Ключевые слова: agriculture, background, black, chemical, close, compost, corn, dirt, farmer, fertilization, fertilizer, fertilizers, fertilizing, field, food, gardening, green, ground, grove, grow, growing, growth, hand, horticulture, humus, land, mineral, nature, nitrogen, nutrient, pattern, person, phosphate, phosphorus, plant, pollution, potassium, pouring, pure, rural, soil, summer, up, urea, white, young,