How can greenhouse tomatoes survive the summer safely? With high-yield planting techniques

Tomato is one of the most common vegetables in life. It tastes sweet and sour and tastes refreshing. In order to enable everyone to eat tomatoes all the year round, more and more plants are planted in greenhouses. So how can greenhouse tomatoes survive the summer safely? With high-yield planting techniques.

First, how can greenhouse tomatoes survive the summer safely?

At present, the most effective cooling measures are shading, sunshade nets, cooling agents and other widely used, abnormal weather changes in summer, how to correctly use shading nets and cooling agents to avoid high temperature and avoid the environment of low light and high humidity, which is conducive to the growth of summer tomatoes.

At present, the sunshade nets on the market are mainly black and silver gray. Black shading net has high shading rate and fast cooling, so it is suitable for short-term coverage in fields that need fine management in hot summer, while silver-gray shading net has low shading rate, which is suitable for light-loving vegetables and long-term mulching. Summer tomatoes often use black sunshade nets.

2. High-yielding planting techniques of tomato in greenhouse

1. Variety selection

Select varieties with good early maturity, cold resistance, disease resistance, high yield, good marketability and long shelf life.

2. Soil preparation, fertilization and bed cultivation

Base fertilizer should be re-applied high-quality organic fertilizer, combined with the application of microbial agents and a small amount of chemical fertilizer. It is suggested that "Haizhuangyuan" bio-organic fertilizer 100-120kg should be applied per mu, combined with 40 kg+ of "Haizhuangyuan" organic-inorganic compound fertilizer 120kg. The base fertilizer is mainly applied deeply, turning 25-750px deeply and raking flat to make the bed. Tomato should be cultivated in high border, which is arranged into the shape of turtle back to avoid stagnant water in the root.

The advantages of this scheme are as follows: because the mineralization rate of organic fertilizer is slow, it will not lead to obvious accumulation of nitrate in the plant, at the same time, it is conducive to the formation of soil aggregate structure, improve soil water and fertilizer conservation capacity and buffer capacity, and enhance permeability. In addition, proper application of microbial agents can promote the reproduction of beneficial microbial community in the rhizosphere, inhibit the growth of harmful bacteria and enhance the disease resistance of tomato.

3. Disinfection of shed

The greenhouse should be disinfected before planting. 250g per mu of dichlorvos EC was mixed with sawdust, mixed with 2000-3000g sulfur powder, ignited in 10 places, sealed for one day and night, and planted when the air was tasteless.

4. Time and method of planting

Tomatoes can be planted at the end of early February and the beginning of mid-February. When planting, the bidynamic bacterial fertilizer of "Haizhuangyuan" was applied in the hole, which was helpful to prevent the occurrence of soil-borne diseases. The planting density of tomato is 2500-3000 plants / mu, depending on variety and soil fertility. After planting, "Haizhuangyuan" seaweed rooting agent + seaweed fungus should be irrigated immediately to activate the soil and promote root respiration. Then buckle the shed to raise the temperature in order to slow down the seedlings.

5. Fertilizer and water management in greenhouse

Before the first crop of fruit stands, there is no need for watering and fertilization, so as not to cause excessive vegetative growth and postpone reproductive growth. After the first crop of fruit is settled, combined with watering and topdressing, it is suggested that "Haizhuangyuan" concentrated seaweed fertilizer 16kg should be applied per mu. After that, each time it was picked, the fertilizer was applied once, and the excellent fruit of "Haizhuangyuan" double algae 15-20kg was applied per mu. Nitrogen fertilizer must not be applied partially, otherwise the stress resistance will be reduced and the quality of the fruit will decline. At the same time, foliar spraying "Haizhuangyuan" seaweed essence 2000 times liquid + "Haizhuangyuan" signal calcium 1000 times liquid, in order to improve fruit quality and prevent the occurrence of umbilical rot disease.

6. Flower and fruit protection and fruit thinning

When the temperature is lower than 15 ℃, tomato is easy to drop flowers and fruits, which affects the yield. Therefore, on the basis of ensuring the temperature, the flowering period can spray "Haizhuangyuan" flower and fruit abundant 800 times liquid to improve the fruit setting rate and prevent the flower from being unfruitful. If you hang too many fruits, you should also remove deformed flowers and deformed fruits in time, and it is appropriate to have 3-4 fruits per panicle.