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一、拱棚的开闭密闭拱棚内的温度在白天阳光充足时可达30℃以上,通常在25℃为棚膜开闭的标准温度。一般晴天8:00揭膜,傍晚盖膜。当外界气温在8℃以下时,晚间要加盖草苫保温。二、采收嫩茎伸长需要较高的温度,从萌芽到采收,15℃左右为8天,20℃以上只需4天。因此,早期低温产量上升极慢,但在不受冻害的情况下,产品质量高,尖部紧密,含糖量高。当温度达到一定范围才出现采收的高峰。相反温度升高以后,在高温影响下,尖部容易松散,风味较差。为提高品质,要加强换气降温管理,并要多灌水,增加每天的采收次数。采收方法与露
First, the opening and closing the arch Shed closed arch temperature within the daytime sunlight up to 30 ℃ above, usually at 25 ℃ for the opening and closing of the greenhouse film standard temperature. Generally sunny 8:00 uncover film, cover the evening. When the outside temperature below 8 ℃, at night to stamp grass 苫 insulation. Second, the harvesting tender stem elongation requires a higher temperature, from sprouting to harvest, about 15 ℃ for 8 days, 20 ℃ above only 4 days. Therefore, the early low-temperature production rose very slowly, but in the case of frost damage, the product of high quality, sharp tip, high sugar content. When the temperature reached a certain range before the peak harvest. On the contrary, after the temperature rises, under the influence of high temperature, the tip is easy to loose and the flavor is poor. In order to improve the quality, we must strengthen the ventilation and cooling management, and more irrigation, increase the number of daily harvest. Harvest methods and dew