The application time of farmyard fertilizer is slow, and should be applied early. Generally, it is applied once before sowing. However, the amount of chemical fertilizer is small, and the effect is quick. Generally, it should be applied about 7 days before the peak of nutrient absorption.
Application method Farmyard manure should be combined with deep tillage into the soil tillage layer, or combined with ridges to buckle into the ridge bottom. 30% of the nitrogen fertilizer used in combination with farmyard manure is used as the base fertilizer, 70% is used as top dressing, and phosphate fertilizer and potash fertilizer are applied as base fertilizer at one time.
The application of quantitative fertilizers and farmyard manure application should be different according to the different crop and soil fertility. For example, if corn is planted on a thin ground, 4 cubic meters of farmyard manure, 24 kg of urea and 13 kg of phosphate fertilizer can be applied per acre, or Apply 15 kg of compound fertilizer 15-15-15. Medium-fertile soil can be applied to farmhouse manure 3 cubic meters, urea 20 kg, or 15-15-15 compound fertilizer 12 kg. High-fertility soil can be applied to farmer's fertilizer of 2.5 cubic meters and urea of ​​15 kilograms. Among them, urea is better applied when topdressing, and compound fertilizer is better as base fertilizer.
Ductile cable manhole covers are a type of access cover that is specifically designed to provide a secure and durable solution for underground utility access points. These covers are made from ductile iron, which is a type of cast iron that has been treated with magnesium to enhance its strength and ductility.
Ductile iron is known for its excellent mechanical properties, including high tensile strength, impact resistance, and flexibility. These properties make it an ideal material for manufacturing manhole covers that can withstand heavy loads and harsh environmental conditions. Ductile cable manhole covers are specifically designed to accommodate cables and wires that pass through underground utility access points.
One of the key features of ductile cable manhole covers is their high load-bearing capacity. These covers are able to withstand heavy loads, such as vehicles driving over them, without experiencing any deformation or damage. This is crucial for ensuring the safety of pedestrians and vehicles, as well as preventing any disruption to the underground utilities.
In addition to their load-bearing capacity, ductile cable manhole covers also offer excellent resistance to corrosion and wear. The ductile iron material is highly resistant to rust and can withstand exposure to moisture, chemicals, and other corrosive agents. This ensures that the covers remain in good condition for an extended period of time, even in harsh environments.
Furthermore, ductile cable manhole covers are designed to be easy to install and maintain. They typically feature a hinged design, allowing for easy access to the underground utilities. This makes it convenient for utility workers to carry out inspections, repairs, and maintenance tasks without the need for specialized tools or equipment.
Another important aspect of ductile cable manhole covers is their anti-theft features. These covers are often equipped with locking mechanisms or tamper-proof features to prevent unauthorized access or theft. This is especially important in areas where the underground utilities are valuable or sensitive, such as power distribution networks or telecommunication infrastructure.
Moreover, ductile cable manhole covers are designed to be aesthetically pleasing. They often feature a smooth and sleek surface finish, which not only enhances their visual appeal but also prevents debris or water from accumulating on the cover. This helps to maintain a clean and tidy appearance in urban areas.
In conclusion, ductile cable manhole covers are a reliable and durable solution for underground utility access points. Their high load-bearing capacity, corrosion resistance, and anti-theft features make them an ideal choice for ensuring the safety and functionality of underground utilities. With their easy installation and maintenance, as well as their aesthetically pleasing design, ductile cable manhole covers are a practical and efficient solution for various infrastructure projects.
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