How Do You Add Nutrients To Soil Naturally? Posted on May 28, 2022 By Amy Kaplan FAQ How can I increase the nutrients in my soil naturally? Banana Skins. Fleshy and moist, mineral-rich banana skins easily diffuse potent nutrients into the soil. Egg Shells. Eggshells are chock full of nitrogen, calcium, and phosphoric acid. Epsom Salt. Wood Ashes. Manure. Expired Animal Feed. Coffee. Composting.