped with soil water sensors for recording the real-time soil water status. Irrigation, drainage, pot weight, and agro-meteorological variables were also recorded in real-time. Plant water relations - stem (Ψ_stem) and leaf (Ψ_leaf) water potentials, and leaf gas exchange - were periodically measured throughout the experiment. The automated irrigation protocol based on the volumetric soil water content was set to prevent tree water stress (with mean seasonal values of Ψ_stem above -0.8 MPa and 7 μmol m⁻² s⁻¹ and 80 mmol m⁻² s⁻¹, for net phtosynthesis and stomatal conductance, respectively). From the soil water pot balance, the computed fortnightly ET mean values throughout the growing season varied from 0.25 to 2.56 L plant⁻¹ day⁻¹ in winter and summer months, respectively. Maximum ET values occurred in July when evaporative demand was highest and lime fruits were in their most active growing phase. For day length, lime tree biomass changes were negligible, and the pot tree weight variations served for ET water balance validation (r²=0.92***). The contribution of this work is that it establishes a scalable weighing lysimeter prototype for determining the ET of lime trees grown in Mediterranean semi-arid conditions, using real-time soil water balance monitoring managed by an irrigation automation protocol. This approach could be replicated for precise ET measurements in other crops.

地中海地区越来越多地种植阔叶柑橘，精确灌溉的需求意味着对作物需水量的充分了解，这是通过监测植物-土壤-大气系统中树木的水分状况来实现的。将两岁的椴树 ( Citrus latifolia Tan. cv. Bearss) 种植在 45 L 称重的盆式蒸渗仪中，该蒸渗仪充满粘壤土，并配备土壤水分传感器以记录实时土壤水分状况。灌溉、排水、盆栽重量和农业气象变量也被实时记录。植物水分关系——茎（Ψ_茎）和叶（Ψ_叶) 水势和叶气交换 - 在整个实验过程中定期测量。基于体积土壤含水量的自动灌溉协议被设置为防止树木水分胁迫（Ψ_茎的平均季节性值高于 -0.8 MPa 和 7 μmol m ^-2 s ^-1和 80 mmol m ^-2 s ^-1，对于净光合成和气孔导度）。根据土壤水盆平衡，整个生长季节计算的每两周 ET 平均值从 0.25 到 2.56 L 植物^-1天^-1分别在冬季和夏季月份。最大 ET 值出现在 7 月，此时蒸发需求最高，酸橙果实处于最活跃的生长阶段。对于日长，椴树生物量变化可以忽略不计，盆栽树重量变化用于 ET 水平衡验证 (r ² =0.92***)。这项工作的贡献是它建立了一个可扩展的称重蒸渗仪原型，用于确定在地中海半干旱条件下生长的椴树的 ET，使用由灌溉自动化协议管理的实时土壤水平衡监测。这种方法可以复制用于其他作物的精确 ET 测量。