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Title: MODELING PHOTOSYNTHESIS OF HETEROGENEOUS ROSE CROP CANOPIES IN THE GREENHOUSE

Author
item Kim, Soo Hyung
item LIETH, HEINER - U. C. DAVIS, CA

Submitted to: BARC Poster Day
Publication Type: Abstract Only
Publication Acceptance Date: 4/18/2002
Publication Date: 4/18/2002
Citation: Kim, S., Lieth, H. 2002. Modeling photosynthesis of heterogeneous rose crop canopies in the greenhouse. BARC Poster Day.

Interpretive Summary:

Technical Abstract: A new canopy training system (bent canopy) is widely used in greenhouse rose production. The bent canopy consists of an upright hedge and a mat of bent shoots between the hedges. The idea of this heterogeneous canopy is to utilize radiation that falls into the aisle space. A radiative transfer model was developed for a bent canopy. Diffuse and direct light distribution and absorption were simulated by calculating the path length of attenuated light through the canopy. Assimilation rates of sunlit and shaded leaf areas were then calculated in relation to position within the canopy and time of day. Numerical integration of the sunlit and shaded assimilation rates over the respective leaf area index (LAI) and leaf age, and over the day yielded a diurnal course of canopy photosynthesis. The geometry of the canopy was described by hedge height and width, depth and width of bent portion, row direction, leaf angle and leaf area density (LAD). The simulation indicated that bent canopy system is less sensitive to row direction than the conventional hedgerow canopy, and that desired LAD of bent portion were related to LAD of upright hedges.