在薄膜溫室通風孔安裝防蟲網(wǎng)有兩個優(yōu)點。一是減少蟲害，防止昆蟲進入溫室，減少昆蟲啃食蔬菜或花果作物的數(shù)量。二是降低農(nóng)作物細菌性病毒病發(fā)生的概率，因為有些昆蟲會攜帶不利于作物生長的細菌或病毒，阻斷昆蟲生長，也是防止細菌病毒對農(nóng)作物危害的一種方法。
以上是兩個優(yōu)點的分析，但主要缺點都比較大，同時也是兩個缺點。近年來，人們發(fā)現(xiàn)，安裝防蟲網(wǎng)后，其缺點主要影響溫室通風。防蟲網(wǎng)間隙很小，前期新安裝的防蟲網(wǎng)通風效果較好。但隨著時間的推移，網(wǎng)上會有很多灰塵，甚至一些農(nóng)作物的汁液和殘渣，或者其他的灰塵和垃圾。經(jīng)過一段時間后，防蟲網(wǎng)基本上是密閉的，所以排氣口就失去了原來的意義。
對于薄膜溫室來說，一旦溫室內(nèi)的通風量降低，夏季溫室內(nèi)的溫度就會升高，很容易對農(nóng)作物造成高溫傷害。安裝防蟲網(wǎng)的兩個缺點是會增加溫室的濕度，對溫室內(nèi)的植物產(chǎn)生不良影響。由于安裝了防蟲網(wǎng)，長時間的通風效果會降低，進而增加室內(nèi)濕度。濕度一旦控制不好，就會給細菌和病毒的繁殖帶來適宜的環(huán)境，進而影響農(nóng)作物霜霉病或根腐病等病害。
以上是兩個主要的優(yōu)點和缺點。在日常生產(chǎn)中，要根據(jù)自己種植的作物考慮是否加防蟲網(wǎng)，選擇毛孔大的防蟲網(wǎng)。市場上的防蟲網(wǎng)大多是25目，所以以上分析主要集中在25目防蟲網(wǎng)的優(yōu)缺點上。
在生產(chǎn)中，防蟲網(wǎng)的選擇至關重要。夏季采用薄膜溫室。通風是主要的冷卻方式和主要的降濕措施。所以要謹慎選擇。There are two advantages in installing insect net at the vent of film greenhouse.One is to reduce insect diseases,prevent insects from entering the greenhouse,and reduce the number of insects gnawing at vegetables or flower and fruit crops.The second is to reduce the probability of crop bacterial virus disease,because some insects will carry bacteria or viruses that are not good for the growth of crops,blocking insects,and also a way to prevent bacterial virus damage to crops.
The above are two advantages of analysis,but the main shortcomings are bigger,and also two shortcomings.In recent years,it has been found that after the installation of insect proof net,its disadvantages mainly affect the ventilation of greenhouse.The gap of the insect proof net is very small,and the ventilation effect of the newly installed anti insect net in the early stage is fairly good.But over time,there will be a lot of dust on the net,even some crop juice and residue,or other dust and garbage.After a period of time,the insect proof net is basically airtight,so the vent loses its original meaning.
For the film greenhouse,once the ventilation in the greenhouse decreases,the temperature in the greenhouse will increase in summer,which is easy to cause high temperature damage to crops.The two disadvantages of installing insect proof net are that it will increase the humidity of greenhouse and have a bad effect on the plants in the greenhouse.Because of the installation of insect proof net,the ventilation effect will be reduced for a long time,and then the indoor humidity will be increased.Once the humidity is not well controlled,it will bring a suitable environment for the reproduction of bacteria and viruses,and then affect crop downy mildew or root rot and other diseases.
The above are two main advantages and disadvantages.In daily production,we should consider whether to add insect prevention net or not according to the crops you plant,and choose the insect prevention net with large pores.Most of the anti insect nets on the market are 25 mesh,so the above analysis mainly focuses on the advantages and disadvantages of 25 mesh insect nets.
In the production,the selection of insect proof net is important.In summer,film greenhouse is used.Ventilation is the main cooling method and the main humidity reduction measure.So choose carefully.
