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Welcome to the web home for Field, Lab, Earth, the podcast from the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America. The podcast all about past and present advances in agronomic, crop, soil, and environmental sciences, our show features timely interviews with our authors about research in these fields.

Field, Lab, Earth releases on the third Friday of each month in addition to the occasional bonus episode. If you enjoy our show, please be sure to tell your friends and rate and review. If you have a topic, author, or paper you would like featured or have other feedback, please contact us on Twitter @fieldlabearth or use the email icon below. You can join our newsletter to receive notifications about new episodes and related resources here.

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  2. The Nitrogen Value of Cover Crops with Dr. Guillermo Marcillo

The Nitrogen Value of Cover Crops with Dr. Guillermo Marcillo

Sep 19, 2025

“The Nitrogen Value of Cover Crops” with Dr. Guillermo Marcillo.

Cover crops are known for their ability to provide economic and ecosystem services to farmers, including, for example, impacting soil nitrogen. But how much nitrogen, exactly, can cover crops add or remove and how do we find out? In this episode, Guillermo joins me to discuss his work collating research data to get to the bottom of cover crop nitrogen replacement values.

Tune in to learn:

·         What a nitrogen replacement value is

·         Why negative nitrogen replacement values are sometimes a positive

·         Which cover crops have, generally, which nitrogen replacement values

·         How nitrogen replacement values can be reverse engineered from existing data

If you would like more information about this topic, this episode’s paper is available here: https://doi.org/10.1002/ael2.70006

This paper is always freely available.

Contact us at podcast@sciencesocieties.org or on Twitter @FieldLabEarth if you have comments, questions, or suggestions for show topics, and if you want more content like this don’t forget to subscribe. If you’d like to see old episodes or sign up for our newsletter, you can do so here: https://fieldlabearth.libsyn.com/.

If you would like to reach out to Guillermo, you can find him here:
gmarcillo@wtamu.edu

Resources

CEU Quiz: https://web.sciencesocieties.org/Learning-Center/Courses/Course-Detail?productid=%7b9A6669B5-C497-F011-B4CC-000D3A599510%7d 

Transcripts: https://www.rev.com/app/transcript/NjhjYWFkNTBhZDQ3ZGFjZGUyZjMxYmQ4ajBOeXVVX3ZKb2t5/o/VEMxMDIwODkyMDA5

Water working group at West Texas A&M University: https://www.wtamu.edu/academics/college-engineering/water-working-group/people.html

Practical Farmers of Iowa: https://practicalfarmers.org/

Precision Sustainable Agriculture: https://www.precisionsustainableag.org/

Field, Lab, Earth is Copyrighted by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.