我乡冬季蔬菜生产主要采用中小拱棚,实践证明,这种棚的结构存在着棚矮、跨度窄、棚北侧有三分之一面积光照不足、保温性差等缺点,蔬菜产量不高。针对这些问题,我乡技术人员经多年实地观察和研究,吸收和借鉴了温室、大棚、中棚等不同类型保护地结构特点,研究设计一种一面坡式加苫竹木中棚,我们称之为改良式中棚。通过1990- Winter vegetable production in my town mainly uses small and medium-sized arch sheds. Practice has proved that this shed structure has shed short, narrow span, shed one-third of the northern side of insufficient illumination, poor insulation and other shortcomings, the yield of vegetables is not high. In response to these problems, my rural technical staff after years of field observation and research, to absorb and learn from the greenhouse, shed, shed and other different types of protective land structure characteristics, research and design of a slope plus 苫 bamboo shed, we call it To improve the style of shed. Through the 1990-