In the production of green agricultural products, in addition to the selection of excellent varieties, the use of biological pesticides without chemical pesticides, there are many lectures on planting soil conditions and fertilization methods.
The soil is free of pollution. As a farm producing green agricultural products, it is necessary to stay away from factories with pollution, waste gas and waste residue. Select the production base to collect soil samples in advance, send them to the relevant units for testing, check the residual amount of pesticides in the soil and the content of heavy metals. If it exceeds the standard, it is not suitable for the production base of green agricultural products.
Add organic fertilizer. The output of green agricultural products is mainly obtained by adding organic fertilizer, so it is necessary to build up organic fertilizer. The first is the accumulation of livestock and poultry manure. More livestock and poultry can increase the income of farming and build high quality organic fertilizer. The second is to use weeds, straw, river pond mud, animal manure and urine, and engage in high temperature composting and grassland manure. Third, the stalk should be improved, and measures to reduce nitrogen, stabilize phosphorus, and increase potassium are beneficial to the balanced absorption of nutrients.
Add trace element fertilizers. The application of micro-fertilizer can greatly increase the yield of crops, and at the same time effectively improve the quality of agricultural products and increase the content of trace elements in agricultural products. However, it should be noted that micro-fertilizers should not be applied more, and excessive amounts can contaminate the soil and pollute crops.
Irrigation of non-polluting water. Water has a great impact on the quality of agricultural products. Inadvertent irrigation will contaminate agricultural products and will also contaminate fish and crabs in farmland.
According to the attributes of nuts, there are national standard (GB) , German standard (Din) , international standard (ISO) , Japanese Standard (Jis) , American Standard (Astm/ansi) and other standards. Among them, GB, DGB and JGB are denoted by M (for example, M8, M16) , while the American and British systems are denoted by fractions or # (for example, 8 # , 10 # , 1/4,3/8) . Sentence is too long, please supply a shorter sentence
Nut Material: Carbon Steel, stainless steel, copper, alloy, etc
Stainless steel hexagon nuts (GB6170/DIN934) , thin nuts (GB6172/DIN439) , heavy nuts (metric and us) , nylon lock nuts (Din 985-din 982 thick) , all-metal lock nuts (din 980m) , cap nuts (din 1587) , flange nut (GB6177/DIN6923) , flange nut nylon lock nut (DIN6926) , four-corner welding nut (DIN928) , hexagon welding nut (Din929) , butterfly cap (GB62, Din315, US) , k cap and so on. Specification: M1.6-M64
Nut Specification nut specification table is specific and detailed to unify all kinds of nuts, with the table to some of the nuts out of the specifications. There are many types of nuts, there are different materials of nuts. Each kind of nut has the different specification, each kind of screw also has it to have the mechanical performance and the function.
Dome Nuts,Ss Nut Bolt,Metal Nut,Stainless Steel Bolts And Nuts
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