im not experienced,but it might be lack of fertilizer or the tree is putting energy into making new shoots instead of fruit.does the tree look healthy everywhere like leafs,bark,roots.

statics,
The trees are very healthy and I used fertilizer with high potash. I also used balance fertilizer and compost. Is there anybody with this experince or am I using the wrong fertilizer? I know some trees do give fruits every other year but I don't know about cherimoya.

Question, are you pollinating the blooms and getting no fruits OR are you getting no blooms?

I was getting a lot of blooms but I noticed they were samller than what I used to get. Some fruits that came were also small and wont grow bigger. I always prune the trees so that it will not grow too big, that hand pollination will be impossible. I probably prune too early, March 15.