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Effects of water and nitrogen regulation on alfalfa stem thickness. Note: Different lowercase letters indicate that there are significant differences between different nitrogen application rates under the same irrigation amount (p < 0.05). In the analysis of variance, * and ** indicated that the correlation reached a significant level (p < 0.05) and a very significant level (p < 0.01), respectively, and ns indicated that the correlation was not significant (p > 0.05).
