Ryan and Deci’s website contains informative articles on practical classroom application of self-determination theory. To find the articles, scroll to middle of page and click the "education" link. The following articles are especially helpful:
Niemiec, C. & Ryan, R. (2009). Autonomy, competence, and relatedness in the classroom; Applying self-determination theory to educational practice. Theory and Research in Education, 7(2), 133-144. This is the first article under the subheading Chapters, overviews, and commentaries from the Rochester SDT labs.
Reeve, J., & Halusic, M. (2009). How K-12 teachers can put self-determination theory principles into practice. Theory and Research in Education, 7, 145-154. Ten items that teachers can use to assess student perceptions of their support or control are provided in Table 1, p 151 of this article that can be found towards bottom of the page under subheading Chapters, overviews and commentaries from other labs.