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...Highway west p o box northwood nd phone fax agvise polarcomm com www street north benson mn bensonlab soil sampling guide only nutrients that are mobile in such as nitrogen introduction sulfur and chloride tested on both the testing is best tool available to determine inch sample depths deep rooted crops like sugarbeet amount of each nutrient needed for coming crop year corn often require be down inches test results have most value when area sampled uniform enough represented by one any field which non representative should avoided or separately differences type k ph organic matter salinity ca topography history manure other mg zn fe cu can done at time management all reasons divide a these properties every two into more separate samples four years sufficient because do not fluctuate greatly from many ag equipment retailers consultants usually collected with probe develop better long term trends this allows collection slice property profile depth laboratories generally manufactures dis...