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Regional Evaluation of Critical Nitrogen Concentrations in Winter Wheat Production of the North China Plain

^a Dep. of Plant Nutrition, College of Resources and Environ. Sci., China Agricultural Univ., Beijing 100094, China
^b School of Veterinary Medicine, Univ. of Pennsylvania, Kennett Square, PA 19348
^c College of Resources and Environ. Sci., Qingdao Agricultural Univ., Qingdao 266109, China
^d College of Resources and Environ. Sci., Henan Agricultural Univ., Zhengzhou 450000, China
^e Inst. of Soil Sci. and Fertilizer, Shanxi Academy of Agric. Sci., Taiyuan 030031, China
^f College of Resources and Environ. Sci., Shandong Agricultural Univ., Taian 271018, China
^g Institute of Soil Sci. and Fertilizer, Henan Academy of Agricultural Sci., Zhengzhou, 450000, China

View larger version (24K): [in this window] [in a new window]   Fig. 1. (a) Relative grain yield, (b) grain N concentration, (c) straw N concentration, (d) residual soil nitrate N at harvest, and (e) apparent N loss as functions of fertilizer N rate. Data were pooled from nine field experiments (n = 54).