Yield potential (Ymax) can be defined as the maximum yield that can be achieved in a given environment for a certain crop or plant species. Yield potential is therefore a situation where plant growth is unlimited by water or nutrient supply and where growth potential is limited solely by uncontrollable growth-defining factors such as genetic characteristics of the plant, solar radiation, temperature and CO2 concentration. The management of yield potential is possible through plant breeding, selection of the proper cultivar or hybrid, sowing date, and plant density in relation to the variation in yield potential that is experienced from the seasonal patters of solar radiation and temperature.