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Hydrogen (H), derived almost entirely from water, is one of the 17 essential nutrients necessary for plant growth. Hydrogen, along with carbon and oxygen, are the three primary elements plant use in the largest amounts, and they perform as the building blocks for plant growth.otassium (K) is one of the essential nutrients and is taken up in significant amounts by crops. Potassium is vital to photosynthesis, protein synthesis and many other functions in plants. Itâs classified as a macronutrient, as are nitrogen (N) and phosphorus (P). Plants take up K in its ionic form (K +).
1 Phosphorus-this nutrient is critical in the germination and growth of seeds, flowers, fruit, and roots. 2  When phosphorus is deficient, growth is reduced and leaves fall off prematurely. 3  Plants lacking phosphorus produce dull, bluish-green leaves that turn a purplish or bronze color with brown edges.ater and air provide plants with three necessary nutrients: carbon, hydrogen and oxygen, however, in the soil there are thirteen more nutrients needed for plants to grow. This is why a soil test can help you grow healthy, verdant plants.