Corn Yield Response to Phosphorus Fertilization in Northeastern China
2015
Zhang, Yubin | Peng, Mengsu | Wang, Jianfeng | Gao, Qiang | Cao, Ning | Yang, Zhenming
Limited information on the relationship between corn (Zea mays L.) yield and P fertilization rate has hampered rational P-management strategies, which are necessary to help agronomists match P inputs with crop requirements. This study has evaluated corn yield response to P fertilization rates via 419 on-farm experiments in northeastern China. The increased yield due to phosphorus fertilization (IYₚ, the highest yield among all P fertilization treatments minus the yield of the zero phosphorus control [P₀] treatment) averaged 1.3 Mg ha–¹ and varied from –1.38 to 4.98 Mg ha–¹. This variation can be explained by variable farming practices, hybrid corn varieties, and environmental factors (e.g., water availability). Under the current P-management system, the maximum corn yield increased and IYₚ decreased with increasing P₀ yield, suggesting that further increasing the IYₚ of the P₀ treatment via the strategic management of hybrids, soil, and P input is essential for achieving high yields and high phosphorus-use efficiency (PUE).
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