Photorespiration

The usage of carbohydrates in a plant, especially when the temperatures are high and also when light levels are high: Respiration rate exceeds the rate of photosynthesis. This only occurs in cool-season, C3, plants and reduces the overall efficiency of photosynthesis. Over saturating a grass sward with artificial lighting (exceeding what is called the light saturation point) within a stadium situation will typically result in the usage of carbohydrates. This will also typically result in weaker rooting.