After the rain, the temperature gradually increased and the temperature in the greenhouse was also high. The high temperature environment has a certain barrier effect on the growth of greenhouse vegetables, such as affecting the development of photosynthesis and the occurrence of various bacterial diseases. During this period, if you do not strengthen management, it will directly affect the growth of greenhouse vegetables, and will bring irreparable losses. Therefore, at present, we must focus on the management of ventilation in greenhouses, management after watering, and replenishment of vegetable nutrition to ensure healthy growth of greenhouse vegetables in high-temperature environments.

Reasonable release of air to ensure that the greenhouse "breathless"

Step-by-step ventilation When the shelter is covered for 1 hour or when the temperature of the shed reaches 20°C or so, a small breeze should be placed first. The air outlet is generally about 5 cm wide, and the photosynthesis of crops and the discharge of moisture or harmful gases are strengthened. When the temperature of the greenhouse rises to the upper limit of the high temperature required for the crop, one more wind is used to gradually reduce the temperature to a suitable range for vegetable growth.

When there is no wind or slight northeasterly wind (or southeast wind), the temperature at the western end of the shed is 2°C~3°C higher than that in the east half. When the wind is high, the east end is 2°C higher than the west end. When there is a northwesterly wind or a southwesterly wind, the temperature difference between the east and west ends will be above 3°C, and the larger the wind, the greater the temperature difference. In view of the above various conditions, the ventilation should adopt a method of segment management.

The temperature meter is set to be reasonable. The main reason for the farmer to release the wind is based on the reading temperature on the thermometer. The accuracy of the thermometer is directly related to whether the vegetables are in a suitable growing environment. Therefore, it is recommended that the vegetable farmer set up three thermometers evenly in the shed, and then take the average value to reduce the error, and it is advisable to place the lower end of the thermometer at 10 cm or more above the vegetable growth point.

Prevention of Bacterial Diseases After Water Management

Dehumidifying water immediately after watering At present, the temperature in the shed has risen quickly, the ventilation in the shed has gradually increased, and the humidity in the shed has been relatively small. However, after watering, the humidity in the greenhouse increases rapidly. Therefore, it is necessary to drain the water in a timely manner. In the afternoon of the watering, the air outlet can be closed at an appropriate time. At the same time, the air intake is opened early in the morning and the ventilation volume is increased. This operation continuously maintains 2~ In 3 days, the humidity in the greenhouse was quickly reduced to reduce the occurrence of diseases.

Pruning time to seize the opportunity to fight where the whole branch, or the end of the branch cracking, or over-operation, will lead to a large area of ​​the stem cut off. In this reminder vegetable farmers, in the pruning when you want to choose sunny, after watering within 1 to 2 days, try not to pruning, because after watering, plant water content, increased the probability of disease infestation.

After the pharmacological prevention and treatment of pruning and beating are strengthened, a protective agent and an agent for preventing and treating bacterial diseases shall be sprayed in time, and copper preparations such as copper, basic copper sulphate, and quinolinone may be applied. For plants that have already been infected, First remove the lesions, such as diseased leaves, young fruit, while the application of endostatin, kasugamycin, methamphetazole and other systemic agents with thiazole copper, quinolinone and other protective agents sprayed to prevent disease transmission.

Supplemental nutrition to meet the "need for growth" of vegetables

Rooting and protecting leaves to ensure the absorption of vegetables The current vegetable management should pay attention to raising the roots and protecting the leaves. Rooting must first ensure that there is a good soil living environment, reflected in the actual operation, can be based on the needs of different varieties of different growth stages of reasonable fertilization, and then cover the laying of the film instead of arch cover, increase soil permeability. For the maintenance of the leaves, for the vegetables in the middle and late stages of growth, the old and weak leaves should be removed in a reasonable and orderly manner to reduce the infection of pathogenic bacteria.

Under the spray of a full-blown fertilizer for the vegetables that have entered the results of the period, according to the law of their needs to provide a reasonable supplement nutrients, and spray under the combination of fertilization. When fertilizing melon vegetables, the main fertilizer is mainly balanced fertilizer. According to the law of fertilizer requirement of melon vegetables, the demand for potassium during flower and fruit period increases, so high potassium fertilizer can be interspersed. At the same time, when trace elements are lacking, it is recommended to use foliar spraying methods to facilitate rapid replenishment.

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