Effects of Water-Nitrogen Management on the Growth and Nitrogen Uptake and Utilization of Intercropped Alfalfa.

(3) Irrigation and nitrogen application had highly significant effects on alfalfa hay yield ( p < 0.01).

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Root weight distribution showed a decreasing trend with increasing soil depth.

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Under the same irrigation level, root weight showed a trend of first increasing and then decreasing with increasing nitrogen application, reaching a maximum at the N2 level, with average increases of 19.2%, 10.6%, and 7.4% compared to N0, N1, and N3, respectively.

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