遮阳网的选择
Selection of Sunscreen
颜色：市场上常见的遮阳网有黑色和银灰色两种。黑色遮阳网遮光率高，降温效果好，适合夏季高温时段短期覆盖使用；银灰色遮阳网遮光率低，透光性好，适合喜光作物和长期覆盖使用。
Color: There are two common types of shading nets in the market: black and silver gray. Black shading mesh has high shading rate and good cooling effect, making it suitable for short-term coverage during high temperature periods in summer; The silver gray shading net has low shading rate and good transparency, making it suitable for light loving crops and long-term coverage.
材质：遮阳网的材质主要有两种，一种是高密度聚乙烯（HDPE），另一种是回收塑料。高密度聚乙烯遮阳网抗老化、耐用、无异味，使用寿命可达4年以上；回收塑料遮阳网质量差、易变形、有刺鼻气味，使用寿命只有1年左右。
Material: There are two main types of materials for shading nets, one is high-density polyethylene (HDPE), and the other is recycled plastic. High density polyethylene sunscreen is anti-aging, durable, no odor, and has a service life of more than 4 years; Recycled plastic shading nets have poor quality, are prone to deformation, and have a pungent odor, with a service life of only about 1 year.
规格：遮阳网的规格主要指宽度和长度。宽度一般为1.6米或1.8米，长度根据需要可定制。选择遮阳网时应考虑大棚的尺寸和形状，尽量减少拼接和浪费。
Specifications: The specifications of the sunshade mainly refer to the width and length. The width is generally 1.6 meters or 1.8 meters, and the length can be customized according to needs. When choosing a sunshade, the size and shape of the greenhouse should be considered to minimize splicing and waste.
遮光率：遮光率是指遮阳网能够阻挡的阳光比例。不同的作物对光照强度有不同的需求，一般来说，喜光作物如番茄、辣椒等需要较高的光照强度，光饱和点为7万勒克斯（lux），光补偿点为3万~3.5万勒克斯；不喜光作物如黄瓜、豆角等需要较低的光照强度，光饱和点为4万勒克斯，光补偿点为2万~2.5万勒克斯。因此，选择遮阳网时应根据作物的类型和季节调整遮光率，一般在40%~70%之间。
Shading rate: Shading rate refers to the proportion of sunlight that a shading net can block. Different crops have different demands for light intensity. Generally speaking, light loving crops such as tomatoes and chili peppers require higher light intensity, with a light saturation point of 70000 lux and a light compensation point of 30000 to 35000 lux; Non photogenic crops such as cucumbers and beans require lower light intensity, with a light saturation point of 40000 lux and a light compensation point of 20000 to 25000 lux. Therefore, when choosing a shading net, the shading rate should be adjusted according to the type and season of the crop, usually between 40% and 70%.
遮阳网的覆盖方式
The coverage method of sunshade net
大棚覆盖：大棚覆盖是指利用大棚的骨架将遮阳网覆盖在顶部或外侧，形成一个隔离层。这种方式可以有效降低大棚内的温度和光照强度，但也会影响大棚内的通风和透光。因此，应根据气温和光照的变化及时调整遮阳网的覆盖范围和时型槽模具 一次性止血带 保定水处理设备 一次性止血带 保定空压机 北京真空泵间，一般在正午高温时段覆盖，早晚低温时段撤除。另外，应注意遮阳网与大棚之间留有一定的空隙，避免遮阳网吸收的热量传递到大棚内部。
Greenhouse coverage: Greenhouse coverage refers to the use of the skeleton of the greenhouse to cover the shading net on the top or outside, forming an isolation layer. This method can effectively reduce the temperature and light intensity inside the greenhouse, but it also affects the ventilation and transparency inside the greenhouse. Therefore, the coverage range and time of the shading net should be adjusted in a timely manner based on changes in temperature and light, generally covering during the high temperature period at noon and removing during the low temperature period in the morning and evening. In addition, attention should be paid to leaving a certain gap between the shading net and the greenhouse to prevent the heat absorbed by the shading net from being transferred to the interior of the greenhouse.