We have also tied in the weather and climate standards from the Next Generation Science Standards. This goes along perfectly with social studies, as changes in climate can dramatically affect the crops here.
I love this unit because it ties in social studies, science, reading, writing, and math. Whew! I put together a googledoc of the whole unit plan, which you can access here: https://docs.google.com/document/d/17YlQDZAOxRFa-2JrxUfqrTIOLzmg4-nMOtWnIJjMVZw/pub
I also loved this lesson because there were so many components incorporated in to it: the 4 language domains, math literacy, group work and collaboration, and science and social studies content. Awesome!