A good layer of mulch under and around your tomato plants will go a long way toward increasing your tomato yield. Apply your mulch 2-3” deep and you will not only help the ground to retain water, you will also avoid diseases that can be caused when heavy rains splash fungus onto the leaves from the soil below.
The Pot Method
This method was created by Dr. Sam Contner at Texas A&M. Before you plant tomatoes, soak your transplants for one hour in a solution of water-soluble fertilizer mixed to half strength. Plant tomatoes as usual, setting them 3 feet apart, adding a cup of the solution into each hole.
In between each plant, bury a 1 gallon nursery pot (it will have several holes in the bottom) up to the rim. As the tomatoes begin to bloom and set, add a tablespoon of high nitrogen fertilizer to each pot and fill with water. Allow it to drain and then fill it again.
Repeat this process every 10 days during the growing season to add nutrients directly to the root zone of the plants when they need it most.
This is the most controversial gardening topic I have ever written about. I mentioned it in my 5 Most Bizarre Tricks post back in June and have talked about it at speaking engagements for years, but people always have something to say about using human urine as a tomato fertilizer. Whatever you say, there is scientific research and data that verifies the validity of the claim. I talk about it because I have used this method for years and it works.