The cucumbers, which are radiant fruit and vegetable vegetables, are thin and evaporated and, in the high-temperature light of the summer and autumn, are prone to foliage burns, plant atrophysics, fracturing guacamole, and declining melon rates, constraining the production and quality of cucumbers in the shed. As a simple and efficient regulatory material, the sunshad network, which regulates the light, lowers the temperature of the shed and buffers against the harsh weather conditions, is an essential complement to the steady production of cucumbers in summer。
The central role of the sunshad is to regulate the light and temperature in the shed. The internal temperature of the summer and autumn fairs often exceeds 35°c. Strong direct light burns cucumber blades, accelerates water evaporation and results in early dehydration of plants. Reasonable coverage of the sun-shield can filter some of the strong light, the temperature in the shed can be reduced by 5 § 10 °c, the temperature of the blades can be reduced by 2 § 3 °c, high temperature coercion can be mitigated and solar fever can be reduced. At the same time, moderate shades of light can optimize small-scale environmental moisture in large sheds, reduce soil moisture evaporation, reduce cucumber water frequency, buffer storming of the cucumbers directly, avoid rain clicks on melon seedlings and reduce the risk of an outbreak of endemic diseases。
The cucumbers are sensitive to the light, not the higher the luminous rate the better, and excessive luminous shades result in long planters, weak tubers, fewer females, fewer sitting melons and a significant decline in production. The production of large-scale cucumbers gives priority to 35% - 50% of the sun-shield net, both to avoid the high temperature of the light and to retain sufficient light for light-cooperating purposes; during the nursery stage, the shade rate can be increased as appropriate, and low-light-shield nets can be used as much as possible for the duration of the stand-up period. Material preference is given to anti-aging flat needle protection nets, with long life spans and even light; maximum use is not made of disproportionately luminous web cloths to prevent low light from causing fertilizing melons。
In terms of use management, full-time coverage of sunnets is prohibited, and the principle of “shielding the light, not the light”. Clear weather high-temperature hours, 10 a. M. - 11 a. M., and timely release at 3 p. M. - 4 p. M.; the sunnet must be collected in the middle of the day and in the morning and in the evening when light is weak, so that the cucumber can be lumber luminous. When installed, the sunnets are not attached to the shampoo, a gap of 0. 5 m-1 metre is maintained with the roof, the flow of air is used to take the heat away, the temperature is increased, and the deterioration of the shampoo is delayed. Covered only outside the roof of the shed, with ventilated positions on both sides of the shed, taking into account the sun and ventilation。
Many growers in production practice are in faulty use, with long periods of net-laying, resulting in cucumbers that are not condensed. The sunnet is only an emergency protection tool and cannot be used as a normal cover. A combination of ventilation and management of water fertilizers will allow the full advantage of the sunnet. The science of high-temperature and high-light seasons uses a sunnet that improves the cucumber growth environment, protects the function of leaf blades, promotes the separation of female species, increases sit-in rates, reduces disease and achieves a steady increase in the summer harvest of large cucumbers。
