Giving too much water at a time causes blossom-end rot. The solution is to divide the amount of water into many doses per day.
While most folks see irrigation as a survival need, it’s more than that. It’s directly related to how much you can get out of your greenhouse. Not enough water and your plants can’t transpire. Too much and you’ll get sclerotinia rot as well as root issues. Adapting the irrigation to the sunlight is often a limiting factor for growers.
You want tasty fruits, you need potassium. Over-irrigation makes your tomatoes bland because it flushes away nutrients. On the other hand, too little water and cucumbers don’t get that juicy taste.