Application of Chemical Fertilizer Combined with Manure Improves Maize Yield, Nitrogen Absorption and Grain Zinc Content

【Objective】 To regulated the growth and nutritional status of maize during the application period of N, P and K under the condition of chemical fertilizer combined with organic fertilizer in the hope of providing technical support for reducing application and increasing efficiency of maize. 【Methods】 Five treatments were set up and repeated for 3 times, CK: no fertilization; PK: apply phosphorus and potassium fertilizer without nitrogen fertilizer; NPK: apply nitrogen, phosphorus and potassium fertilizer; NPKZn: apply nitrogen, phosphorus, potassium and zinc fertilizer; NPKM: apply nitrogen, phosphorus, potassium fertilizer and organic fertilizer. 【Result】 The two-year experiment showed that compared with farmers' customary fertilization, chemical fertilizer combined with organic fertilizer increased corn yield by 6.5%, N absorption by 4.5% and grain Zn concentration by 3.3 mg/kg. 【Conclusion】 The combination of chemical fertilizer and organic fertilizer can significantly increase maize yield, N absorption and Zn concentration in grain, which is an effective measure to reduce the application of chemical fertilizer.