To solve the problem of pesticide effect, this is not just to see the effect of prevention and control. This is a problem that needs to be adhered to for a long time. To develop a “chain meter†for pesticides, the overall improvement of pesticide effect is the real bumper harvest.
First, reasonable air release to regulate light, temperature and humidity:
1. Uncovering the grasshopper: In principle, it is to release the grass in the morning, and in the morning, as long as the light can shine into the greenhouse, the grasshopper will be uncovered. When the temperature in the shed falls to about 20 degrees in the afternoon, the grass will be covered. Specifically, the temperature has been rising after the grasshoppers are opened, indicating that the grasshoppers are too late; when the grasshoppers are opened for half an hour, the greenhouse temperature is still falling, indicating that the grasshoppers are too early. Under normal circumstances, the shed temperature began to rise within half an hour after the grasshopper was opened. In the warm and sunny days, the night cover will be uncovered, and the early cover will be exposed in the cold and cold days. The cover will be exposed in the evening when it is cloudy. When the time is cloudy, it should be gradually uncovered to avoid flashing seedlings;
2. Time-controlled air temperature control:
In the morning, the first wind should be released after about one hour of uncovering the grass. It is not good for the crop to use the carbon dioxide accumulated in the evening to carry out photosynthesis and affect the formation of the production. It is too late, which is not conducive to temperature regulation. After that, the air release control is carried out according to the temperature requirements and actual changes in each period of the shed. Note that when the temperature in the shed is too high, it is forbidden to let the air release too large and the temperature drops too fast to avoid damage to the seedlings.
Second, water and fertilizer regulation and growth: about 5 days after planting, depending on the situation, determine the watering of the seedlings, the main point is to pour small water; try not to water the flowers in the early stage of the flowering, so as not to cause the cucumber to grow long; after sitting in the root melon, depending on the water, The relative humidity of the soil is required to be maintained at 80-90%, and the small water is poured. When watering the melon water, it can be applied for about 10 kg of urea. Later, in the principle of “less application of diligenceâ€, adopt “water-based fertilization†or “water and fertilizerâ€. In the early stage, nitrogen fertilizer was the main factor, and in the middle and later stages, phosphorus and potassium fertilizers, calcium fertilizers, zinc-iron-boron and other medium and trace elements were added, as well as organic fertilizers and biological fertilizers.
Third, the use of pesticides to control diseases: winter and Spring, when the temperature in the shed is below 20 degrees, the humidity is above 90%, the long-term comprehensive effects of poor lighting conditions, etc., often cause gray mold, powdery mildew, corner spots Diseases and downy mildew are often mixed. The principle of rational mixing and alternating use should be used to control the occurrence of diseases.
1, pyrimethanil + difenoconazole or ether phenol mixed, for gray mold and white powder, black star disease, etc. have control;
2, downy mildew hydrochloride + difenoconazole mixed, or dimethomorph + nitrile azole, have the same effect on downy mildew, white powder and black star disease;
3, enoylmorpholine + organic copper preparation, or dimethomorph + agricultural streptomycin (neucollin, Chunremycin can be), effective against downy mildew, keratin and other bacterial spot disease;
4. When the pests and diseases have already occurred, select one of the above formulas for sterilization according to the main disease type, spray the ether fungus esters every 3-5 days, and then spray another one of the above formulas every 5-7 days. This is used interchangeably. When no disease occurs, spray the medicine every 7-10 days; when the disease occurs, the spraying time is shorter, and the prevention and treatment are alternately matched.
Through the comprehensive application of the above three measures, it is believed that greenhouse crops will grow robustly, stabilize production and increase production.
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