Ключевые слова: agriculture, ammonia, ammonium, ammonium iron, background, calcium, caviar, chemical, chemistry, crystals, fertilizer, grain, growth, industry, iron, magnesium, material, measure, natural, nitrates, nitrogen, nutrients, phosphorus, pile, pill, plant, potash, potassium, powder, salt, sodium, solution, substance, sulfate, sulfate ions, sulfur, texture, urea, white,