Optimal N management affects the fate of urea-¹⁵N and improves N uptake and utilization of wheat in different rotation systems.

Compared with rice, the preceding maize treatment showed an obvious trend of increasing spikes and kernels per spike, but decreasing 1000-grain weight under the same N rate. 3.5.

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In grain, the preceding maize treatment showed a trend of increasing Ndff but decreasing Ndfs compared with the preceding rice treatment.

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