How to make up the light of strawberries in greenhouse in winter

Light is an important factor that limits the yield and benefit of strawberry in greenhouse. When lack of light, it not only affects the normal growth and development of strawberry, but also directly affects the temperature, humidity and carbon dioxide concentration in the greenhouse. Especially in winter, bad weather will affect the light, so how to make up the light in the greenhouse? Come and have a look with the editor.

1. Characteristics of greenhouse lighting.

Because the greenhouse skeleton and covering materials block the sun, the light intensity in the greenhouse is only about 70% of that in the open field, and the new and old intensity of the agricultural film will also affect the light intensity. If it is an old film contaminated by dust and mud, its light transmittance is only 40%. And the light distribution in the greenhouse is extremely uneven, generally strong above, weak below, the higher the scaffolding, then the weaker the light intensity near the ground. The illumination time of greenhouse is obviously shortened due to the influence of weather, operation in greenhouse and other factors, which will seriously affect the flower bud differentiation and the opening of male and female flowers. Such as rainy days and haze days, not only the light intensity is weak, but also the duration of light is short.

2. Conventional light supplement methods.

In the choice of agricultural film, we can use high-quality drip-free film, which can increase the light transmittance of the greenhouse, and at the same time, we should often scrub the greenhouse film to keep it bright and clean, so as to maintain a good light transmittance and increase the light intensity. Some cultivation techniques can also improve the lighting conditions in the shed, such as strawberries in the north-south direction, large row spacing and small row spacing in the same way, so that all rows can get better light conditions. It can also cover the plastic film or hang a reflective screen, which can reflect the light so that the reflected and scattered light near the ground can be enhanced by 50% to 70%, and the plastic film has a better heat preservation effect.

3. Artificial supplementary light

There are more overcast and rainy weather in winter and spring, coupled with the influence of the covering materials of the facilities, dust and dew on the greenhouse film, the lack of light in the greenhouse and the imbalance of light quality composition are very serious. At this time, artificial light replenishment is needed to help crops have sufficient light to carry out various physiological activities. Artificial light replenishment is the use of artificial light sources to simulate the effective wavelength of sunlight on plants and promote plant photosynthesis and other physiological functions. At present, there are four main types of strawberry supplementary light source, one is LED light emitting diode, the second is high pressure sodium lamp, the third is fluorescent lamp, the fourth is fluorescent lamp. Among them, high pressure sodium lamp can obviously improve the fruit quality of strawberry and promote the fruit to mature ahead of time, but the effect of increasing yield is general. On the other hand, LED light-emitting diodes can restrain the overgrowth, appear on the market in advance, and the effect of increasing production is obvious.

The above is the winter greenhouse strawberry how to fill the light introduction, hope to help you, want to know more related knowledge, please follow us.