The researchers conducted a field experiment to see how different fertilizer practices affect rice and wheat yields and soil properties. They found that substituting some chemical fertilizers with organic materials like farmyard manure and straw improved soil quality and crop yield. The highest rice yield was achieved when 25% of the recommended fertilizer was replaced with farmyard manure. For wheat, the best yield came from substituting 25% of the fertilizer with farmyard manure. The study also showed that rice yield was negatively related to soil pH and electrical conductivity, but positively related to phosphorus, sulphur, and calcium levels. Wheat yield was negatively related to soil pH, but positively related to phosphorus, sulphur, and calcium levels.