One way to get nutrients from trees and grasses is to transport them through the roots. As plants use their roots, nutrients pass through the xylem. There has been interest in estimating the above nutrient amount to select the required increase in plant body weight. For estimation, we consider a model of the vertical rise of a saline solution in the xylem. We analyze the kinematic changes of the solutions in terms of various parameters. We consider analytical techniques to identify patterns underlying decision-making. This approach gives a possibility to consider changes in parameters in space and time, as well as the nonlinearity of the considered processes.