Agricultural production activities are organic combinations between the courses of nat-ural reproduction and economic one. Natural reproduction course is the material base forthe agro-ecological and economic system un...Agricultural production activities are organic combinations between the courses of nat-ural reproduction and economic one. Natural reproduction course is the material base forthe agro-ecological and economic system uniformly operating. So the development ofagro-production has closely concerned with the ecological circumstances. The serious wat-展开更多
文摘Agricultural production activities are organic combinations between the courses of nat-ural reproduction and economic one. Natural reproduction course is the material base forthe agro-ecological and economic system uniformly operating. So the development ofagro-production has closely concerned with the ecological circumstances. The serious wat-
