The direct cause of “hollow fruit†in winter is the temperature drop of water in the greenhouse. At low temperatures, the roots of the tomatoes are cold and shrinking, the roots have to be reduced in vitality, and the water absorption is poor. In this case, the young fruit is in an expanding stage, and there is a short-term shortage. In the case of water supply, it is easy to appear in the local fruit and meat scene. Therefore, the temperature of tomato watering greenhouses in winter must be raised by 10°C in advance. Temporary storage of water can be used in the corner of the greenhouse to facilitate warming.
Improve lighting management. In the middle and late stages of growth, it is appropriate to take a nap and pick the leaves, strengthen the light, and increase ventilation. It is usually the result that after the fruit on the branch is picked, the side branches below it are to be promptly knocked out to ensure the nutrient supply of the fruit setting branches, and the entire leaves below the result branches are removed. The leaves on the ear cannot be removed to ensure that the upper layer of fruit develops well. If there is not enough light, artificial lighting can be compensated.
Strengthen temperature management. The daytime temperature is controlled at about 25°C-30°C, and the night temperature is at 15°C-20°C to prevent the seedlings from growing. Tomatoes are sensitive to temperature during flowering, especially 5 days before flowering and 3 days after flowering. Less than 15°C or higher than 30°C is not conducive to flowering and pollination. In the result period, the temperature is controlled at about 25°C during the day and about 15°C at night.
Reasonable moisture management. Under the premise of ensuring normal growth, water control is the main method. Before flowering, the water maintains the degree of moderate humidity, soil moisture content of 65% -75%, the soil should be maintained in the result period of moist, soil water content between 75% -85%. Usually when the tomato grows to the size of the walnut, it will start to water and fertilize, and it will be able to apply organic fertilizer or compound fertilizer with the water. Later, depending on the growing condition of the plants and the meteorological conditions, picking a tomato and pouring a fertilizer.
Rational fertilization. To make up for a large number of elements, nitrogen, phosphorus and potassium fertilizers are mainly composed of nitrogen and potassium components, and the vegetative growth and reproductive growth of the plants are well coordinated. Basal fertilizer is usually applied at a rate of 4,000 kg per hectare of compost heap fertilizer, 40 kg of compound fertilizer, and 30 kg of superphosphate. Top dressing should be applied thinly before fruit setting, re-applied after fruiting, and top-dressing.
Reasonably apply hormones. When flowering results, it is necessary to increase the ability to pollinate and fertilize as much as possible so as to form seeds, and artificial pollination can be carried out conditionally. On the day of flowering or 1-2 days before and after flowering, depending on temperature conditions, 15-20 mg/kg of anti-dropping agent is usually applied to avoid fruit drop.
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