In winter, tomatoes grown in greenhouses are used to improve the light conditions. It is difficult to reach the optimum level of light in the shed. Therefore, light conditions tend to be the limiting factor for the growth of tomato growth in greenhouses in the winter and early spring. Under the condition of insufficient sunshine, the implementation of weak light compensation management is the key to the high yield and high efficiency of tomatoes. Select suitable varieties Different tomato varieties have different adaptability to the greenhouse, and they should be selected to be resistant to low temperature, low light, strong adaptability, and resistant to gray mold, leaf mold, early blight, virus disease, etc. In the absence of hormones, access to high yield, high efficiency, and easy to manage. 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°C-17°C. If the temperature is too low, the tomatoes will stop growing, resulting in reduced yields. Therefore, in the case of snow, cooling temperature should be appropriate to increase temperature, is conducive to the growth and development of tomatoes. Control irrigation Sheltered tomatoes are generally not watered if they are not particularly dry. 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 to increase the light transmittance. Balanced fertilization Appropriate application of phosphorus and potassium fertilizers at the seedling stage to control 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 carried out by top dressing, and 0.3% urea can be added with 0.1% potassium dihydrogen phosphate solution or 1% superphosphate calcium leaching solution to promote fruit ripening.
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