Ключевые слова: abstract, agricultural, agriculture, background, balls, blue, calcium, chemical, chemicals, closeup, color, colorful, colors, cultivated, environment, farming, fertile, fertilize, fertilizer, fertilizers, fertilizing, food, garden, gardening, grain, granules, growth, heap, industrial, industry, macro, mineral, nature, nitrate, nitrogen, nutrients, organic, pattern, pellets, phosphate, phosphorus, pile, plant, rural, seed, soil,