Abstract: This paper reviewed the physiological requirement of plants for sulfur and the source, composition and concentration of sulfur containing compounds in the air. It also discussed their supplementary effects to plant ecosystems, the plant's absorption and assimilation to the gaseous compounds and their suitable concentrations for plants. As the requirements of human's health and eco environment in recent years, many countries have started to control the emission rate of sulfur containing waste air by legislation, which, on the contrary, has frequently resulted in sulfur deficiency for crops. In some areas, sulfur is becoming one of the most important factors limiting the agricultural development. Therefore, sulfur requiring amount and expansion extent are increasingly enlarged in the global agriculture, and more work on the research and development of sulfur fertilizers should be conducted.

Key words: Air quality, Sulfur containing waste air, Agriculture, Sulfur fertilizer requirement