Alfalfa adapts to soil nutrient surplus and deficiency by adjusting the stoichiometric characteristics of main organs and nutrient reabsorption.

With increasing P application, P content in different organs showed a trend of first increasing and then stabilizing.

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With the increase of N application, the N:P ratios in all organs showed an increasing trend.

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With the increase of P application, the N:P ratios in all organs showed a decreasing trend (Fig. 7 , Table S3).

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