ArticleFrontiers in plant science2026
The reduction of nitrogen fertilizer combined with humic acid application improves potato yield by modulating soil microbial community structure in arid and semi-arid regions.
Article in Frontiers in plant science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: Humic acid is a biostimulant with considerable potential to reduce nitrogen (N) fertilizer input and improve fertilizer use efficiency. However, the mechanisms by which it regulates soil nutrient supply, N utilization, and yield formation in potato remain unclear. Methods: A single-site, single-season field experiment was conducted in the northern Yinshan Mountains using a randomized block design with a 3 × 3 factorial arrangement of N rates and humic acid applications. Three N levels (300, 270, and 240 kg N ha Results: Compared with the conventional N input without humic acid treatment (H0N1), a 20% reduction in N input combined with 15 L ha Discussion: Partial least squares path modeling indicated that soil nutrient availability was the strongest direct factor associated with potato yield, whereas humic acid was indirectly associated with yield through changes in microbial community structure, microbial biomass and potential enzyme activities, and soil nutrient availability. Under the conditions of this experiment, reducing N input by 20% combined with 15 L ha
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