Thanks for the question. Your apple tree is in trouble! The bark at the base of your tree is dead or missing. Most likely mechanical damaged caused by a lawn mower or weed whacker. There is so much damage that it is questionable if the tree can recover. 

I suggest that you mulch with wood chips, a minimum of 3 feet diameter around the trunk to prevent more mechanical contact. Do not mound mulch up against the trunk. Mulch against the trunk would encourage decay. Research shows the tree will heal on its own without any sealer, tar, or paint over the damaged area.

As for no blossoms/apples, it is quite common with Haralson trees. Apple trees produce fruit buds the summer before they grow fruit on those buds. The challenge is that the tree is growing fruit on last year's bud at the same time as growing new buds. So when all of the tree's energy is growing fruit there is no energy to growing new buds. Resulting in what is called biennial-bearing. This can be minimized by timely thinning of an abundant crop. Here is a link to more info: https://extension.umn.edu/fruit/growing-apples#thinning-fruit-263961

Paul -Tree Care Advisor volunteer