It is so important to keep uniform moisture to your fruit trees and tomato plants. If you don't, you will probably experience the dreaded fruit cracking or splitting right about harvest time. It is so disappointing when that happens as most people work very diligently trying to bring home the perfect and abundant crop. No matter the fruit (apples, cherries, plums, pears and tomatoes) they are all susceptible.
It is really pretty simple to alleviate most of the problems by simply applying uniform moisture. During periods of less than 1 inch of rain per week you need to supplement the rainfall. Tomato plants should be deeply mulched (minimum 2 inches) to retain uniform moisture. Tomato plants need sufficient moisture to present you with large and tasty fruit. Is a tomato a fruit or a vegetable? We'll save that for another time.