Abstract: The Gaia hypothesis can be divided into several sub-hypothesis :‘Influential' ,‘Co-evolutionary',‘Geophysiological',‘Optimizing',‘Homeostatic' and ‘Natural Selected'. This review focuses on these debates. It points out that we should pay more attention to the positive feedback under today's environments. It also pointes out that the hypothesis is not consistent with the Natural Selection Theory in some aspects. At last the future of Gaia hypothesis is discussed. We human beings should make the Gaia healthier for ourselves, for our offspring and for other organism friends.

Key words: Soybean, Available silicon in soil, Seed germination, Seedlings growth, Physiological function