Techniques for High yield of large Fruit Tomato in greenhouse

Tomato in greenhouse is prone to the phenomenon of stiff fruit, empty ear and hollow fruit due to the influence of temperature, humidity and improper management. In order to achieve the goal of high yield and high efficiency, some skills are needed in addition to cultivating strong seedlings, reasonable fertilization and strengthening the management of temperature and humidity.

One is to remove the first flower per panicle, more flowers, early thinning fruit, leaving good fruit. The first flower should be removed in time, and 6-8 flowers can be counted per panicle. When the tomato grows to the size of pigeon eggs, the malformed, damaged, diseased and oversized fruits should be removed, and 3-5 fruits should be left per panicle.

The second is to master the time and dosage. Lighting flowers too early is easy to form stiff fruit, too late, it is not easy to set fruit or form split fruit, which will affect the commodity. The flowers on each ear start from the second flower (the first flower is thinned), and 2-3 flowers bloom on the same day each time. It is best to light flowers at this time. The best time is when the flowers are just opening in the morning. For the concentration of anther, the concentration should be higher at low temperature and slightly lower at high temperature.

Third, during the fruit expansion period, there should be enough fertilizer and water to meet the fruit expansion, increase production and increase efficiency. Tomato walnut size is the peak period of fertilizer, at this time, fertilizer and water must be sufficient, otherwise it is easy to appear stiff fruit, small fruit, hollow fruit and so on, affecting the quality. On the basis of the application of sufficient bio-organic fertilizer, the base fertilizer was applied with quick-acting and long-term total nutrient balanced compound fertilizer. According to the number of panicles of long fruit, determine the amount and type of fertilizer topdressing, focusing on the yield of topdressing. If a total of 6 ears were left, topdressing could be applied 3 times when the first, third and fifth ears were enlarged; if 4 ears were left, topdressing was applied twice when the first and third panicles were enlarged, and when the fruit load was large, topdressing could be increased once. Topdressing is mainly potassium sulfate type instant compound fertilizer, the best formula is medium nitrogen, low phosphorus and high potassium, the dosage is 20-30 kg per mu. In the later growth stage, when the soil temperature is low, it is better to apply fertilizer containing humic acid or amino acid to cushion the effect of pure chemical fertilizer on soil temperature and root system. At the same time, attention should be paid to adding root water again about 60 days after planting, and it is suggested that 10-15 kg of humic acid or amino acid liquid fertilizer should be applied per mu. Topdressing should avoid using high nitrogen fertilizer to avoid drastic changes in soil dryness and humidity, and at the same time spray imported fully nutritious foliar fertilizer to avoid plant deficiency. It is suggested that it is best to stop watering and fertilizing when the fruit of the penultimate ear begins to change color, so as to facilitate coloring and fruit expansion.

Fourth, pay attention to the late picking of leaves should not be excessive. In the fruit color conversion period, in order to promote fruit color conversion and increase light, many vegetable farmers removed all the leaves in the lower part of the ear, and some people also removed a lot of upper leaves, which will seriously affect the photosynthetic accumulation of leaves and lack of nutrition. leading to the appearance of hollow fruit. Therefore, in the middle and later stages of growth, forking and picking leaves should be appropriate and not excessive.