Humidity/Water for Fruit Trees

Question

I am doing my final year project at the university and I want to ask something. I must put a soil humidity sensor on the trees, but I don’t know how much humidity it wants and then how much water. The trees are orange, apple and lemon. I hope you understand because I am from Cyprus. Thank you. . . . .

Answer 1

This link leads to a series of questions and answers about fruit trees: https://questions.gardeningknowhow.com/tag/fruit-trees
If this doesn't answer your questions well enough, you might need to research fruit tree care in Cyprus.