Ключевые слова: agricultural, agriculture, ammonia, background, calcium, chemical, clay pots, concept, dap, day, earth, fertile, fertilizer, fertilizers, garden, gardening, green, growing, growth, hand, holding, industry, love, natural, nature, nitrate, nitrogen, organic, pattern, phosphate, phosphorus, plant, planting, potash, potassium, salad leaves, seed, seeding, seeds, soil, urea, white, young,