The objective of the study was to develop a method for precise estimation of spatial and temporal variation in the elementary uptake of water by roots of an irrigated plant. The project focused on plants irrigated in a unique way, consisting in injection application of water directly within the reach of the root system. The analyses were conducted on the basis of a study performed in controlled conditions, on a cubicoid physical model with dimensions of 27.00 × 30.75 × 30.75 cm. The subject of the study was butterhead lettuce of the crisphead type (Lactuca sativa L. var. capitata L.). TDR sensors were installed in the substrate in which lettuce was cultivated, for the purpose of measurement of volumetric moisture. During the period of the experiment (28 days), the values of volumetric moisture were recorded at 10-minute intervals, at 12 points in each 4.5 cm layer of the substrate. The analyses demonstrated that the maximum (as an average for the entire volume of soil within a plant root system) intensity of elementary water uptake by lettuce (max$I_c^{∆t}$) was 0.0006 cm³cm⁻³h⁻¹. This was observed at around midday and when the plant is being irrigated. The values of elementary intensity of water uptake by plant roots in each soil volume $I_{i,j,k}^{∆t}$ were highly varied. At the point situated the closest to the nozzle of the irrigation injector the maximum value was 0.008 cm³cm⁻³h⁻¹. In a soil volume situated only 5 cm further away the maximum value was already only 0.003 cm³cm⁻³h⁻¹. In many elementary soil volumes did not pick those values up. Diurnal values of $I_{i,j,k}^{∆t}$ calculated for an injection dose of 100 cm³ were, at the same points, lower than for the dose of 200 cm³. The presented method permits the acquisition of information on spatial variation and on the dynamics of the elementary intensity of water uptake by roots, which is necessary for precise determination of the location and dose of injection from the nozzle of a high-pressure irrigation injector.

该研究的目的是开发一种精确估算灌溉植物根系对水的基本吸收的时空变化的方法。该项目着重于以独特方式灌溉的植物，包括直接在根系范围内注入水。在受控条件下进行的分析的基础上，对尺寸为27.00×30.75×30.75 cm的立方体物理模型进行了分析。这项研究的受试者被牛油的crisphead类型的莴苣（莴苣L.变种结球甘蓝L.）。为了测量体积水分，将TDR传感器安装在栽培生菜的基质中。在实验期间（28天），每隔10分钟记录一次湿度的值，间隔为每4.5 cm基材层中的12个点。分析表明，生菜吸收基本水分的最大强度（作为植物根系内土壤总体积的平均值）（最大${\mathrm{一世}}_C^{\Delta Ť}$）为0.0006cm ³ cm ^-3 h ^-1。这是在中午和灌溉植物时观察到的。每个土壤体积中植物根系吸收水分的基本强度值${\mathrm{一世}}_{\mathrm{一世}，Ĵ，ķ}^{\Delta Ť}$千差万别。在最接近灌溉喷射器的喷嘴的点处，最大值为0.008cm ³ cm ^-3 h ^-1。在仅相距5cm的土壤体积中，最大值已经仅是0.003cm ³ cm ^-3 h ^-1。在许多基本土壤体积中，这些值并没有增加。的日值${\mathrm{一世}}_{\mathrm{一世}，Ĵ，ķ}^{\Delta Ť}$在相同点上，对于100 cm ³的注射剂量所计算的剂量低于200 cm ³的剂量所计算的剂量。所提出的方法允许获取有关空间变化和根部吸收水的基本强度的动态的信息，这对于精确确定高压灌溉喷头的喷头的位置和剂量是必要的。