Challenge Faves

Join the Goodreads Author Program

Are you Professor Claudia Wagner-Riddle, author of the book below?
Improving nitrogen use efficiency in crop production by Professor Claudia Wagner-Ri...


To join the author program as Professor Claudia Wagner-Riddle, you will first need to sign in to Goodreads. Then navigate back to this page to apply.


About the Author Program
Authors on Goodreads
Author Guidelines
Author Program How-To
Author & Advertisers Blog
Ask the Author: Featured Authors
About Goodreads