1. Base fertilizer: On the basis of applying enough organic fertilizer, apply 15 to 20 kg of phosphorus nitrate and potassium fertilizer per mu.
2. Topdressing: topdress the fertilizer after squatting, topdressing 20 kg of nitrate phosphate fertilizer per mu, and topdressing 20 kg of nitrate phosphate fertilizer every 20 days thereafter, stop top dressing 20 days before harvest.
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28k Ultrasonic Spot Welding Machine, mainly suitable for automotive sound insulation cotton, mask ear straps, plastic parts and other products that need spot welding, its principle is that the generator generates pressure, and the transducer produces the same frequency of alternating current, converted from piezoelectric ceramics into mechanical vibration, and mechanical vibration produces thermal friction. Friction melts the contact point between the two parts, allowing the part to bond quickly.
The 28k spot welder has a wide range of applications:
Spot welding of thermoplastic thin materials: synthetic chemical fabrics, flat fabrics, knitted fabrics, nylon fabrics, non-woven fabrics, onion cloth, artificial leather, PU, sardines, PS, PVC, TR and various film covering or bonding fabrics.
Spot welding, pressure welding, riveting, marking, sealing, clothing, shoes, handicrafts etc., but also suitable for riveting and welding of auto parts such as bumpers, instrument panels, door panels, etc.
28K Ultrasonic Spot Welding Machine advantages: small size, easy to carry, easy to operate, spot welding machine beautiful appearance.
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