How does the increased content of carbon dioxide in the ground air and soil affect cultivated plants?

The increased content of carbon dioxide in the soil air (more than 1%) negatively affects the growth of roots and germination of seeds, even if this period was short. After removal of excess carbon dioxide, a slower germination of seeds is observed. At the same time, the usual concentration of carbon dioxide in the ground air (0.03%) is insufficient for plant growth. An artificial increase in the concentration of carbon dioxide in the ground air increases the yield of plant mass by 30-50-100%, therefore it is effectively used in greenhouses, greenhouses and greenhouses.