苹果亩产3万斤的垂柳式整枝技术是沂源县苹果状元王春祯发明的。在他的果园里采用垂柳式整枝技术后,新建果园第三年见果,四年丰产,五年亩产15000斤,八年后平均亩产20000斤,十年高达27600斤,十五年后亩产达到30000斤。□ Apple weeping 30,000 pounds of weeping willow pruning technology is Yiyuan County apple champion invented by Wang Chunzhen. After using the weeping willow pruning technique in his orchard, the newly-built orchard will see fruits in the third year, four years of high yielding, 15,000 kg of mu per mu in five years, 20,000 kg of mu per mu in eight years and 27600 kg in ten years. After 15 years Acreage reached 30,000 pounds. □