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1增加大棚高度为提高大棚的利用率，各地普遍加大了大棚的跨度，由以前的7米增加到8～9米，但棚高没有改变，这就缩小了采光屋面的角度，使得大棚采光性能下降，故应增加大棚高度。一般跨度为8～9米的棚，棚高应为3.40～3.60米。2改善后屋面应加大后屋面的仰角，使之达到40～43
1 Increase the height of the greenhouse To improve the utilization of greenhouses, generally increased the greenhouses across the span, from the previous 7 meters to 8 to 9 meters, but did not change the shed height, which narrowed the light roof angle, making the shed lighting Performance decline, it should increase the height of the greenhouse. The general span of 8 to 9 meters of the shed, shed should be 3.40 ~ 3.60 meters high. 2 to improve the roof should be increased after the roof elevation, so that it reaches 40 to 43