Yaro class-specific control prosperous growth regulator 
 Yaro mainly edible plants roots, tubers of a class of vegetables. Such as potato, sweet potato (sweet potato, potato), taro, yam, artichoke, ginger, etc. Its products organs (roots, tubers) is located underground. 
 Yaro control expert for Wang category growth characteristics are developed from the upper stems and leaves in the control of normal growth of other plants, while returning nutrients to encourage plant roots to promote root, tuber growth, thereby increasing production.