The RSA building is manly adjusted by auxin, cytokinins, ethylene and gibberellin, and the nutrient elements may regulate the RSA changes by the plant endogenous hormone.

• 生长素、细胞分裂素、乙烯和赤霉素等植物激素对根构型构建起主要调节作用，营养元素可以通过内源激素调控果树的根构型。