Brix is one of the most fascinating topics in organic gardening. It measures the dissolved solids in plant juice, which includes sucrose and fructose, vitamins and minerals, protein and amino acids, and many others. If you are trying to grow the best tomatoes and you want to get many dozens of tomatoes from each plant, it could be worth it. If you have a huge bed of something like potatoes, go for it. Even good organic fertilizers are sometimes not wanted by our plants. You can have at try to practically understand the applications of the brix in your organic garden.