The researchers wanted to see how the ratio of carbon to nitrogen (C/N) affects composting pig manure with sawdust. They made two piles with different C/N ratios: one with more pig manure and one with less. The pile with more pig manure took longer to heat up, had lower temperatures, and didn't reach maturity as quickly. It also had higher pH and nutrient levels, making it less suitable for plants. The pile with less pig manure reached maturity after 49 days, while the other pile was still immature after 63 days. This shows that a lower C/N ratio in composting pig manure with sawdust can take longer and may not be as good for plant growth due to high nutrient levels.