I need to travel to Spain and conduct various ecological analyses, including soil chemical analysis. I won't have access to a lab, so I'll need to carry out a simple soil NPK and pH analysis.

Taking soil samples home would cost me £750, which is just not going to happen.

I'm finding it really hard to find any information about how to legitimately transport a soil NPK kit through Spanish customs, so I want to turn to scientists who may have already done so.

Is it expensive/possible? Do I need forms?

Thanks in advance