巴基斯坦采购需求：硫酸铵晶体、硫酸铵颗粒、氯化铵、硫代硫酸铵、硝酸钙、硝酸钙颗粒

I'm interested in sourcing a couple of products for testing purposes. Specifically, I'm looking for a type of NPK fertilizer that's well-known for its effectiveness, suitable for a variety of crops. Additionally, I would like to request a sample of a calcium nitrate product in a 1kg package, as I want to assess its quality and performance. Could you please provide me with pricing details, availability, and any relevant specifications for both items? Your prompt response would be greatly appreciated, as I am keen to move forward with this procurement. Thank you!