Nitrogen and phosphorus fertilizer use efficiency improves alfalfa (<i>Medicago sativa</i> L.) production and performance in alkaline desert soil.

In general, compared to no-fertilization treatment, the application of N and P fertilizers resulted in increased plant height, stem thickness, crude protein, and ether extract of alfalfa, while neutral detergent fiber (NDF) and acid detergent fiber (ADF) exhibited a decreasing trend.

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In this study, CP of alfalfa showed an increasing trend at low and medium fertilizer levels but a decreasing trend at high fertilizer levels.

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Under the same N treatment, an increase in P application showed a trend of initially increasing the cumulative yield and then decreasing overtime.

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