Onions and onions are growing as a spice crop. In the production of onions and onions, due to the improper selection of herbicides, the seasons are reduced or the harvest is not harvested. In the pollution-free production of onions and onions, it is very important to use herbicides.
When onion is planted, 50% of the water can be sprayed with 50% to 60 kg of water per acre. When the onion seedlings are cultivated, 33% of the herbicide per 100 mu of emulsifiable concentrate can be used, or 48 ml of 48% dilute emulsifiable concentrate per acre, or 50% of the herbicide can be used for 150 g of the wettable powder of 50% per acre. spray.
Before the onion is transplanted after the soil preparation, it can be used with 24% of the fruit, 66-72 ml per acre, or 43% of the grass with 80% of the grass, and spray 50-60 kg of water. Before transplanting the onion, it can use 100% 150ml of Fluorin EC or 200ml of 48% dilamine per acre, or 50% Dahui Wettable 100 per acre. -150 grams, spray 50-60 kg of water.
After the onion is planted at the 3-4 leaf stage, 24% of the fruit can be used for 66-72 ml per acre, or 43% of the grass with 80% to 100 ml of dry grass, and 50-60 kg of water. After the onion is transplanted, it can be used with 33% weeding emulsifiable concentrate 100-150 ml per acre. Or use 50% Liguron WP 100g per acre and spray 50-60kg of water.
In order to improve the effect of applying herbicides on onions and onions, it should be noted that the seedlings should be applied before emergence after sowing. After transplanting, the weeds should be applied before emergence of the seedlings. Onion is prohibited in the 2 leaf period, and the fruit is used carefully before the 3 leaves. When the temperature is low, apply it at noon on a sunny day, and apply it in the morning or afternoon when the temperature is high. Sandy soil should not be applied to the grass. (snow summer)
Sandwich Panel
What are the methods for judging the pros and cons of sandwich panel?
The material of the sandwich panel directly affects the later use. Sandwich panels are the main building materials for Prefabricated House and Steel Structure Warehouse. If you want to choose high-quality panels, you must have an understanding of their basic quality. There are many types of boards on the market, and their core materials, steel plates, adhesives, etc. are different, and the quality will also be affected. So how to judge its pros and cons?
check edge
Because the sandwich panel has several layers, it is difficult to judge its internal quality from the surface. Therefore, it is still necessary to observe its exposed edges first, and it is necessary to pay attention to whether its cross-section is clean and ensure that it is tight. If there are problems such as graying and impurities, then there must be problems in quality, so it is still necessary to do a good job of cross-sectional inspection.
Tap to hear the sound
If it is a relatively good board, you can simply tap it with your fingers. If the sound is a crisp metallic sound, then it is a relatively good board. The fire rating of the Rock Wool Sandwich Panel is Class A, and the fire rating of the polyurethane sandwich panel and Eps Sandwich Panel is B1.
Note the thickness
The thickness of the sandwich panel directly affects the long-term use in the later period. It is necessary to observe the substrate, peritoneum, etc., especially the thickness and quality of the coating, which we cannot ignore. It is necessary to choose a plate with a relatively thick coating and guaranteed quality. Generally, the thickness of the substrate should be about 0.4-0.8MM. If you see the real thing, you should also measure it. The thickness of the finished product is 50mm, 75mm, 100mm, 150mm. The bulk density of the core material is also an important link that affects the quality.
certificate
In fact, as long as it can cooperate with regular manufacturers, the plates sold by the manufacturers need to go through various inspections, and the quality must meet the regulations. Therefore, when purchasing, you can directly check whether it has a certificate of conformity. If you choose a plate from a regular manufacturer, you can not only enjoy a preferential price for direct sales from the manufacturer, but also enjoy good after-sales service.
Now there are many manufacturers supplying plates, and the market quotations and quality of each manufacturer are also different, so it is still necessary to do a good job of quality comparison and price measurement. It is suggested that when purchasing sandwich panels, one must pay attention to its specific quality, and compare the quality of the actual products in order to select high-quality panels.
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Henan Jinming Metal Material Co., Ltd. , https://www.hnjmsteel.com