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| Nematode Neutralization Nitrates Nitrification Nitrogen Cycle Nitrogen Fixation Nitrogenase Non-Humic-Matter Nutrient |
| Very soluble salts of nitric acid (Potassium, Magnesium, Calcium, Ammonium nitrates); all plants assimilate them easily. Nitrogen excess when wheather is cold and cloudy provoking nitrates accumulation in the plant (In France, for instance, authorized maximum contents are : 4000 ppm of NO3- for lettuce, 300 ppm for carrot and 50 ppm for babies food.
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