What are the fertilizer requirements for corn?

Corn plants contain 16 elements, all of which must be absorbed from the soil except C, among which nitrogen, phosphorus, potassium, sulfur, calcium and magnesium are required in larger amounts, and iron, manganese, zinc, copper, barium, etc. From 10 days before tasseling to 25-30 days after tasseling, corn is at the stage of fastest material accumulation and most fertilizer absorption. This stage absorbs 70-75% of nitrogen, 60-70% of phosphorus and fertilizer. 65% potassium. After calculation, the production of 100 kg of corn seeds requires 2.5 kg of nitrogen, 1 kg of phosphorus, and 2.1 kg of potassium. If the yield of 500 kg of corn per mu requires about 33 kg of urea or 50 kg of ammonium nitrate, 31 kg of superphosphate, and 13 kg of potassium sulfate.