How to manage greenhouse vegetables in rainy season?

With the arrival of the rainy season, there is more rain this year, and even extreme weather has happened a lot. In this case, it will bring some difficulties to the cultivation and management of greenhouse vegetables. How to manage greenhouse vegetables in rainy season? To solve this problem, we must first understand what the weather is like after the rainy season. What adverse effects will it have on the growth of greenhouse vegetables? Knowing this, the management of vegetables in our shed becomes simple.

What are the characteristics of rainy season weather? What adverse effects will it bring to greenhouse vegetables?

After entering the rainy season, the influence of rainy season weather on greenhouse vegetables mainly includes the following aspects:

1, is there much rain? Rain enters the hut.

After entering the rainy season, whether it is rain or hail, the probability of rain entering the shed will increase. Growing vegetables in greenhouses is most afraid of rain, which is different from growing vegetables in the open field. On the one hand, it leads to the destruction of soil structure; On the other hand, it leads to the occurrence of soil-borne diseases. Especially in hot and rainy weather, the most likely cause is Phytophthora root rot.

2. How many cloudy days are there? Insufficient organic nutrition

On cloudy days, when the light is insufficient, the photosynthetic products produced by vegetable photosynthesis will decrease and the organic nutrition will be insufficient. For example, there will be a series of premature aging problems such as slow expansion of tomato fruit, sharp mouth of cucumber, big head melon and bulging of beans.

3. Is it sunny after rain? Withering, sunburn, etc.

The sudden clearing after the rain has the greatest impact on greenhouse vegetables. The main symptoms of plants are: root weakness caused by hypoxia; Sunburn and gas injury caused by large transpiration and insufficient absorption of nutrients by roots; Umbilical rot caused by calcium deficiency and so on. But also aggravate diseases, especially hygrophilia.

As long as it rains, including extreme weather. Whether it is cloudy or sunny, vegetables and plants have the same performance, that is, the stress resistance of plants becomes worse. Then there will be a series of problems such as wilting, root rot, gas burning, sunburn, disease and so on.

How to manage greenhouse vegetables after bad weather?

After bad weather, how to manage the vegetables in the shed to make them grow again? We must first understand these fundamental problems, because this is the basis for us to solve them.

The first step: the aftermath is in place.

After bad weather, such as hail, rainstorm and strong wind, the first thing to do is to drain or clean up the litter in the shed. Whether it is leafy vegetables or fruit vegetables, the root system has a particularly strong respiratory function and a particularly high oxygen demand, and as long as the shed is flooded, it will affect the respiratory function. Therefore, as long as there is bad weather, the first thing to do is to do the aftermath.

Step 2: First, improve the resilience of vegetables.

To deal with the aftermath, we should first improve the resilience of vegetables, and don't wait for problems such as root rot and wilting of vegetable plants to take measures. After the first step, we will supplement vegetable plants with auxin and amino acids from plants. If vegetables are in the fruit-setting stage, we will also add a lot of elemental (nitrogen, phosphorus and potassium) fertilizers.

It is recommended to use 30 ml of plant-derived auxin and 50 ml of plant-derived amino acids. For fruits and vegetables in fruit-setting period or leafy vegetables in critical period, 70 g of water-soluble fertilizer (such as 20- 15-20) is added to the leaves and sprayed once every two days and twice continuously to improve the stress resistance of vegetable plants.

Step 3: Do a good job in disease prevention again.

When spraying fertilizer on the leaves for the second time, add fungicides to control the disease. In other words, the first foliar spraying improved the stress resistance and promoted the post-disaster recovery; The second foliar spraying can not only improve the stress resistance, but also prevent and control diseases at one time.

There are three kinds of diseases that need to be controlled: lower fungal diseases, higher fungal diseases and bacterial diseases. If vegetable farmers can distinguish which diseases are prone to occur, it is best to use drugs targeted. For example, tomato leaves are prone to disease after rain; Cucumber is prone to downy mildew and leaf blight; Eggplant is prone to cotton wilt and so on.

In the actual planting management, it is difficult for many vegetable farmers to know which diseases are prone to high incidence, and we can use the overall prevention plan to prevent them. Because no matter what vegetables are, they are nothing more than the three major diseases mentioned above. Recommended drug chunlei? Propamocarb 30ml+ benzene? 5 g dicyandiamide (difenoconazole+dicyandiamide anthraquinone compound) +20 ml water-soluble fertilizer containing amino acids and humic acid. If there is no disease in vegetable plants before bad weather, there will be no problem in using this scheme for overall prevention in the later period.

Step 4: For vegetables prone to root diseases, prevent root diseases and prevent seedlings from dying once.

After water infiltration, the root diseases that are easy to occur should be prevented once to prevent vegetable plants from dying. Common root diseases after bad weather mainly include: pepper, eggplant and other fruits and vegetables are prone to Phytophthora root rot; Vegetables just planted at seedling stage are prone to stem rot; Melons rot easily. Recommended medicine nail cream? 10ml of hymexazol+10/0ml of 30g of water+30g of Bacillus subtilis, which is mainly sprayed on the rhizome.

Step 5: supplement calcium while raising roots.

After bad weather, vegetable farmers are advised not to water or topdressing. For the cultivation of vegetables in the open field, we like to borrow rain to fertilize, but the cultivation management of vegetables in greenhouse is completely different from that in the open field. As long as we encounter bad weather, especially rainy weather, and the rain is heavy, the roots of vegetables and plants are prone to retting due to lack of oxygen. If we go topdressing at this time, it will aggravate the retting system and slow down the recovery of vegetables. Therefore, fertilizer must be controlled first after the rain, and nitrogen, phosphorus and potassium fertilizer must be stopped first.

While controlling nitrogen, phosphorus and potassium fertilizer topdressing, when the drained ground is dry, root fertilizer is applied by watering with a small amount of water. The weaker the root system is, the more difficult it is to irrigate with large amount of water, because the oxygen demand of the root system is high. For leafy vegetables, it is a little better. If it is fruits and vegetables, as long as it rains, you must first water and raise roots. An acre of land can irrigate about 2 liters of organic water-soluble fertilizer containing amino acids and humic acid, about 2~3 liters.

If you are still in the fruit-setting period or the peak period of fruit picking, add calcium fertilizer after rain to prevent sunburn, gas burning and navel rot. In hot weather, all vegetables like to supplement calcium, whether leafy vegetables or fruits and vegetables. When the weather is hot, the higher the temperature, the more calcium is needed.

When the weather is hot, vegetables grow fast, and the supply of calcium will not keep up; In addition, the root system of vegetables is weak after rain, and the ability to absorb calcium will also become weak. The absorption of calcium is absorbed through transpiration. Therefore, nitrogen, phosphorus and potassium are not necessarily added, but calcium fertilizer must be added. When watering, add 4 kilograms of chelated calcium fertilizer to an acre of land. This is just like us. It is a truth that when we sweat the most in summer, we need to add salt to replenish energy in addition to hydrating.

After understanding the adverse effects of bad weather in rainy season on greenhouse vegetables, through the targeted management of the above five steps, the growth of seedlings can be restored and diseases can be guaranteed.