Modelling plant growth dynamics using the example of paulownia (Paulownia energy) seedling growing

The purpose of the study was to develop and verify a nonlinear dynamic model of individual tree growth using the example of seedlings of the fastgrowing Paulownia energy species. A set of studies on mathematical modelling of physicochemical processes accompanying the growth of seedlings was conducted, including computational and field experiments to assess the adequacy of the proposed model. It has been established that during the growing of seedlings, the rate of phytomass loss through, respiration increases proportionally with the increase in leaf area. During the period of no irrigation, along with the loss of mass due to evaporation of moisture from the soil, a 1.3 time increase in seedling mass was recorded. An increase in the phytomass of the seedling by 63% was established solely due to respiration and the intake of assimilates, and without considering the mass of the pot. The high correlation coefficient (R2 = 0.99) confirmed the high accuracy of the obtained experimental data. Therefore, to maintain stable growth, it is necessary to ensure continuous micro-irrigation and active photosynthesis. The developed three-stage nonlinear kinetic model in qualitative terms reliably reflects the process of seedling growth (the correlation coefficient exceeds 90%). This facilitates its use as a basic model for predicting growth rates. It has been confirmed that accurate determination of the kinetic parameters of the process is necessary to ensure quantitative compliance. Based on research of the fast-growing species of paulownia (Paulownia energy), a nonlinear dynamic model of tree growth was created. The results obtained provide a reliable opportunity (at the level of R2 = 0.99) to predict the rate of seedlings growing and determine the optimal conditions for their growth