Vegetable fields often use more fertilizers
Fertilizer-contaminated vegetables Long-term application of chemical fertilizers, especially the “nitrogen-based vegetables†produced by excessive nitrogen fertilizer, the edible parts of stems and leaves are heavily polluted by nitrates, which will multiply the nitrate content in vegetables, nitrate It is easily reduced to nitrite in the human body. Nitrite is a highly toxic substance that causes hypoxia in human cells. Long-term consumption of this kind of vegetables can cause children's mental decline and can induce cancer, which is extremely harmful. Therefore, in some developed countries, it is now clearly stipulated that nitrogen fertilizer vegetables are prohibited from being listed, so as to ensure the interests of consumers.
It is difficult to preserve fresh vegetables produced by chemical fertilizers. It seems that the stems are tender and leafy. Unconsciously, they think that the quality is superior. In fact, the nitrate content of this vegetable exceeds the standard, and it is easy to mold and deteriorate during stacking and storage, so that the content of toxic substances is high. increase. It has been determined that in the winter and spring storage process, the cabbage rot caused by the application of nitrogen fertilizer is more than 20% higher than the rot of the farmer's manure, and the nitrate content is also multiplied.
Soil structure is destroyed. Long-term application of ammonium sulfate, potassium sulfate and nitrogen-containing fertilizers in vegetable soils will destroy the soil structure, cause soil compaction, lose flexibility and elasticity, and reduce water permeability. Long-term application of chemical fertilizers, calcium ions on the soil colloids are continuously exchanged. Under the leaching of rainwater and irrigation water, ammonium sulfate and calcium chloride are washed into the lower layer of the soil, causing calcium deficiency in the tillage layer, destroying the soil structure and making the soil It becomes knotted, fertility declines, vegetables grow poorly, and production is reduced. Because of the good soil structure, in addition to a large amount of organic matter, it is generally rich in calcium. The structure of calcium-deficient soil is good, it is not fixed, and it is easily damaged. Only soil with certain calcium content is stable. The granule structure is the most ideal soil and can produce high-yield and high-quality vegetables.
The acidification of the soil is harmful to the acid fertilizers such as ammonium sulfate, ammonium chloride, potassium chloride and superphosphate. After a large number of application of vegetable fields in successive years, a large amount of acid substances will remain in the soil, making the neutral soil acidic, acidic soil. More acidification, which destroys the soil microflora and is not conducive to the normal growth of most vegetables. Long-term application of chemical fertilizers, especially the application of ammonium sulfate, potassium sulfate, potassium chloride, etc., for many years, can only increase the content of sulfate ions and chloride ions in the soil, and these two ions are harmful ions to the soil. Not only is it harmful to the growth of vegetables, but also causes secondary salinization of the soil, destroying the structure of the soil and affecting the absorption of other nutrients by vegetables. Long-term overdose of chemical fertilizers in vegetable fields not only causes harm to vegetables, but also hinders the absorption of other nutrients by vegetables and causes deficiency. For example, excessive application of nitrogen-containing fertilizer can cause calcium deficiency in vegetables; excessive nitrate nitrogen can cause deficiency of molybdenum; excessive potassium will reduce the effectiveness of calcium, magnesium and boron; excessive phosphorus will reduce calcium, zinc and boron. Effectiveness, etc.
Therefore, vegetable land should be applied to the maximum extent of organic fertilizer or other non-chemical nitrogen fertilizer, instead of chemical nitrogen fertilizer, without affecting the normal growth and development of vegetables, try to use organic fertilizers such as ring fertilizer, chicken manure and various cake fertilizers, such as cottonseed cake, Non-chemical fertilizers such as rapeseed cake, bean cake, and biological bacterial fertilizer replace chemical nitrogen fertilizer to prevent vegetable pollution, reduce chemical fertilizer residues and cause pollution and damage to the soil. (Li Cuiying, Rural Office of Lujiang City, Hunan Province)
Farmers Daily
General Purpose Powder-Actuated System is used for building fastening, which have three parts: Actuated tools, Cartridges and fasteners. When Actuated Tool strikes cartridge and cartridge will explode in the inner of tools and produce a lot of high temperature and high pressure gas. The gas will push the piston and the piston will push the fasteners into the basement. Or the gas will push the fasteners directly into the basement. Like this, we can fix a lot of things into concrete and steel basement tightly.
The fundamental is as the following:
The Actuated tools are classified for direct tools and undirect tools, we can also called high velocity and Low velocity tool, the fundamental is as the following:
High velocity tool:
Low velocity tool:
Based on different purpose, Cartridges are classified for different calibers and dimensions. The usual caliber and dimension is as the following:
.27calX11mm(S1)
.22calx15mm(S5)
.22calx16mm(S52)
.27calx18mm(S3)
.25calX16mm(S43)
At the same time, each caliber cartridge is classified for different specification based on the quantity of inner powder, which is marked by different color. when the color is more darker, the power level is stronger. otherwise, the power lever is lighter.
The fasteners are classified for different categories. Each different category is classified for different specification based on different length and diameter. At the same time, it is can also be re-designed based on special use.
The packages are as the following:
1. Tools: one tool/ plastic box/carton or five boxes/carton
2.Cartridge: 100pcs/paper or plastic box, 100boxes/carton.
3. Fasteners: 100pcs/paper box, XX boxes/carton.
For shipment, all cartons will packed by pallet.
General Purpose Powder-Actuated Systems
General Purpose Powder-Actuated Systems,Powder-Actuated Systems,Powder Actuated Fasteners,Powder Actuated Fastening System
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