Nitrogen is usually yellow older leaves. Check out nutrient deficiency chart on an image search. Manganese and sulfur are new leaves yellow, generally. Usually micronutrient deficiencies are actually a sign of a pH issue. I'd look into some Epsom salt. If your flowers are also falling off/fruit rotting from the blossom, or bud issues, then you're probably talking a calcium deficiency. You can get a soil test to know for sure. Good luck!