224-7 Effect of Nitrogen Fertilization and Development On Leaf Photosynthesis of Evening Primrose Crop, a C3 Plant, Under Different CO2 Concentrations.



Tuesday, October 18, 2011
Henry Gonzalez Convention Center, Hall C, Street Level

Arturo Chong, Chapingo Autonomous University, Chapingo Edo. De Mexico, Mexico
It looks that our planet is warming. Just 2010 was one of the hottest years, since meteorological data started to be tabulated. Leaf photosynthesis was measured under different CO2 air concentrations. The measurements were performed on plants that were grown in pots and fertilized with 0, 60, 120 and 180 kg of nitrogen per hectare. The leaf measurements were performed at all the development phases of this plant. As the CO2 concentrations increased also the leaf photosynthesis increased until a maximum was reached, the saturation point. Nitrogen fertilizations changed the saturation point, which was increased as the nitrogen applications increased. At the beginning of the plant cycle, leaf photosynthesis was the highest, and as it advanced the measurements decreased until leaves died. For a warm earth, with a higher CO2 concentration the increase of leaf photosynthesis is probably going to be due to the amount of nitrogen fertilizations because it can change the saturation point of leaf photosynthesis. The amount of other resources, fertilizers, water, etc., is going to be critical to maintain crop production of C3 plants in a warm earth.
See more from this Division: C02 Crop Physiology and Metabolism
See more from this Session: General Crop Physiology & Metabolism: II