LEAVES CENTER GETTING PALE ?

any red streaks in stems (not petioles)? Sulfur deficiency is possible. has that sort of inside out progression on top leaves, initially. Fe would be rare. trace elements are in soils at high enough levels. some ferts may even include the trace elements - more reason this is unlikely. If you do see trace element issues, more often it is pH related, which does not seem to be the case here. N-def would start at the bottom-up and tip-in progression - both not seen here. so the chlorosis matches S-def. If you have any purple/red streaks in stems or woody stems near bottom or base of branch, that only makes diagnosis more confident. in the end it is always a guess to some extent.