{HEAD ~ The exchange ratio}, which is the ion exchange capacity of {TAIL ~ the soil} divided by the ion exchange capacity of the extractor should be greater than 10 in order to minimize exchange ion effects 
{ HEAD ~ The exchange ratio } , which is the ion exchange capacity of { TAIL ~ the soil } divided by the ion exchange capacity of the extractor should be greater than 10 in order to minimize exchange ion effects
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH