Presumably you mean P,K,Mg ?? N is a deep core test done on it's own in the winter months. I can send you sample bags and a freepost envelope. Or if you've a lot to send I can probably pick them up for you. Need approx 300g to 500g of soil in each sample bag. Samples would be sent to Lancrop. We've trialled a few labs over the years and found this lab to be the most consistent in the trials.
