This is the first I’ve heard of it. If you read the ingredients you will see that it constrains nitrogen and phosphate.

Most mature trees don’t need fertilizer. You should do a soil test before adding anything to the soil around your trees. The soil test results will give you a recommendation.

You don’t want to add something that you don’t need. You also don’t want to fertilize now that the summer is warming up. 

You will probably not water it in deep enough to reach the deepest roots as they are feeding way beneath the surface. 

https://soiltest.cfans.umn.edu/testing-services/lawn-garden

https://extension.umn.edu/manage-soil-nutrients/quick-guide-fertilizing-plants

https://extension.umd.edu/resource/fertilizing-trees-and-shrubs-and-nutrient-deficiency-symptoms/

https://extension.unh.edu/resource/fertilizing-trees-and-shrubs-fact-sheet