Hi guys, can you help me figure out why my cherimoya plant started to push flushes with relatively small and yellowish leaves, compared to the first flush of the spring (and to my other cherimoya planted in a more shaded spot). Both of them get watered each 2 days.
This one is in a full sun spot (the sun is pretty hot here), the first flush after i trimmed it had regular leaves, the second flush after i tipped the first flush is like this :



Here it is last april.

My other cherimoya plant in the shade of a papaya and a pomegrenate trees has more normal and deep green leaves :

Could it be the hot temperatures? salt injuries or chlorine (although both of the plants are watered with the same water)? should i water it daily if those are symptoms of underwatered plant since it is in full sun? other clues? thanks in advance.