The study looked at how using fertilizers and farmyard manure for 36 years affected crop growth and soil health. They found that applying the right amount of fertilizers and manure greatly increased maize and wheat yields. The soil became less acidic but lost some nitrogen. Using fertilizers and manure together improved the soil's organic carbon and nutrient levels. The roots of the plants were healthiest when both fertilizers and manure were used. Overall, using a balanced mix of fertilizers and amendments is important for keeping the soil fertile and crops productive over time.