Check out “Sustainable Agriculture Resources and Programs for K-12 Youth” by Sustainable Agriculture Research and Education (SARE).
This 16-page (PDF) guide to sustainable agriculture-oriented educational opportunities for schoolchildren features more than 50 programs and curricula nationwide, from “Growing Minds,” a program linking the garden and agriculture in Appalachia, to “French Fries and the Food System,” a year-round curriculum focusing on ways youth can better understand land and local food systems. Includes direct links, program contact information and ideas for integrating lessons into school programs.
The document can be downloaded as a PDF file (Adobe Reader required) at http://www.sare.org/publications/edguide/k12ed_guide.pdf
You can find out more about SARE at http://www.sare.org/.