Fertilizer is the food for plants. In essence fertilizer is minerals which the plant absorbs through their roots when they are the correct size. This is important to understand because our bodies have the same needs. Once the plants have the minerals they use sunlight and water to produce vitamins, amino acids and other nutritions for multiple purposes.
The plant uses these nutrients to fend off disease and pests. This understanding is centered around High Brix foods knowledge. I will provide more information at a later time.
One piece of information i find interesting is that each vitamins if it is real has a minerals ion in its center. For example Vitamin C has a Copper ion at its core. Likewise Chlorophyll has a Magnesium ion. This is key to understand because the minerals is actually what does the 'work'.