Ключевые слова: agricultural, agriculture, ammonia, background, black, blue, brown, calcium, carbide, chemical, concept, dap, fertile, fertilizer, garden, grain, growth, industry, inorganic, magnesium, mineral, nitrate, nitrogen, organic, phosphate, phosphorus, pink, plant, potash, potassium, red, rock, roots, sodium, soil, sulfate, synthetic, urea, white,