In wheat fields, the timing of herbicide application is critical for effective weed control and crop safety. Many farmers tend to apply herbicides in spring, waiting until weeds have matured and their density has increased. However, this approach often leads to reduced effectiveness because older weeds develop greater resistance. As a result, higher herbicide doses are required, which not only increases costs but also raises the risk of phytotoxicity to wheat plants and nearby crops. For example, using 48% chlorpyrifos or 2,4-D during the grain-filling stage of wheat can prevent seed formation. Based on years of research and field experience, it is recommended that herbicides be applied before winter. This usually means applying pre-emergence herbicides just before wheat emergence or using post-emergence herbicides when wheat has 2–4 leaves.
Selecting the right herbicide is equally important. Different herbicides target different weed species. Some have a narrow spectrum, such as those that only control wild oats. Others, like dimethyltetrachloride, work well against certain broadleaf weeds but are less effective against others. Similarly, 2,4-D is effective against broadleaf weeds but not grasses. Farmers should choose herbicides based on the dominant weed species in their fields to maximize effectiveness. Products like fluroxypyr, clethodim, and bensulfuron-methyl are effective against broadleaf weeds, while metsulfuron-methyl and chlorsulfuron are suitable for rice-wheat rotations. Using them in other crops like cotton, corn, or peanuts can lead to serious phytotoxic effects, causing significant damage.
Controlling the amount of herbicide is essential to avoid harming the wheat. Herbicides are not always selective, so over-application or under-application can be harmful. It's crucial to follow the dosage instructions provided by the manufacturer and adjust according to local conditions. Soils with high organic matter and fine texture tend to adsorb more herbicides, reducing their availability and requiring higher application rates. In contrast, sandy loam soils allow herbicides to remain active longer, increasing the risk of toxicity, so lower doses may be needed. Alkaline soils can also affect herbicide stability, making them more persistent and potentially damaging to crops. Therefore, herbicides should be applied early in such conditions and with caution.
Temperature and humidity also play a key role in herbicide performance. According to the Chinese Pesticide Network, low temperatures can reduce the efficacy of some herbicides. For instance, 2,4-D and metolachlor perform poorly below 10°C, while they become more effective at higher temperatures. Some herbicides, like the "Superstar" type, show delayed effects at low temperatures, taking up to 30–40 days to work. Thus, it's best to apply herbicides on warm, sunny days to ensure optimal results. Soil moisture is another important factor. Adequate moisture helps herbicides work more effectively, especially when applied before wheat emerges or during the growing season. Moist soil enhances weed absorption and improves the overall herbicidal effect.
Finally, proper spraying techniques are essential. Herbicides must be diluted properly and mixed thoroughly to ensure even coverage. Avoid heavy spraying or missed spots. If neighboring fields contain sensitive crops, protective measures should be taken to prevent drift caused by wind. It’s advisable to use dedicated herbicide sprayers to avoid cross-contamination. If this isn’t possible, equipment must be thoroughly cleaned with bleach after herbicide use before applying other pesticides. These precautions help maintain both crop health and environmental safety.
Steel Structure Workshop
These points cannot be ignored in the construction of steel structure workshop
The cost of the steel structure factory building is low, and the construction efficiency is high. It only needs to complete the basic design, and the construction can be completed immediately, and the factory building can be put into use quickly. However, when building a factory, we still have to pay special attention to the following points.
simple design
Different from other buildings, the steel structure factory building should still have a simple shape, generally designed as a rectangle, so that it is more convenient to use later and can also ensure the internal space. The layout can be carried out according to the terrain of the site, and attention must be paid to the specific design location of the workshop and whether there is a certain functional area division. Generally, the terrain slope of the factory building should not be greater than 5%, and the hilly slope should not be greater than 40%. Therefore, the construction should be carried out according to the local conditions, and the slope should be reasonable.
Construction location confirmation
As far as possible, the factory building should avoid locations such as earthquake faults, especially some locations prone to mudslides and landslides are not suitable for building factory buildings. If it is a valuable mining area, ancient tomb, etc., try not to build factories, etc. Before the construction of the factory building, it is necessary to do a good on-site inspection. If the local area is not suitable for the construction of the factory building, try to choose another place, so as to avoid the need to relocate the factory building later, which will be more troublesome and waste time and construction costs.
Reserved land for expansion
Steel structure workshops are very easy to expand, because with the increase in later construction requirements, many workshops may need to be expanded. Therefore, at the beginning of construction, a place for expansion should be reserved. At least the process requirements, transportation requirements, and whether there are other plant constructions should be considered.
Pay attention to construction inspection Steel Structure Workshop and Steel Structure Warehouse are relatively easy to construct and construct, so it is still necessary to pay attention to the need for safety personnel to inspect the site, and report in time if there are some installation problems. Moreover, after the construction is completed, there must be a construction inspection, and the stability of the plant must be ensured, so as not to affect the later use of the plant.
It is only necessary to select the appropriate materials for the construction of the steel structure factory building, and choose a suitable construction location, then basically the construction of the factory building can be completed immediately, and the factory building can also be quickly put into later use.
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