A study looked at how different amounts of nitrogen, phosphorous, and potassium fertilizers affect maize yield in different types of soil. They found that nitrogen increased yield by 15.6% to 62.2%, phosphorous by 11.2% to 26.7%, and potassium by 2.3% to 34.3%. The best fertilizer amounts for higher fertility soil were 129.8-167.8 kg/hm2 of nitrogen, 50.6-71.8 kg/hm2 of phosphorous, and 29.4-60 kg/hm2 of potassium. For medium fertility soil, it was 163.6-186.2 kg/hm2 of nitrogen, 74.2-94.9 kg/hm2 of phosphorous, and 59-97.7 kg/hm2 of potassium. For lower fertility soil, it was 182.8-203.4 kg/hm2 of nitrogen, 94.3-118 kg/hm2 of phosphorous, and 92-106.9 kg/hm2 of potassium. And for very low fertility soil, it was 200-225.4 kg/hm2 of nitrogen, 105.9-135.5 kg/hm2 of phosphorous, and 107.1-137.5 kg/hm2 of potassium.