Optimizing nitrogen fertilizer for improved root growth, nitrogen utilization, and yield of cotton under mulched drip irrigation in southern Xinjiang, China.

The results of multiple linear regression analysis showed that there was a significant positive correlation between nitrogen application rate and dry matter quality score (β = 0.658, p = 0.004) in 2021, and a highly significant positive correlation between nitrogen application rate and dry matter quality score (β = 1.435, p = 0.001) in 2022 (Table S1).

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Initially, seed cotton yield exhibited an increasing trend with the N application rate, but subsequently declined upon surpassing a certain threshold.

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