ArticleFrontiers in plant science2026
Impact of split application of potassium fertilizer on yield, quality, and economic benefits of winter wheat.
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
Background: Potassium (K) is essential for winter wheat growth, yield formation, and grain quality; however, it is commonly applied as a single basal dose in the Huang-Huai-Hai region despite large spatial variability in soil K availability, leading to inefficient utilization. Aims: This study aimed to evaluate K application strategies across contrasting regions and identify an optimal, site-specific K management approach. Methods: Field experiments were conducted during 2021-2022 and 2022-2023 at three sites with contrasting soil K levels. A two-factor randomized block design with three replicates was used, including two K rates (K1: 120 and K2: 60kg K Results: Basal and controlled-release treatments (T2 and T5) increased the available K in the 0-60-cm soil layer during early growth, while split application (T3 and T4) improved the K availability in the surface layer (0-30 cm) during later stages. The three-split application (T4) consistently improved K accumulation, 1, 000-grain weight, and grain yield across all sites. In high-K soils, single basal application showed no significant yield advantage, underscoring the importance of application timing. Split K application, particularly T4, also improved the grain quality traits, including protein content, wet gluten content, sedimentation value, and dough rheological properties. These improvements were associated with enhanced post-anthesis K uptake and KUE. Conclusion: Optimizing K application timing through split fertilization improves K utilization, yield, and grain quality. A site-specific strategy is recommended: 120kg K
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