OPTIMAL SPACING OF A VEGETATIVE GREENHOUSE CROP
A single-state-variable vegetative crop model was used to derive the main features of the environmental-design for a quota-limited crop-growing operation. The main conclusions are: (1) Young and old plants can grow together in a single climatic compartment. (2) Spacing should be scheduled to maintain a constant canopy density. (3) Optimal canopy density is an asymptotically increasing function of available light and a decreasing function of temperature. (4) The marginal price to be paid for supplementary light decreases with available natural light.