The study looked at how different types of fertilizers affect the amount and types of carbon in yellow paddy soil. They found that using a combination of manure and chemical fertilizer increased the total organic carbon in the soil the most. The passive carbon fractions in the soil also increased with this combination, showing that it is the best option for improving soil health. The study suggests that using manure and chemical fertilizer together can help increase the amount of carbon in paddy soil, which is important for soil fertility.