At the moment, the shed period is about to come. Some sheds have been planted with leafy vegetables, and some sheds have not yet been pulled out. Many vegetable farmers do not know what to do during the shed period, which may adversely affect the production of sorghum vegetables. During the break, the following issues should be noted:

Question 1: Planting is not scientific

Phenomenon: In some places, it is planted around August every year. By the end of June of the second year, the shed has only been idle for more than a month, and the rest period is very short. There are also many farmers who use this time to plant a summer leafy vegetable, such as sage, spinach, etc., which will be used this month.

Analysis: The shed is planted all the year round, there is no rest period, and the harm is a lot. First, the pests and diseases in the shed are aggravated. The pathogens always have hosts, and the environmental conditions are suitable. The survival rate of pathogenic bacteria in the soil will increase greatly. Second, there is no rest period, which makes the application time of the base fertilizer short and the soil conditions deteriorate rapidly. The dry chicken manure and rice husk, which are the most used by the current farmers, are mostly unfertilized or incompletely cooked, which aggravates the burned roots. The chance is beneficial to the root disease infection.

The correct way: Every summer is the best time to deal with the soil, the vegetable farmers should grasp this critical period, thoroughly disinfect the shed, apply the base fertilizer, and lay a good foundation for the production of sorghum vegetables.

The shack can kill a large number of pathogens in the shed, including fungi, bacteria, nematodes, etc., reduce the occurrence of diseases, and is conducive to the growth of vegetables. It is a low-input and effective sterilization method. In the greenhouses where there are dead trees in previous years, you can use dead vines.

Question 2: The shack is unreasonable

Phenomenon: When the vegetable sheds in the high temperature, many vegetable farmers cleaned the sheds and closed the sheds. It will be fine until the new seedlings come. This method of shacking is problematic.

Analysis: Vegetable farmers have been busy planting vegetables for nearly a year, and finally can rest after the summer break period, coupled with high summer temperatures, especially in the shed, it is unbearable, so the vegetable farmers are not willing to go to the shed, the farming operation The simpler the better, such as closing the vents when the temperature is high. This can indeed kill pathogens and eggs that remain on the surface of the soil, but what about the problems in the deep soil?

The correct approach: vegetable farmers can use a combination of dry stuffing and wet stuffing. After the garden is removed, a large number of germs and eggs are concentrated on the surface of the soil, columns and walls. At this time, the vents are closed and the repaired shed film is damaged, and the high temperature shack is carried out. The temperature of the shed can exceed 60 ° C and maintain the number. In an hour, most of the pathogens in the shed can be destroyed within a week. This is what we call dryness.

This method is simple and easy, and is a common measure adopted by vegetable farmers. However, this is not the case of high temperature shacks. This method can only kill the pests on the surface of the shed, so it is still necessary to combine wet and suffocate to achieve comprehensive sterilization and pest control. Complete purpose.

After boring, the soil should be turned deep by 30 cm. If it is not deep-turned and the rotary tiller is used to turn the ground, it will cause sterilization and a small range of insects. It is difficult to kill the deep bacteria and nematodes in the soil. Then, the shed is flooded, and the thermal conductivity of the water is higher than that of the soil to ensure that the soil tillage layer reaches a higher temperature.

Cover the mulch after irrigation for another 10-15 days of suffocation. If there are conditions, it is also possible to dig trenches when turning over the ground, and apply wheat stubble or wheat straw in the ditch, especially for sheds with soil compaction and severe salt damage.

Question 3: Qingyuan is not correct

Phenomenon: Many vegetable farmers save the problem by simply cleaning out the stems of the plants, and a large number of roots still remain in the soil, which is potentially harmful. Especially in the case of heavy planting, it can be said to be taboo.

The main purpose of the vegetable farm clearing garden is to clean up a large number of pathogens that may be carried by the previous vegetable, and the root system is the main carrier of blight, bacterial wilt, root rot and root-knot nematode. This makes the effect of the Qingyuan garden greatly reduced. It can be said that it has left the "bane" of high incidence of root diseases.

Analysis: In recent years, the occurrence of pests and diseases in greenhouses is on the rise. The pathogens and eggs of these diseases are mostly overwinter in summer.

At present, the three most serious pests in the shed are thrips, whiteflies and mites. After the shed, the locusts and other pests are mostly hidden in the soil or dormant, and the adults, eggs, etc. fall to the ground or enter the soil. The residual plant residues in the soil provide great convenience for their survival.

There are more than 50 kinds of diseases that occur frequently on vegetables and are more harmful. Most of the diseases can be transmitted through the soil. The pathogens depend on the diseased bodies in the soil. When the next vegetable is planted, this is the initial infection of the disease. Sources, especially various root rots, stem-based rot, bacterial wilt, blight, and root-knot nematodes have already occurred in the sheds, and the roots must be thoroughly cleaned.

Taking root-knot nematodes as an example, it is a good time to eliminate root-knot nematodes when pulling out the garden. You can use this opportunity to bring the root-knot nematodes attached to the roots out of the shed, and the remaining part will reuse the high-temperature shack or pharmacy. Treatment, easy to kill root knot nematodes, enhance control effects.

There are fewer plant residues in the soil, and the number of pathogens attached to it is naturally reduced, which greatly reduces the chance of infection of pests and diseases of the lower crops. The removal of roots in the soil after planting the garden can also reduce the amount of self-toxic substances in the soil and reduce the risk of heavy mites.

The correct way: leave 10-20 cm of stalks when pulling out the garden, first clean up the trees, mulch, weeds, etc., then immediately dig out the roots with iron shovel, collect them and take them out of the shed for deep burial. Root cleaning should not be delayed for too long to prevent some roots from decaying and remaining in the soil.

Then use high-temperature shacks or fumigation of chemicals to maximize the killing of pathogens, especially where dead trees, root-knot nematodes, etc. occur, and focus on the treatment, minimize the number of pests and grasses, and reduce the number of vegetables. Threat.