Ключевые слова: agricultural, agriculture, ammonia, ammonium nitrate, background, bag, calcium, chemical, chemistry, closeup, concept, cultivated, environment, experiment, farmer, farming, fertile, fertilization, fertilize, fertilizer, fertilizing, gardening, gloves, hand, holding, industrial, industry, inorganic material, magnesium, material, mineral, nature, nitrate, nitrogen, nutrients, phosphate, phosphorus, pill, potash, potassium, production, research, researcher, scientific, seed, sodium, substance, surface, test, urea,