目前，我国以短缺经济和数量扩张为主的发展阶段已经结束，国民经济正在向以买方市场和整体素质提高为特征的新阶段过渡。在新的宏观经济形势下，我国农产品的供求格局和市场条件同样发生了根本性的变化，农业发展的主要制约因素已从以往单纯的资源约束转向以需求约束为主... At present, the stage of development in our country dominated by the shortage of economy and the expansion of numbers has come to an end. The national economy is now transitioning to a new phase characterized by the buyer’s market and the overall improvement in its quality. Under the new macroeconomic situation, the supply and demand pattern of agricultural products in our country has also undergone fundamental changes in the market conditions. The main constraints on agricultural development have shifted from simple resource constraints in the past to demand-based constraints.