Abstract
The paper presents an analysis of applicability of dielectric sensors for the description of water movement in irrigated soil. An innovative method of irrigation is analysed, consisting in high pressure injection of water to soil. Thanks to this, water can be supplied within a short time (1–3 seconds) at doses required for a single plant, e.g. from 300 to 700 ml. Water injection is performed by means of a mobile platform. Sensors of LP/ms (Labolatory Probe / moisture salinity) type were used for empirical determination of the initial condition in a mathematical model based on the Richards equation. That equation is usually used for the simulation of water flow in porous media. As it is a differential equation, its solution requires that an initial condition is given. In the case under consideration, that condition was the description of water state in the vicinity of the point of water injection. The state of soil water was determined with the help of sensors that allow continuous and basically non-invasive measurement of volumetric moisture. That value was converted, using a function type relation (pF curve), into the matric potential. This allowed the calculation of the total potential which is the value modelled in the predictive equation. It was demonstrated that the use of sensors of LP/ms type allows correct determination of the initial condition in the mathematical model describing water movement in soil irrigated with the injection method.
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