Testing Forages for Nitrates

Time limit: 30 days


Full course description

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Intended Audience

This course is intended for OSU Extension staff.

Time Requirements

  • One hour total
  • The course is divided into 3 modules which can be completed at your own pace.
  • Each module should take approximately 20 minutes to complete.

Learning Objectives

After completing this course, you will be able to

  • safely and accurately perform the diphenylamine test.
  • determine if a sample requires lab testing.
  • apply effective practices for using lab services and results.

Teaching Method

This is an asynchronous, self-paced, course.  You will watch videos, engage in learning activities and take quizzes.  


  • Prepare for Testing
  • Conduct the Test
  • Manage Lab Tests

Completing the Course

  • To pass the course, you must score 90% on each of the three module assessments.
  • Once you have completed the course, you can print a certificate of completion. 



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