RELATIONSHIP BETWEEN PHOTOSYNTHESIS AND SUBSTRATE MOISTURE FOR CONTAINER-GROWN HIBISCUS AND CORNUS
A photosynthesis-based irrigation system is a novel approach to nursery crops irrigation management and could conceivably reduce water use during production. Experiments were conducted to determine the plausibility of a photosynthesis-based irrigation system. Cuttings, seedlings, and grafted (self and reciprocal) plants from two woody genera (Hibiscus rosa-sinensis, Cornus florida and Cornus kousa) were tested. To determine if the plants responded similarly to reduced substrate moisture, gas exchange was measured over a range of substrate moisture contents. Photo¬synthetic rates remained near maximum over a wide range of substrate moisture contents. Moisture response curves were similar among the species and among cuttings, seedlings, and grafted plants. A sigmoidal equation best represented the relationship between photosynthetic rate and substrate moisture content.
Fulcher , A. and Geneve, R. (2011). RELATIONSHIP BETWEEN PHOTOSYNTHESIS AND SUBSTRATE MOISTURE FOR CONTAINER-GROWN HIBISCUS AND CORNUS. Acta Hortic. 922, 183-186
nursery crops, water deficit, substrate water content