Bitter pits build in apples if there’s an underlying calcium deficiency. Apples with bitter pit have black places over the pores and skin and flesh. These apples have an unappetizing bitter taste. If you would like a calcium nitrate and phosphate combination to get a foliar spray, we've done that https://marcorjbri.blogunteer.com/31219655/detailed-notes-on-calcium-nitrate-fertilizer-vung-tau