The fate of nitrogen from different sources in a rice-wheat rotation system - A ¹⁵N labeling study.

Although the utilization rate showed a decreasing trend, there was no significant change in the soil residual rate (basically maintained at 40%); it seemed likely that there was still a potential for fertilizer nitrogen to be recovered in the later stage.

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There was a highly significant positive correlation among NTE, NCR, and NHI, indicating that nitrogen accumulation in the vegetative organs before anthesis was necessary due to the great significance for grain-filling, transport, and distribution of nitrogen after anthesis.

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