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Stalk Nitrate Testing


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Stalk Nitrate Testing is available at Midwest Laboratories. Check out more information in this particular document

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Stalk Nitrate Testing

  1. 1. Stalk Nitrate Test 13611 B Street Omaha, NE 68144 (402) 334-7770 Fax: (402) 334-9121 6 inches off the ground Sample 8 inches of the stalk Sampling When to Sample: Best time to sample is between 1 and 3 weeks after black layers have formed on 80% of the kernels. What part to sample: Sample the 8-inch segment, 6 inches off the ground. Remove leaf sheaths from the segment. How much sample: Collect fifteen 8-inch segments at random* within an area not larger than 10 acres to form a single sample to send for analysis. Place samples in paper (not plastic) bags to enable some drying and to minimize growth of mold. *Do not sample stalks that have been damaged by disease or insects. Questions? Craig Ebel(402) 590-2962 John Torpy (402) 829-9880 The end-of-season cornstalk test is a good tool for evaluating nitrogen (N) management practices used in any corn field in any year. The test is most valuable when used on field that show no visual signs of N deficiency. Its use is strongly recommended for manured corn fields.
  2. 2. Name Address City State Zip Code Account Number Telephone Fax email Account Number Grower Identification Stalk Nitrate Test Submittal Form Stalk nitrate-N concentrations can be divided into three categories: low, optimal, and excess. Low: less than 700 ppm N This indicated high probability that greater availability of N would have resulted in higher yield. Concentrations in this range, however, give little indication of the magnitude of yield increase that might be expected from more available N. Optimal:700 to 2000 ppm N This indicated high probability that N availability was within the range needed to maximize profits for the producer. Excess: greater than 2000 ppm N This indicates high probability that N availability was greater than when fertilizer N was applied at rates that maximize profits for producers. Sample ID Stalk Nitrate Test Comments/Other analysis Results $15 per sample Remarks