In the greenhouse vegetable growing process in winter, due to lack of lighting in the shed, not only the potential for increasing the yield of vegetables is difficult to play, but also to a large extent affect the quality of vegetables, and prolong the growth period of vegetables. Manually increasing the light in the greenhouse can increase the yield of vegetables and greatly improve the quality. The following techniques can be used to increase lighting:

1. When planting vegetables of different varieties and heights in a greenhouse in a reasonable way, the direction of the solar radiation in the northern hemisphere should be taken into consideration, and a reasonable collocation should be made according to the principle of “lower in the north and higher in the south”. The cotyledons should be arranged in parallel when transplanted, and strict planting specifications should be adopted. , Plants, spacing and coordination, so that the plants grow neatly, to minimize shading between plants.

Second, change the scaffolding method Cultivation of greenhouses, cucumber, beans and other scaffolding vegetables, the use of waste film can be used as a hanger instead of scaffolding, can effectively improve light utilization. The method is to fix a wire along the top of the arch, insert a 25 cm long bamboo stick in the root of cucumber or kidney bean, and then cut the old film into strips and tie it vertically on the bamboo sticks and wire, after the cucumber or the bean is spread. The vine is coiled around the old membrane and coiled once every 5 to 7 days. In addition, if a scaffolding process is required, the use of the front row to the south, the middle row upright, and the rear row to the north will increase the light utilization by about 10%.

Third, to maintain the cleanliness of the film According to the survey, the film attached to a layer of water droplets, can reduce the transmittance of 30% to 50%; the new film after 2 days, 10 days, 15 days, due to contamination of dust can make the light inside the shed In turn weakened by 14%, 25% and 28%. Therefore, we should persist in cleaning the sheds. After uncovering the awnings in the sheds in the morning, bundle the soft cloths on the wooden poles and clean the dust and debris on the plastic film sheds from top to bottom to increase lighting. More than 30%, but expensive. To reduce the water droplets on the shed film, it can be covered with a mulch inside the shed; change the irrigation method, and use drip irrigation under the mulching film or hose; use a clean cloth to wipe the water droplets on the shed film; immediately after the water is sprayed, reduce the humidity, etc. Have a good effect. In addition, the snow on the shed film should be promptly removed after snowing to increase the transparency and the amount of light.

Fourth, timely decoating curtains appropriate early deduction, delay cover curtains, can extend the greenhouse lighting time. The curtain is usually exposed 0.5 to 1 hour after the sun comes out. Cover curtain time is better than half an hour before the sun goes down. It should not be too late. Cloudy days should also be exposed to scatter light. It is generally not revealed when it is snowing. It will be reopened after the weather turns fine. Fifth, the use of reflective screens using 3 meters long, 2 meters wide aluminized film reflector, hanging in the plastic post after the upper end of the column, hanging down to the ground. This will increase the brightness of the ground by about 20%, and to a certain extent, improve the warm temperature of the greenhouse, which will benefit the robust growth of vegetables and increase the yield and quality. In addition, the laying of silver gray film on the ground can also increase the light intensity between plants.

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