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Due to the relatively late start of organic rice (Oryza sativa L.) research in China, there is a still lack of systematic research on rice varieties, organic fertilizer management practices, and especially the mechanisms of nitrogen (N) uptake and utilization. Three rice varieties, Nanjing 5055, Nanjing 9108, and Nanjing 46, were grown under organic farming (OF) at three organic fertilizer levels...
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