Light intensity is one of the most important environmental factors which affect the growth and yield of crops. Along with the global climate changing, cloudy and rainy climate become unfavorable events occurred frequently during filling stage of wheat at the Yangtze River Region, which is the main region of weak gluten wheat in China. The dim light events induced by cloudy and rainy climate cause direct effect on the yield and grain quality of wheat. Quantifying the influence of dim light on crop growth is ...