Greenhouse tomato weak light compensation management

In the production of tomatoes in winter greenhouses, no matter how to improve the lighting conditions, it is difficult to reach the appropriate level of light in the greenhouse. Therefore, the light conditions are often the limiting factor for the growth and development of tomatoes in winter greenhouses. Under the condition of insufficient light, the implementation of low-light compensation management is the key to the high yield and high efficiency of tomatoes. The main management measures are:

Select suitable varieties

Different tomato varieties have different adaptability to the greenhouse, and they should choose varieties that are resistant to low temperature, weak light, strong adaptability, and have certain resistance to gray mold, leaf mold, early disease, and virus disease, so that they do not use hormones. In the case of high yield, high efficiency, and easy management.

Appropriate increase in temperature

During the growth of tomato fruits, the daytime temperature can be controlled at about 25°C, and at night it is best controlled at 15-17°C. If the temperature is too low, tomatoes will stop growing, resulting in reduced yields. Therefore, in the case of snow cooling weather should be appropriately warmed, is conducive to the growth and development of tomatoes.

Control irrigation

Greenhouse tomatoes are generally not watered if they are not particularly arid. If water is poured, it must be done on a sunny morning. Too much irrigation, soil moisture and air humidity are relatively large, such as the case of continuous snow days again, from light to reduce production, while the production will lead to failure.

Suitable sparse

When planting tomatoes, they should be sparsely planted and pruned in time to remove old leaves, diseased leaves, and light-blocking leaves in a timely manner to enhance the light transmittance.

Balanced fertilization

Appropriate application of phosphorus and potassium fertilizer at seedling stage to reduce the amount of nitrogen fertilizer, in particular, to control the amount of ammonia nitrogen. Nitrogen fertilizers need to be deepened to prevent ineffective evaporation. During the period of vigorous plant growth, nutritional supplementation can be performed by top dressing, 0.3% urea plus 0.1% potassium dihydrogen phosphate or 1% calcium superphosphate can be used to promote fruit ripening.

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