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大棚覆盖防虫网浇水有什么讲究
网址:https://www.shengjiewangye.com    发布时间:2020-04-08
  防虫网投入较高,应提倡多茬使用,以获取更多的回报。防虫网有一定的遮阳降温作用,但在使用过程中四周压延,空气流通不畅,温湿度相对升高。如果温湿度过高,对蔬菜的生长不利,易造成烂子、烂苗、叶色变浅、植株纤细,严重的会出现枯死。因此,在生产中宜使用大棚覆盖,并注意控制棚内湿度。一般来说,7--8月份只能用大棚覆盖,9月份可用大棚覆盖、小棚覆盖和平盖。
  Insect - proof net investment is high, should advocate many stubble use, in order to obtain more returns. Insect net has a certain role in shading cooling, but in the use of the process of rolling around, poor air flow, temperature and humidity relative rise. If the temperature and humidity is too high, adverse to the growth of vegetables, easy to cause rotten seeds, rotten seedlings, leaves become light, slender plants, serious will appear dead. Therefore, in the production should be used to cover the greenhouse, and pay attention to control the humidity in the shed. Generally speaking, in July - August can only be covered with greenhouses, in September can be covered with greenhouses, shed and flat cover.
防虫网厂家
  温室大棚防虫网虽然防虫效果好,但白色防虫网在气温较高时,网内气温、地温较网外高1 ℃左右,给蔬菜生产带来一定影响,因此7、8月份气温特别 高时,可增加浇水次数,以湿降温。
  Although the greenhouse insect control net insect control effect is good, but the white insect control net when the temperature is higher, the temperature inside the net, the ground temperature is about 1 ℃ higher than the outside of the net, to vegetable production has a certain impact, so in July, August temperature is particularly high, can increase the number of watering, in order to wet cooling.
  由于防虫网的保湿性较强,田间要比露地偏干。浇水可由早晚各一遍改为上午一遍,晚上一般不再浇水。
  As a result of the moisture of insect control net is stronger, the field should be drier than the open field. Water can be changed by morning and evening each a morning, the evening is general no longer watering.
  覆盖防虫网后,维生素C含量、净菜率均较露地高,外观色泽也比露地好,在市场上受欢迎。但叶片中叶绿素含量降低,硝酸盐含量较露地增加,这可能与防虫网遮阳和具有一定的升温效应有关。生产上叶菜类可在采收前一周揭网,恢复自然环境下生长,使其叶色转绿、植株健壮,同时也可提高防虫网的利用率。
  After covering insect-proof net, vitamin C content, the rate of pure vegetables are higher than the surface, appearance color is better than the surface, popular in the market. However, the content of chlorophyll in the leaves decreased and the content of nitrate increased, which may be related to the shading of insect control net and the heating effect. In the production of upper leaf vegetables, the net can be removed one week before harvest to restore the growth in the natural environment, so that the leaf color changes to green, the plant is robust, and the utilization rate of insect control net can also be improved.
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