The Dynamic Model of Crop Growth System under the Multi-Environment External Force Action and Result Simulation

Abstract

Pot experiments with netted melon (Chunli) were conducted to study the dynamic mechanism of crop growth under the external force action of a variety of environmental factors (light, temperature, water and nutrients, etc). The interactions of environment and crops on construction of the plant morphology were studied in order to establish the dynamic model of crop growth. The paper studied the responses of the crop growth rate to the variation of the external force and its change of biomass saturation value. Comparing the dynamic model with the other plant growth model, the superiority of the former was that it combined macroscopic with microcosmic, which showed the effect of the external forces (including organic nitrogen) on stems, leaves and fruit. The results showed that nitrogen uptake and crop yield were most sensitive to total cumulative temperature and more sensitive to the critical temperature, crop extinction coefficient, the assimilate translocation efficiency to the leaf blade and the maintenance of respiration rate. In addition, crop yield was also sensitive to maximum critical cycling temperature and the leaf area index. Taking the melon growth model as an example, the theory and methodology for regulation and control of the environmental parameters in crop growth process would play important roles in facility agriculture.