The use of ** and other liquid fertilizers containing various nutrient elements such as biogas slurry, industrial organic waste water, etc. directly as a fertilizer for the development of liquefaction has the significant advantage that it can be used with water for irrigation, which facilitates application and reduces costs.
Slowing down the development of slow-release fertilizers is mainly through controlling the dissolution and release rate of fertilizers, and then harmonizing with the absorption process of crops, thereby increasing the utilization rate of chemical fertilizers and reducing the amount of fertilizers. Currently, it is very popular in developed countries.
To develop compound fertilizers and compound fertilizers, chemical fertilizer products cannot stay on single element species, but should be developed towards compounding and compounding. While developing ternary compound fertilizers, compound fertilizers and BB fertilizers are used according to different soils and crops. Add trace elements in the development of multi-element compound fertilizer, BB fertilizer.
In addition to providing essential nutrients for plants, functional fertilizers have other functions, such as insecticidal and bactericidal functions, weed control functions, and plant growth regulation functions.
To the development of eco-environmental protection In China's developed agricultural areas due to unreasonable use of chemical fertilizers, the imbalance of soil nutrients has become widespread, especially for phosphate fertilizers. The utilization rate is only about 20%, most of them are fixed by soil, and bio-fertilizers are used to decompose the soil. The nutrients that are fixed in the plant not only reduce the amount of fertilizer, but also protect the ecological environment.
In our life often see different types of steel Nails, steel nails are many kinds. They have different shapes and can be selected according to different purposes and requirements. The main varieties are round nails, flat nails, square nails, triangular nails, riding nails, twill nails, nails, cement nails, split nails, nails, roofing nails, corrugated nails and so on. Common Steel pins are shown in fig. . Product name has general according to shape, use or nail fixing method (such as nail) , but also according to the surface coating to distinguish (such as galvanized nails, polished nails, etc.) . The most widely used and most widely used is the general purpose ordinary round nail.
Ordinary round nails, also known as nails, to hot-rolled low-carbon wire Rod cold-drawn into the steel as raw materials, processed by the nail machine. The strength is generally 500 ~ 1300 MPA. The dimensions of round nails are expressed in terms of length and stem diameter. Standard and heavy. The length series is 10 ~ 200nlm, the diameter series is 0.9 ~ 6.5 mm. Suitable for nail head buried in wood, used for floor nails, furniture nails, wooden nails and so on. Nail with flat head, commonly used in construction and packing box nail, the head plane is large, nail into the wood easy to pull out. Corrugated Nail, the surface by galvanized and passivation, bright color, no rust, nail cap and riveted from the nail body, mainly used for fixing the tail tile. Riding Nail for fixing wire Mesh, barbed wire, frame, etc. . Triangular Nail, is a special-shaped Nail, nail Rod â–³ shape, commonly known as Fishtail Nail, mainly for the SOFA, farm tools and other structures of the fixed. A Square peg used to fasten something, such as a wooden boat or bridge, that is not easily moved by force. Cement Nail, used for nail into the cement components, cement brick wall, made of high quality carbon structural steel, with high strength and hardness, series length of 19 ~ 102 mm, diameter of 2.5 ~ 5.5 mm. Nail-shooting is a new type of steel nail, which is one of them. Shoot nail to have general shoot nail, thread shoot nail, take hole shoot nail, special shoot nail, high speed shoot nail and so on. Nail-shooting fastening technology is to use nail-shooting gun, nail-shooting bullet and nail-shooting, will be fixed in different materials of the Matrix (generally concrete or steel) on the fastening. There are many parts suitable for nail-shooting fastening technology, and nail-shooting fastening technology is used for important parts, usually through calculation to ensure safety and reliability. The utility model relates to a head screw with screw thread, which is actually a special purpose screw fixed by ejection technique. The end part can be fixed with a washer and screwed with a nut. Because of its convenience, safety and reliability, shooting nail is a common steel nail in modern architecture. It has developed rapidly with more than ten series and nearly one hundred varieties. Commonly used nails are divided into two kinds: 1, used to determine soft materials, such as wood, materials are low carbon steel annealed state, low hardness; 2, used to determine hard materials, such as cement wall, known as cement nails, material is generally 45 # steel or 60 # steel, after the use of quenching, high hardness. What`s the difference between a steel nail and an iron nail? A steel nail is called a cement nail. It can be driven into a hard wall. There`s a thing called a nail gun, and you have to use a special tool, a nail gun, to hit a concrete wall. Nail material is softer only commonly used for carpentry, is nailed to the wood and other softer objects. One is made of steel, one is made of iron, two production components are not the same, in the hardness will not be the same steel nails harder, nail wall generally with steel nails. Must be easy to rust, easy to bend, nail wood used more.
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