The 1935 Agricultural Schedules (none population) for Puerto Rico, are now available on Ancestry. Com.
This census is also referred to as the Farm Schedules for 1935.

http://search.ancestry.com/search/db.aspx?dbid=3033&enc=...

Puerto Rico, Special Censuses, Agricultural Schedules, 1935 - Ancestry.com

Good luck
Ariel Blondet