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