Gibberellic acid (GA) and the Rare Earth Element are beneficial to growth of plants.Use the mixture of them are more effective then use any alone

it produces Co-effect. In this paper

we presented the original study results of the Co-effect. GA can promote the synthesis of α-amylase and the Rare Earth Element increased the activation of β-amylase

it also can induce production of a certain amount of GA

and increase the activation of α-amyiase.So use mixture of GA and the Rare Earth Element produces the Co-effect for emylase.