Can this be used for an established apple tree to help with bitter pit?

Miracle-Gro Shake'n Feed Tomato, Fruit & Vegetable Food can be used on all edibles including tree, fruits, and vegetable garden beds. Bitter Fruit is a condition related to lack of calcium in fruit and is often as a result of dry soil conditions. This product does contain calcium. This may not be the best product to help with bitter pit on a large tree. Correct feeding and watering to maintain steady growth throughout the growing season is the key to reducing problems with bitter pit. We suggest contacting your local county extension service for assistance.