Nitrogen These ions provide nitrogen and are usually found in low concentrations in ground water. Levels above 10 ppm are undesirable for drinking purposes. Most plants can utilize levels between 100 and 400 ppm. Nitrate - Ammonium is found in both inorganic and organic forms in the plant, and combines with carbon, hydrogen, oxygen and sometimes sulfur to form amino acids, amino enzymes, nucleic acids, chlorophyll, alkaloids, and purine bases. Nitrogen rates high as molecular weight proteins in plant tissue.
Deficiencies exhibit slow growing, weak and stunted plants with light green to yellow older leaves.
Quality and yield will be significantly reduced. Excess conditions will be dark green and succulent with breakdown of vascular tissue restricting water uptake. Stress resistance is drastically diminished. Silicon Silicon usually exists in solution as silicic acid and is absorbed in this form. It accumulates as hydrated amorphous silica most abundantly in walls of epidermal cells, but also in primary and secondary walls of other cells.