if you use Masterblends 4-18-38 they advise that you add epsom salt at a 2 to 1 ratio, for every 2 gram of masterblend 4-18-38 add 1 gram of epsom salt, or if you buy the premixed version of 5-12-26 you dont have to add anything besides the calcium nitrate, Epsom salt is only one of many components to consider incorporating into the nutrient solution, including a standard N-P-K mi and calcium nitrate. On the back of your fertilizer, you should find it easy to follow instructions on quantity to add, as well as guidelines for the Epsom salt. The next ingredient is calcium nitrate. Calcium Nitrate . Calcium nitrate is dissolved into a dilute solution because, if too concentrated, it can form insoluble precipitates with magnesium and phosphate salts. Calcium nitrate is a common plant fertilizer used in standard feed mixes. Epsom salts have been a staple of the gardening community for magnesium supplementation and make the perfect base for your cal-mag mix. The amount of calcium and magnesium present in your water will define how much … Since all plants require calcium and nitrate nitrogen to grow, it can be a great fertilizer for the entire yard, including grass. But there are many vegetables that are commonly grown in the garden, and the calcium nitrate … 1/4 50 62 - 1/2 101 124 - Epsom Salts (Magnesium Sulfate) 1/8 - - 16 1/4 - - 33 1/2 - - 66 1 130 3 - - 395 . Calcium nitrate has many other benefits for the garden, and not just for tomatoes. As both calcium …