2014-12-042014-12-041969https://hdl.handle.net/10365/24613The NDSU Soils Department began testing soil samples for nitrate nitrogen in 1968. The method used to extract and to collect 40-80 samples for an 80 acre field was quite time consuming. In Response, NDSU Agricultural Engineers designed an inexpensive soil probe operated by the hydraulic dump box on a farm truck. One man operation is possible. The diagram for this device is given in this one page article.North Dakota State UniversityArticle