PRINCIPLES OF CO2 NUTRITION RESEARCH
The grower wanting to use CO2 enrichment would have to know the curve relating a wide range of CO2 regimes to costs and expected yield. The necessary information can be produced only by integrated and quantitatively expressed research from several disciplines, notably plant physiology, horticultural engineering, and economics.
Some aspects of the relationship between carbon dioxide nutrition and yield are presented, using examples from work on CO2 enrichment to roses and tomatoes in Israel. In the examples shown, CO2 enrichment appears to improve the yield of roses, both qualitatively and quantitatively, and, furthermore, high CO2 concentrations appear to increase salt tolerance in tomatoes. Assuming a high and positive correlation between net photosynthesis and yield, a strategy is outlined for approaching the levels of CO2 concentration, air temperature, humidity and wind speed under fluctuating daylight, which gives maximal net photosynthesis and hence maximal yield. Finally, it is indicated how the technique for obtaining maximal net photosynthesis will also provide quantitative data for constructing models on net photosynthesis of crops.