The researchers conducted a field experiment at Xingkaihu farm to determine the best fertilizer quantities for rice production. By testing different amounts of nitrogen, phosphorus, and potassium, they found that the optimal levels were N 59.984 kg/hm2, P2O5 59.984 kg/hm2, and K2O 51.72 kg/hm2. With these amounts, the highest rice yield achieved was 8,360.85 kg/hm2.