Three hydroponic nutrient solution recipes to prepare 100 gal. of fer- tilizer suitable for hydroponic production of lettuce, herbs and leafy greens. If preparing to dilute in a 100-gal. reservoir, all the components within a recipe can be mixed into the water. If using stock tanks (i.e., a 100X concentration), then the calculations represent the amount to use per 1 gal. of stock. Where indicated, the Tank A and Tank B components MUST be prepared separately so a precipitate does not occur. If using stocks, dilute using 1:100 injector(s) (two injectors connected in series for Tank A and Tank B mixes). This will make 100 gal. of dilute fertilizer.