A MODEL TO DESCRIBE GREENHOUSE CROPS YIELD QUANTITY AND QUALITY BASED ON MORPHOLOGICAL PARAMETERS
This model is designed to help in the planning and pre-testing of any combination of different climate control regimes and morphological plant treatments in greenhouse crops in an attempt to predetermine that the waves of flowering and fruit ripening will appear at an economically propitious date. Rose crop used as a case study. The model describes growth and canopy development by tracking the changes in the branches that make up the canopy. Each branch is described using a number of state variables that characterize the weight and size of the organs involved. The growth path taken by each part of the branch is divided into a fixed number of age stations. A number of Boxcar Trains transport the variables through the age stations. The date for the start and end of this trip, and the speed at which each train moves through the stations are calculated as if they are dependent upon genetic traits that are are biased by environmental conditions. The allocation of assimilates to each of the plant parts, (organs) is calculated according to the relationship between the assimilates Source and Sink. The quantity of assimilates made available to the growth processes by the source is calculated with the help of a photosynthesis model. The quantity of sink material is calculated using the template for the plants morphogenic potential at each age station. This calculation is performed using the parameters that should describe the morphological attributes that are a genetic function of age and the associated transformation coefficients that connect dry matter to morphological size and includes the parameters sensitivity to environmental conditions. The model is special in that it uses morphological indicators and parameters to estimate and calculate the strengths of physiological processes. The model was validated using data collected during a cooling experiment conducted in a commercial greenhouse. The model succeeds in predicting the influences of seasonal climatic change and the effects of controlled changes on the appearance of flowering waves during rose production. The model was written in the MATLAB-6 language, it is divided into modular sub-routines that can be replaced or modified.
Dayan, E., Presnov, E., Plaut, Z. and Fuchs, M. (2001). A MODEL TO DESCRIBE GREENHOUSE CROPS YIELD QUANTITY AND QUALITY BASED ON MORPHOLOGICAL PARAMETERS. Acta Hortic. 566, 437-446
models, morphology, greenhouse, cut flowers, vegetables. sink, source