Effects of nitrogen level on growth, nutrient uptake, and nitrogen use efficiency in cotton seedlings
Dandan Chen
A B , Zhao Zhang A , Honghong Wu A B * and Guozheng Yang A *
A
B
Handling Editor: Sergey Shabala
Abstract
Cotton, as a globally important economic crop, has high nitrogen (N) demand but low N uptake and N utilization efficiency (NUE). Optimizing N input by improving NUE represents a critical challenge for sustainable cotton production. We applied six N levels (0, 0.04, 0.4, 1, 4, 8 mM Ca(NO3)2, designated as N0, N0.04, N0.4, N1, N4, and N8, respectively) to examine their effects on morphology, biomass, nutrient absorption, and NUE at four treatment durations. Results showed that seedling growth and nutrient accumulation initially increased and subsequently decreased with increasing N levels. The optimal N ranges for seedling growth at 7, 14, 21 and 28 d were 0.4, 0.4–1, 1–4 and 4–8 mM Ca(NO3)2, respectively. Under optimal N, seedlings achieved maximum accumulations of N, P, K, and Ca (55.8, 8.8, 64.9, and 26.2 mg/plant at 28 d, respectively), while maintaining consistent N:P:K:Ca ratios of approximately 1:0.2:1.2:0.5 across seedling stage. Under low N, nutrients were preferentially allocated to roots, promoting root growth. NUE exhibited positive correlations with root traits and nutrient proportion, whereas shoot traits showed positive associations with nutrient accumulation and shoot nutrient proportion. These findings provide a theoretical basis for scientific fertilization, and establish a theoretical foundation for understanding the physiological mechanisms of efficient N use in cotton.
Keywords: biomass accumulation, cotton seedling, macronutrient, morphological changes, nitrogen level, nitrogen use efficiency, nutrient distribution, root growth.
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