Parameter Determination to Formula Fertilization by Soil Testing for Super High-Yield Maize: A Case Study in Yudong Plain,Henan Province

In order to provide technical parameters for formula fertilization by soil testing for super high-yield maize in alluvial soil region of Yudong plain, we conducted a field experiment with five fertilization combinations of nitrogen (N), phosphorus (P₂O₅) and potassium (K₂O). The results showed that summer maize with a production level of 12 835.5 kg·hm^-2~14 310.0 kg·hm^-2, its grain formation of 100 kg required to absorb 2.81 kg of N, 1.25 kg of P₂O₅ and 3.10 kg of K₂O, respectively. N, P₂O₅ and K₂O use efficiency were 35.0%, 25.4% and 31.4%, respectively; The grain increase per unit fertilizer (kg·kg^-1) was N 9.7, P₂O₅ 16.5, K₂O 11.9 and NPK7.7, respectively. The soil available nutrients correction coefficients were N 1.287 7, P₂O₅ 1.409 6, and K₂O 0.985 2, respectively; The soil nutrient supplying (kg·hm^-2) of no fertilizer treatment was N 225, P₂O₅ 105, and K₂O 252, respectively. Therefore, the fertilization contribution rates were 64.4% from soil nutrients and 35.6% from fertilizer nutrients, respectively.