Ключевые слова: agriculture, background, beginning, biology, botany, calcium, carbon monoxide, circle, concept, copper, country, cultivated, design, earth, ecology, environment, environmental, essential, farm, fresh, garden, gardening, green, grow, growing, growth, hydrogen, idea, iron, land, leaf, light, macronutrients, magnesium, manganese, micro, mineral, nitrogen, oxygen, phosphorus, plant, potassium, sapling, science, small, soil, sulfur, technology, tree, zinc,