Pre-plant nitrate (both 0-12″ and 12-24″ samples): $15
Pre-sidedress nitrate (one 0-12″ sample): $10
Forms & Instructions
Please see Chapter 6 of A2809 for detailed sampling instructions.
Corn PPNT: Ehrhardt, P.D., and L.G. Bundy. 1995. Predicting nitrate-nitrogen in the two- to three-foot soil depth from nitrate measurements on shallower samples. J. Prod. Agric. 8:429-432.
Winter wheat PPNT: Bundy, L.G., and T.W. Andraski. 2004. Diagnostic tests for site-specific nitrogen recommendations for winter wheat. Agron. J. 96:608-614.