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• W2091330438 abstract "The intensification of agricultural production has been accompanied by an overuse of N fertilization and has accelerated global N consumption in the last 20 yr. We undertook 269 on‐farm demonstration trials to evaluate variations in the optimal N rate (ONR) and developed regional N rate guidelines for intensive wheat ( Triticum aestivum L.)–maize ( Zea mays L.) rotation systems in the North China Plain. Large variations in the ONR (coefficient of variation = 38∼39%) were observed across the 269 fields, resulting from large variations in the initial soil NO 3 –N supply before sowing. A negative linear relationship between the ONR and initial soil NO 3 –N suggested that 1 kg soil NO 3 –N ha –1 was equivalent to applications of 0.54 and 0.71 kg fertilizer N ha –1 for wheat and maize, respectively. The current cropping system, with excessive N inputs and large variations in residual NO 3 –N in the top 90‐cm soil depth (averaging 188 kg N ha –1 season –1 and ranging 20–987 kg N ha –1 season –1 ), could be transformed with optimal N management to a steady state, in which the residual NO 3 –N content is maintained at about 90 to 100 kg N ha –1 . Regional N rate guidelines should be 154 to 159 and 164 to 171 kg N ha –1 for yields of 6 and 9 Mg ha –1 for wheat and maize, respectively. This regional N rate guideline may not be completely accurate but is a robust and simple guideline acceptable to the 100 million smallholder farmers in China." @default.
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• W2091330438 date "2013-09-01" @default.
• W2091330438 modified "2023-10-16" @default.
• W2091330438 title "Development of Regional Nitrogen Rate Guidelines for Intensive Cropping Systems in China" @default.
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• W2091330438 doi "https://doi.org/10.2134/agronj2012.0398" @default.
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