As the temperature decreases, the greenhouse heat preservation is covered, the ventilation decreases, and the humidity inside the shed increases significantly. Dew has become a long-standing problem in the shed, which is beneficial to the occurrence of downy mildew, gray mold and other moisture-loving diseases. When interviewing in greenhouses in many areas, the author found that vegetable farmers everywhere choose the latest drugs, but many diseases are incurable.
Diseases are the most important factor in reducing the yield of winter vegetables. It is too late to wait until the leaves are yellow. Prevention of the disease is the focus. By preventing it from spreading, you can save money and effort and increase production.
Prevent disease
1. Grasp the two key points in front of the shed and under the air outlet to find the disease early. Downy mildew, gray mold, vine blight, etc. are all moisture-loving diseases, which are mostly on the front of the shed when they start to occur; powdery mildew and some pests mostly occur first in places with large humidity changes or dryness, that is Under the tuyere. When you pull up the shed in the morning, you must first go to the front face of the shed and under the vents to see if there are any abnormalities in the upper and lower leaves, you can see if there will be diseases in the later stage.
There are many types of cucumber diseases, and medication should be taken early to prevent them. Generally, broad-spectrum fungicides can be used to protect the leaves, such as chlorothalonil, copper preparations, azoxystrobin, etc., once every half month. Once the disease occurs, it is necessary to immediately confirm the type of the disease, and use the medicine early to control the disease before it occurs.
Pay attention to spray method
First of all, we must use a sprayer with high pressure and good atomization to ensure that the leaves are evenly applied and the efficacy is the best.
Secondly, the leaves must be sprayed up and down, and the spray head can spray directly on the back of the leaf, and the droplets will naturally fall to the front of the leaf.
Again, do not mix pesticides randomly, especially fungicides and insecticides, and spray them separately.
Reduce air humidity and reduce disease occurrence
1. Watering should be carried out from under the mulch.
2. Choose a non-drip film with high light transmittance and good dripping properties.
3. Cover the face in front of the shed with plastic film.
4. The operation line spreads straw to absorb moisture to reduce humidity.
5. Ventilation in sections. Ventilation starts one hour after pulling the shed. From small to large, gradually open and close the air to ensure stable temperature and humidity changes.
6. Choose a sunny morning for spraying, unless spraying to control thrips and other day and night pests.
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Hydroponics is a subset of hydroculture, the method of growing plants without soil, using mineral nutrient solutions in a water solvent. Terrestrial plants may be grown with only their roots exposed to the mineral solution, or the roots may be supported by an inert medium, such as perlite or gravel. The nutrients in hydroponics can come from an array of different sources; these can include but are not limited to waste from fish waste, duck manure, or normal nutrients.
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