Vineyard fertilization principle method
Bright steel bar is carbon or alloy steel bar with shining bright surface which is improved by cold drawing, peeling, turning, grinding and polishing over hot rolled black surface bars. By cold drawing, the steel bar yield strength and tensile strength will be improved. By peeling and turning, the surface imperfections will be removed. By grinding, the diameter tolerance will be more precision. By polishing, the surface will be much more shining.
Except the shining bright surface, comparing with the hot rolled black surface bars, the bright steel bars has better surface roughness, better roundness, straightness, more precision size tolerance etc.
Heat treatment such as annealing, normalizing, quenching and tempering will be done before do cold finishing on the hot rolled bar to get bright steel bar, in such condition, the steel Bright Bar will get most suitable mechanical properties to meet different application requirement.
The advantages of steel bright bars we supply:
1) Big stocks of hot rolled round bars or wire rods as raw materials
2) Heat treating furnaces to adjust the mechanical properties
3) Full sets of testing equipment to test the sizes, mechanical properties and microstructure.
4) Multiple packages to avoid broken packages and anti-rusty
Diameter tolerance
+0/-0.02mm
Straightness
0.5mm/m
Surface roughness
0.4um
Roundness
80% of diameter tolerance
Diameter range
14mm to 100mm
Steel grade
Kinds of carbon steel and alloy steel
Length
Any length can be cut with precision tolerance
Bright Steel Bar Bright Flat Bar,Bright Steel Bar,C45 Steel Round Bar,Bright Steel Round Bar SHANDONG LE REN SPECIAL STEEL CO., LTD. , https://www.lerenspecialsteel.com
Mainly organic fertilizer, supplemented by inorganic fertilizer. Formulated according to the grape variety, development stage and soil fertility; can improve soil structure, increase soil microbial activity, increase soil organic matter content, improve soil fertility; avoid harmful substances entering the soil, control pollution, and protect the environment.
Second, the fertilization method:
The base fertilizer is suitable for autumn application, and the topdressing is carried out according to the key growth period of the grape. It is not advisable to apply chemical fertilizers within 1 month before harvest. For limited use of chemical fertilizers, such as urea, potassium dihydrogen phosphate, superphosphate, etc., should be mixed with organic fertilizer or microbial fertilizer. The ratio of organic nitrogen to inorganic nitrogen is 1:1, which is equivalent to the ratio of 1000 kg of farmyard manure plus 20 kg of urea.
