杨凤茹种地膜棉连年高产乐亭县汤家河镇南张庄村科技示范户杨凤茹，依靠科学技术，不断扩大地膜覆盖棉花栽培面积，产量年年不断提高，效益不断增加。１９９０年５亩“辽棉９号”。亩产皮棉６０公斤。１９９１年８亩“辽无２１５２”，亩产达到１１９公斤。１９９２年在棉... Yang Fengru species of cotton film year after year high yield Laoting County Tangjiahe Nanzhuang village technology demonstration households Yang Fengru, relying on science and technology, continue to expand the area covered by plastic film mulching, production increased year after year, increasing efficiency. In 1990 5 acres of “Liaomian 9.” Lint yield 60 kg per mu. In 1991 8 acres of “Liao no 2152”, yield reached 119 kilograms. 1992 in cotton ...