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NITROGEN MANAGEMENT

Performance of an Optimized Nutrient Management System for Double-Cropped Wheat-Maize Rotations in North-Central China

^a Ministry of Agriculture Key Lab of Crop Nutrition and Fertilization, Inst. of Agric. Resources and Regional Planning, Chinese Academy of Agric. Sci., Beijing 100081 China, and Beijing Office of the International Plant Nutrition Institute, Beijing 100081 China
^b Inst. of Soil and Fertilizer, Shanxi Acad. of Agric. Sci., Taiyuan 030031 China
^c Inst. of Soil and Fertilizer, Hebei Acad. of Agric. Sci., Shijiazhuang 050051 China
^d College of Resource and Environment, Henan Agricultural Univ., Zhengzhou 450002 China
^e Inst. of Soil and Fertilizer, Shandong Academy of Agric. Sci., Jinan 250100 China

^* Corresponding author (phe{at}ipni.net).

Overapplication of N and P and insufficient supply of K are considered primary reasons for restriction of yield improvement in the North China Plain. Optimized nutrient management practices based on soil testing and yield targets have been developed. Other large scale field experiments have indicated that additional improvement for yield and nutrient use benefits is needed. The objective of this study was to evaluate the effects of the optimized nutrient management system on yield, nutrient uptake, nutrient utilization, and profit in the North China provinces of Shanxi, Hebei, Shandong, and Henan. Treatments consisted of a check without fertilizer use (CK); a balanced, optimum nutrient application (OPT); the farmers' practice (FP); and a series of nutrient omission treatments (minus N, P, and K, respectively). The results indicated that the OPT optimized grain yield, nutrient use efficiency, and profitability. Maize (Zea mays L.) yield increased by 12.2% at Shanxi and 18.5% at Hebei, respectively. Inputs of N and P across the wheat (Triticum aestivum L.) and maize system at the four sites was reduced by 13% (266 kg N ha^–1) and 45% (430 kg P₂O₅ ha^–1), while K input was increased by 43% (265 kg K₂O ha^–1). The OPT improved both measurements of nitrogen use efficiency (NUE); agronomic nitrogen efficiency (AE_N) and nitrogen recovery efficiency (RE_N) in the majority of cases. Although the OPT tested in this study increased yields and nutrient uptake, there remains considerable potential to improve AE_N and RE_N further for this intensive winter wheat–summer maize rotation system.

Abbreviations: AE_N, agronomic nitrogen efficiency • CK, check without fertilizer use • FP, farmers' practice • INS, indigenous nitrogen supply • NUE, nitrogen use efficiency • OPT, optimum treatment • RE_N, nitrogen recovery efficiency

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Received for publication March 9, 2009.