Due to factors such as temperature, humidity, and improper management, tomatoes in greenhouses are prone to appear stiff fruit, empty spikes, and hollow fruit. To achieve high yield and high efficiency, in addition to cultivating strong seedlings, rational fertilization, and strengthening temperature and humidity management, some skills are needed.
The first is to remove the first flower of each spike, with more flowers, early fruit thinning, and good fruit retention. The first flower should be removed in time. Each flower can be 6 to 8 flowers. When the tomato grows to the size of the pigeon egg, the deformed, wounded, diseased and oversized fruit are removed, and the remaining fruit per ear is 3- Five are appropriate.
The second is to master the time and medication. It is easy to form a dead fruit if you spend it too early, and it is not easy to set fruit or split fruit if it is too late, which will affect the commerciality. The flower on each ear starts from the second flower (the first flower is thinned out), and basically every time two to three flowers open on the same day. The time is best when the flowers just open in the morning. For the concentration of point anthers, the preparation concentration should be higher at low temperatures and slightly lower at high temperatures.
The third is that the fertilizer and water in the fruit expansion period should be sufficient. The size of tomato and walnut is the period of fertility. At this time, the fertilizer and water must be sufficient, otherwise stiff fruit, small fruit, hollow fruit, etc. are likely to occur, affecting the quality. Based on the application of sufficient bio-organic fertilizer, the base fertilizer is applied with a quick-acting and long-acting full-nutritional balanced compound fertilizer. According to the number of ears of long fruit, determine the amount and type of topdressing fertilizer, and focus on the output of topdressing fertilizer. If a total of 6 ears are left, topdressing can be performed 3 times when the first, third, and fifth ears are enlarged; if a total of 4 ears are left, topdressing 2 times when the first and third ears are enlarged; fruit load When it is large, you can increase the dressing once. The top dressing is mainly potassium sulfate-based instant soluble and quick-acting compound fertilizer. The formula is preferably medium nitrogen, low phosphorus, and high potassium. The dosage is 20 kg / mu. In the late growing period, when the ground temperature is low, it can be better applied with fertilizers containing humic acid or amino acids to buffer the effects of pure chemical fertilizers on ground temperature and root system. At the same time, pay attention to the application of root fertilizer with water about 60 days after planting. It is recommended to apply 10 to 15 kg of humic acid or amino acid-containing liquid fertilizer per acre. High nitrogen fertilizer should not be used for topdressing to avoid drastic changes in soil wetness and dryness. At the same time, spraying with full-nutritional foliar fertilizer can avoid plant deficiency. It is best to stop watering and fertilizing when the penultimate ear starts to change color, in order to facilitate coloring and fruit expansion.
The fourth is to pay attention not to excessive leaf picking. During the fruit color changing period, many vegetable farmers removed all the leaves from the lower part of the ears in order to promote the fruit color change and increase the light. Some people also removed many leaves from the upper part. , Leading to the appearance of hollow fruit. Therefore, pruning and defoliation in the middle and late stages of growth should be appropriate and not excessive.
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