Abstract: System and method for monitoring of environmental conditions, such as temperature, humidity and pressure, inside a granulated material pile, particularly piles of fertilizer, at production and storage sites. Environmental condition detectors in a plurality of first housing segments are spaced apart within the pile by intermediate elongate second housing segments to form an elongate columnar housing which extends within the pile. Data can be transmitted through electrical cables or by radio frequency transmitted data. The conditions at various levels adjacent each first housing segment can be monitored and correlated with the aging of the pile until the pile reaches grade. The data may be displayed and processed to correlate and profile the data for signs of pile set.