Colloquium Biometricum

Vol: 39 Page: 127

Authors:

Title:
Kinetics of growth of Japanese knotweed (Polygonum cuspidatum Siebold & Zucc.)

Language: English

Keywords:

nonlinear regression

Gregory-Naidenov function of growth

energy crop

Summary:
The work investigated kinetics of the elongate growth of the Japanese knotweed shoots, singly and doubly harvested, on the objects of a variable initial nitrogen fertilization level (25, 50, 75 and 100 kg·N·ha^-1). The model of the crop growth incorporated on the Gregory - Naidenov function, as the equation H(t) = H_max[1 – b·exp(-kt)], where H – heigth of shoot, t – time, H_max – maximum heigth of shoot, b, k – coefficients. The curves of the growth and the growth rate were drawn for all variants of the field experiment. In general, the higher dynamics of the growth was characteristic for the Japanese knotweed plants mowed once, especially those fertilized with the 100 kg·N·ha^-1 dose. The applied deterministic model has proved adequate in the statistic sense (the values of the determination coefficients R² > 0.977) and therefore can be recommended for the formal characteristics of the elongate growth dynamics of the Japanese knotweed.