A: Red Fuji apple is a favorite potassium variety. Therefore, after applying more potassium fertilizer in July, the fruit coloring index can be increased by 24.4% and the sugar content by 2.4%. In addition, foliar spray fertilizer is also a good choice. Spraying 500 mg/kg of rare earth solution near the coloring can make the coloring 12 to 17 days earlier, the coloring index is increased by 24.2%, and the whole red fruit rate is increased by more than 5%. The amount is increased by 0.9% to 1.6%, and the ratio of sugar to acid of the fruit is increased. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Foshan Ja Suo Medical Device Co., LTD , https://www.fjoralinstrument.com