4. CONTROL OF PLANT GROWTH AND DEVELOPMENT BY CLIMATIC GROWTH FACTORS - CONTROL OF PLANT GROWTH AND DEVELOPMENT BY CARBON DIOXIDE CONCENTRATION
Looking back at the growth rate of high level crop producing systems shows the admirable capacity of the plant to collect enormous amounts of CO2 from ambient air with CO2 contents far below 1% by volume. Plant stands producing 20 g dry matter per m2 per day need about 1600 m of has air to get the necessary CO2, if they are allowed to reduce its CO concentration by 5%, and the daily biomass production can be considerably higher. Now it appears that the CO2 concentration around the shoot has a pronounced effect on the performance of the plant, brought about by influences on the photosynthetic rate and their consequences and perhaps by additional non-trophic actions of the CO2 concentration.