This is one of them.
When this red plastic mulch is put on the soil under tomatoes, it will increase yields by up to 20% over black mulch, and makes the fruit set earlier. It works by reflecting a certain spectrum of light back to the plants, which in turn triggers photosynthesis to stimulate rapid growth and development.
The research was done by a number of universities and our own tests proved it accurate. It also conserves moisture, blocks weeds and warms the soil to encourage growth. 4' wide and 30' long.
Punch small holes to allow rain to penetrate. Also works with strawberries. Most effective in cooler regions.