When the medium dries out the tree and fruit also dry down (become thirsty) Adding a lot of water to the medium the tree starts drinking quickly. This causes the fruit to take in water and drink rapidly. The fruit's peel cannot expand as fast as the water comes in, and the fruit burst (cracks) What is best is to keep the medium evenly moist.
Modify So for deep watering if one lets the tree dry out
water moderately at first let it be less dry ,
Then a out side tree could water for a hour to promote deep roots , and let the soil dry out.
repeat as to not shock the tree if your doing a long watering technique to promote deeper roots out side.
I have a question
If one waters only once in a while to promote deep roots in out side trees waters for a long while
If this is done is there a time one should stop doing this during fruiting or so older trees adapt out side
is this just for certain trees with harder shells like watermelon citrus annona family fruits
(people do it with grapes, apples, and other stuff out side, I know grapes split with late rains sometimes
but I forgot when the best time to stop watering deeply , and long periods)
Is that Okay with apples to water for long times but rarely ,
and water late I wonder If done for citrus would one stop deep watering outside when fruit develops or gets color or not deep water to promote deep roots)
Not sure if it's called deep watering, but just long, and not often watering like a hour watering at a time.