Concentrated solution to crop topdressing problems

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Mr. Guan from Songyuan City, Jilin Province: Is it possible to use compound fertilizer for a single application? Answer: Yes, in two specific situations. First, if the field is suffering from drought and water is scarce, you can apply high-nitrogen and high-potassium compound fertilizer. It's best to choose a slow-release nitrogen fertilizer to ensure longer nutrient availability. Second, if mechanized fertilization is available, you can apply the compound fertilizer at different soil depths before planting. In this case, a high-nitrogen type compound fertilizer is recommended. Mr. Lu from Haicheng, Liaoning Province asked: How should a corn-specific compound fertilizer with a ratio of 22:8:15 (N:P₂O₅:K₂O) be applied? Answer: This special fertilizer has a balanced nutrient distribution and is suitable for one-time application. However, if used as a base fertilizer and then additional nitrogen is added later, the total nitrogen content might become too high. Therefore, under mechanized conditions, it's recommended to apply 40–60 kg per acre before or during sowing. Distribute 1/5 of the fertilizer in the top 10 cm of soil and 4/5 in the 15–20 cm layer. If not using mechanized equipment, apply 20–30 kg of the special fertilizer as base fertilizer, along with 5–10 kg of diammonium phosphate. Then, apply 15–20 kg of urea during the tasseling stage for better growth. Ms. Su from Shangqiu City, Henan Province asked: After applying urea in the greenhouse and watering it, the leaves turned yellow after 4–5 days. What could be the reason? Answer: There are two possible causes. One is that water was applied immediately after fertilization, causing the urea to leach down into deeper soil layers, leading to temporary nutrient deficiency. Urea needs about 3–5 days for microbial conversion into ammonium nitrogen before it can be absorbed by the plants. The second possibility is excessive irrigation, which washes the fertilizer beyond the root zone. To avoid this, try to avoid large amounts of water and fertilizer at the same time. Mr. Sheng from Xiaogan City, Hubei Province asked: In local farming practices, people tend to apply potassium sulfate or sulfur-based compound fertilizer regardless of the crop. Is this a good practice? Answer: Potassium chloride is the main source of potash and is suitable for most crops, especially in areas with rain or irrigation. Potassium sulfate is more suitable for chlorine-sensitive crops like tobacco, soybeans, onions, rape, and berries. Using potassium sulfate unnecessarily increases costs and may lead to soil acidification due to sulfate accumulation. In some cases, it can combine with calcium to form gypsum, leading to soil compaction. So, it's important to choose the right fertilizer based on the crop and soil conditions. (Senior Consultant of Sinofert, Professor Wang Xingren from China Agricultural University) Farmers Daily
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Frog Bolt

Other Track Bolt styles


Materials: Steel Q235, 35#, 45#; Alloy Steel 40Cr, 42CrMo, 35CrMo

Grade: 4.6/4.8/5.6/5.8/8.8/10.9/12.9, AREMA Gr5/Gr8

Standard: AREMA, UIC, DIN, BS, GOST, NF, JIS, GB/TB, AS or required specification from clients

Type: Fish Bolt/ Frog Bolt/ Clip Bolt/ Clamp bolt

Surface: Plain Oiled, Oxygen Black, Zinc Plated, Hot Dip Galvanized, Dacro coating


Most popular bolt:

Fish bolts with button head and square head are most popular, with specifications as below:

Type
Button head oval neck fish bolt

Button head diamond neck fish bolt

Square head fish bolt

Grade
4.6
5.6
8.8
10.9

Material
Q235
35#
45#
40Cr

Mechanical properties
Tensile strength:≥400Mpa
Tensile strength:≥500Mpa
Tensile strength:≥800Mpa
Tensile strength:≥1000Mpa

Yield strength:≥240Mpa
Yield strength:≥300Mpa
Yield strength:≥640Mpa
Yield strength:≥900Mpa

Elongation:≥22%
Elongation:≥20%
Elongation:≥12%
Elongation:≥9%

Cold bending:90 degree without crack
Cold bending:90 degree without crack
Cold bending:90 degree without crack
Cold bending:90 degree without crack

Surface
Plain (oiled), Oxide black, Zinc, HDG, wax, bitumen, Dacromet, Sherardizing

Standard refers
AS, BS 64, DIN, AREMA/SAE,NF,JIS


Accessories

* Nut:

Type: square nut/heavy square nut/hex nut/heavy hex nut/flange nut/slotted nut/lock nut/wrench nut, etc.

Material:Steel Q235, 35#, 45#; Alloy Steel 40Cr, 42CrMo, 35CrMo

Grade: 4/5/8/10/12, AREMA ,SAE J995

Surface: Plain Oiled, Oxygen Black, Zinc Plated, Hot Dip Galvanized, Dacro coating


*Spring washer

Material: 65MN/60Si2Mn

Grade: AREMA 1967/ GB

Surface: Plain Oiled, Oxygen Black, Zinc Plated, Hot Dip Galvanized, Dacro coating


Other bolt styles

*Clip bolt for tension clip



*Clamp bolt for clamp



* Frog bolt for turnout: square head bolt/thin square head drilled bolt/BHON bolt



*Tunnel bolt: Spear bolt/ curved bolt

Frog Bolt,Button Head Oval Neck Frog Bolt,Squarehead Frog Bolt,Thin Head Square Bolt

TAICANG ZHONGBO RAILWAY FASTENING CO., LTD. , https://www.railfastener.com