Spring pests and more nursery to prevent
Improving the disease resistance of vegetable crops In the production of pollution-free vegetables, pest and disease damage is an inevitable problem. The first step is to start with cultivation and management, and to improve the health and disease resistance of vegetable crops through agronomic practices. 1. Selection of pest-resistant varieties: The selection of disease-resistant and insect-resistant varieties is the most economical and effective method for controlling plant diseases and insect pests. It is necessary to select new pest-resistant new varieties according to local conditions. To understand the market information and new scientific research results, new varieties of pests and diseases should be selected as soon as possible. 2. Cultivate strong seedlings: Disinfect seedling bed soil so as to be free from bacteria, insects and weed seeds. Nursery bed soil should use organic soils, nutrients, water conservation, fertilizer conservation and good permeability. Spring seedlings must be strictly controlled environmental conditions and seedling pests and diseases, and cultivate strong seedlings. 3. Grafting, disease prevention and seedling raising: Due to cucumber wilt disease, cucumber disease and eggplant root rot, eggplant wilt disease, etc. are caused by soil-borne diseases that are difficult to control, posing a great threat to vegetable production. To this end, cucumber, watermelon, and eggplant grafting and seedlings should generally be promoted. It can not only prevent diseases, but also increase plant growth and stress resistance and increase yield and quality. Problems to be paid attention to when grafting and raising seedlings: First, choose the type of stock. Cucumbers, melons, and bitter gourds generally use black-skinned pumpkin as rootstock. The rootstock of eggplant is generally selected as the rootstock in China. The second is to coordinate the seeding period of the rootstock and scion, mainly the stock size of both the rootstock and the scion is not different, and the survival rate of grafting is guaranteed. Eight methods for the prevention and control of pest-free vegetable pests First, pests are treated with ash liquids. Per acre with 10 kg of plant ash immersed in water 50 kg soaked for 24 hours, take the filtrate spray can effectively control aphids, yellow pests. If the appropriate amount of trichlorfon is added to the grass ash liquid, the contact and fumigation of the liquid can be enhanced. If the onion, garlic, leeks are harmed by fly maggots, spreading 30 kg of plant ash per acre, both the treatment of maggots and increase production. The second is urine-washing mixture. Use detergent powder, urea, water as 1:4:400 ratio of water agent, control of scorpion, the insecticidal rate of 90% or more. The third is brown sugar liquid to prevent diseases. Take 300 grams of brown sugar dissolved in 500 ml of clean water, add 10 grams of yeast, placed in a greenhouse or greenhouse, stir once a day, fermentation for 15 days to 20 days until the surface of the white film layer, the fermentation broth added to the vinegar 100 grams of shochu, 100 kilograms of water, once every 10 days, and even 4 to 5 times, to prevent and treat cucumber bacterial leaf spot and gray mold. Fourth, DT fungicides prevent diseases. Prevention of cucumber bacterial keratoses, before the onset or early onset, spray DT fungicide 500 times, 75 kg per mu, spray once every 10 days, 3 times in a row. Prevention of Verticillium wilt on eggplant After the eggplant is planted and replenished, 250 g of liquid is used for 250 g, and once every 7 days, it is fed twice. The fifth is anti-dryening disease prevention and control. Anti-Kun Ning is used to control cabbage, pepper, tomato, celery, lettuce and melon wilt, leaf spot, and blight. More than 95% control effect. Spraying, irrigating, and soaking can all be used. Spray 20 kg per 20 ml of water and spray 3 times during the whole growth period. Irrigation can be diluted with 20 kg of water per 20 ml. Soak seed 15 kg per 20 ml of water, soak for 12 hours, remove and wash and dry after sowing. Sixth, vegetable Fengning disease prevention and control. The drug has a 90% control effect on soft rot of vegetables such as Chinese cabbage, potato and radish, and is generally sprayed on 1 bag per mu. Seventy is 8010 bacteria powder pest control. The bio-pesticides are highly efficient and non-toxic, and can be used to spray 400 kg of water per 500 g when used. They can control Pieris rapae, Plutella xylostella, and control efficacy of more than 95%. Eighth insecticide is the No. 6 liquid of the insect pest. Each bottle of 25 ml, when used diluted 500 times, can control cabbage caterpillar, diamondback moth, aphids, Spodoptera litura and other pests.
Steel Grating
The steel grating be welded to products . Normally, hot galvanizing will be carried out after end welding process. The range PH6 to PH12.5, a stable protective film will be formed on the zinc surface, the hot dipped galvanized steel grating has good anti-corrosive property. Of course, the steel grating also have other surface treatment, for example painted and powder coated .
Steel grating can be cutting to different kinds of shape as per your special needs.
Steel grating including flat grating, 'I' shape grating, serrated grating.
In generally , the steel grating be used as stair tread, platform, fence, trench cover, ceiling, etc.
The advantage of steel grating :
firm welding
smooth surface
high strength
Steel Grating,Stainless Steel Grating,Galvanized Steel Grating,Hot Dipped Galvanized Steel Grating
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