Extensive attention has been paid to the fact that the atmospheric carbon dioxide concentration has increased from 250 ppm in preindustrial revolution to about 350 ppm to-day mainly due to human economic activities, and this trend is going on a much higher rising rate. Developed countries have conducted numerous CO_2-enrichment studies dealing with crop and wild plant species in the controlled environments for predicting influences of the global change on plant growth, especially yield and quality of main crops in the last Extensive attention has been paid to the fact that the atmospheric carbon dioxide concentration has increased from 250 ppm in preindustrial revolution to about 350 ppm to-day due due to human economic activities, and this trend is going on a much higher rising rate. have conducted numerous contractions with crop plants in the controlled environment for predicting influences of the global change on plant growth, particularly yield and quality of the main crops in the last