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<p>Potassium (K) and phosphorus (P) ensure balanced fertilization for improved potato yield, quality, plant uptake, and efficiency of nutrient use. This study evaluated the interactive effects of K and P on potato tuber yield and soil K availability in northeast Florida.&#xa0;A two-year field experiment was conducted in Hastings, Florida, during the 2022 and 2023 growing seasons as a split-block design with four replications, testing three P application rates (56, 112, and 168&#xa0;kg P<sub>2</sub>O<sub>5</sub> ha<sup>− 1</sup>) and six K application rates (0, 112, 224, 336, 448, and 560&#xa0;kg K<sub>2</sub>O ha<sup>− 1</sup>).&#xa0;The main effect of K and P application rates significantly affected the potato tuber yield, while no significant K and P interaction was observed. The extractable soil K and the total uptake increased with different K application rates. Based on the quadratic regression response, the agronomic optimum K rate recommendation was 308 and 307&#xa0;kg K<sub>2</sub>O ha<sup>− 1</sup> for respective maximum total and marketable yields of 26.9 and 21.8 Mg ha<sup>− 1</sup>. The specific gravity decreased at the highest K rate applied however remained within the acceptable standards. Although a higher K fertilizer application increased P use efficiency, but the benefit–cost ratio decreased due to diminishing economic returns.&#xa0;Achieving optimal potato yield in Florida’s sandy soils requires higher K application compared to the current recommendations due to the higher plant K uptake requirements. Simultaneously, an optimum K application is necessary to enhance P fertilizer use efficiency.</p>

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Potassium and Phosphorus Response to Nutrient Uptake, Soil Availability, and Potato Yield in Sandy Soils

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Simranpreet K. Sidhu,
  • Lincoln Zotarelli,
  • Lakesh K. Sharma

摘要

Potassium (K) and phosphorus (P) ensure balanced fertilization for improved potato yield, quality, plant uptake, and efficiency of nutrient use. This study evaluated the interactive effects of K and P on potato tuber yield and soil K availability in northeast Florida. A two-year field experiment was conducted in Hastings, Florida, during the 2022 and 2023 growing seasons as a split-block design with four replications, testing three P application rates (56, 112, and 168 kg P2O5 ha− 1) and six K application rates (0, 112, 224, 336, 448, and 560 kg K2O ha− 1). The main effect of K and P application rates significantly affected the potato tuber yield, while no significant K and P interaction was observed. The extractable soil K and the total uptake increased with different K application rates. Based on the quadratic regression response, the agronomic optimum K rate recommendation was 308 and 307 kg K2O ha− 1 for respective maximum total and marketable yields of 26.9 and 21.8 Mg ha− 1. The specific gravity decreased at the highest K rate applied however remained within the acceptable standards. Although a higher K fertilizer application increased P use efficiency, but the benefit–cost ratio decreased due to diminishing economic returns. Achieving optimal potato yield in Florida’s sandy soils requires higher K application compared to the current recommendations due to the higher plant K uptake requirements. Simultaneously, an optimum K application is necessary to enhance P fertilizer use efficiency.