Agave planted in rock piles in the prehistoric style and instrumented with digital soil temperature recordings.
Arizona State University is exploring agave rock piles and how/why they were used by prehistoric people around the Southwest to grow agaves. blog
To figure this out, we have been collecting soil temperature readings every hour in our own experimental rock piles to see if regulating soil temperature might play a role in why these rock piles were used.
Temperature readings are recorded hourly at the approximate root level of the Agave plants using Thermochron iButton data loggers.