Plant tissue analysis is a valuable aid in crop management. Alone, it can be used for making fertilizer recommendations for certain crops, such as tree fruits and grapes. For other crops, plant tissue analysis in combination with soil test information is the recommended approach for diagnosing nutrient deficiencies and determining fertilizer requirements.
The Late Season Cornstalk Nitrate Test has been demonstrated to be a reliable end-of-season indicator of crop N status based on research performed throughout PA as well as other states.
Any suspect feed should be tested for nitrate levels before feeding. The silage can also be tested at harvest to determine if nitrates are a cause for concern. Because nitrate levels decline during ensiling, regular forage tests for formulating rations, taken as the silage is fed, should also include a nitrate analysis.
List of the standard plant testing methods used by the Agricultural Analytical Services Lab.