Choose your answer before opening the explanation. This is a learning exercise, not a competency assessment.
The core of a 4-day-old heap reads 52 °C. Most likely cause?
- Too much gypsum
- Too little nitrogen, water or heap size
- Straw too fresh
- Too many turnings
See the answer and why
Too little nitrogen, water or heap size ICAR-DMR expects 65 to 70 °C by day 2 to 3.

