Tips for promoting high yield of tomatoes in greenhouses
Due to factors such as temperature, humidity and improper management, tomatoes in greenhouses are prone to stiff fruit, empty ears and hollow fruit. To achieve the goal of high yield and high efficiency, in addition to cultivating strong seedlings, rationally fertilizing, strengthening temperature and humidity management, some skills are needed.
One is to remove the first flower of each spike, more flowers, early fruit thinning, and good fruit retention. The first flower should be removed in time, and 6 to 8 flowers per spike can be spotted. When the tomato grows to the size of a pigeon's egg, the deformed, wounded, diseased, and oversized and undersized fruits are removed. 5 is appropriate.
The second is to master the time and dosage. It is easy to form a stiff fruit if the flower is too early, and it is not easy to sit or split the fruit too late, which will affect the commerciality. The flowers on each spike start from the second flower (the first flower is thinned out), and basically every time 2 to 3 flowers open on the same day. Time is best spent in the morning just after opening. For the concentration of anthers, the concentration should be higher at low temperatures and slightly lower at high temperatures.
The third is sufficient water in the fruit expansion period. The size of tomatoes and walnuts is a period of strong fat. At this time, fertilizer and water must be sufficient, otherwise stiff fruit, small fruit, empty fruit, etc., are likely to occur, which affects the quality. Based on the application of sufficient bio-organic fertilizer, the bottom fertilizer is a fast-acting and long-acting full-nutrition balanced compound fertilizer. According to the number of ears of long fruit, determine the amount and type of topdressing fertilizer, focusing on the production of topdressing fertilizer. If a total of 6 ears of fruit are left, topdressing can be done 3 times when the first, third, and fifth ears are enlarged; if a total of 4 ears of fruit are left, topdressing twice when the first and third ears are enlarged; fruit load When it is large, it may be appropriate to increase the top dressing once. The top dressing is based on potassium sulfate type instant compound fertilizer. The formula is preferably medium nitrogen, low phosphorus and high potassium, and the dosage is 20 kg per mu. In the late growth period, when the ground temperature is low, it can be better to apply fertilizers containing humic acid or amino acids to buffer the impact of the chemical fertilizer on the ground temperature and root system. At the same time, pay attention to the application of rooting fertilizer with water in the middle about 60 days after planting. It is recommended to apply 10-15 kg of liquid fertilizer containing humic acid or amino acids per mu. Avoid using high nitrogen fertilizer for top dressing to avoid drastic changes in soil wet and dry. At the same time, spray with total nutrient foliar fertilizer to avoid plant deficiency. It is best to stop watering and fertilizing when the penultimate ear of the fruit begins to change color, in order to facilitate coloring and fruit expansion.
Fourth, pay attention to the late leaf picking should not be excessive. In the fruit color-changing period, many vegetable farmers removed all the leaves at the lower part of the ear to increase the light, and some people also removed a lot of the upper leaves. Too few leaves will seriously affect the photosynthetic accumulation of the leaves and lack nutrition , Leading to the appearance of hollow fruit. Therefore, cutting and leaf picking should be appropriate in the middle and late stages of growth, and should not be excessive.