After studying on the photoperiod phenomenon, we recognized that growth of plants could be affected by photoperiod. Photoreceptors, which are called the entrance of ray, can reset the time of plant's day and night bio-clock. According to the process of resetting, hundreds of genes' expression could be regulated. Photoperiod could affect the nutrient uptake and utilization in maize. Strong interactions were observed between photoperiod and root-zone temperature on the concentration of numerous mineral elements in maize tops and roots. Someone proposed that photoperiod could affect the concentration of some plant-growth regulators. These plant-growth regulators could change the nutrient uptake, the effects of the phytochrome system, the membrane permeability to ions and vegetative organ morphology. Moreover, the observed effects of photoperiod on plant growth are due to their effects on the nutrient uptake. If the phenomenon is true, It would contribute to high yield of vegetative organ agriculture.