ABSTRACT A two-year field experiment was conducted to explore the effects of different potassium fertilizer types and dosages on cotton yield, soil available potassium and leaf photosynthetic capacity. The experiment included seven treatments: (1) No potassium fertilizer (Control); (2) potassium chloride (PC) applied at 126 kg ha−1 (70% PC); (3) PC applied at 180 kg ha−1 (100% PC); (4) potassium sulfate (PS) applied at 126 kg ha−1 (70% PS); (5) PS applied at 180 kg ha−1 (100% PS); (6) polymer-coated potassium chloride (PCPC) mixed with PS (ratio 7:3) applied at 126 kg ha−1 (70% mix); and (7) PCPC mixed with PS (7:3 ratio) applied at 180 kg ha−1 (100% mix). Under the same potassium application rate, the lint yield of the mix treatments increased by 4.48–9.38% compared with the other potassium fertilizer treatments . The yield and net profit of the 70% mix treatment were similar to 100% PS and markedly higher than 100% PC. In addition, the 70% mix treatment could still enhance the soil available potassium content and leaf photosynthesis. Overall study indicated that 70% mix treatment could be effective for cotton production.

中文翻译：

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不同钾肥类型和用量对棉花产量、土壤速效钾和叶片光合作用的影响

摘要 通过为期两年的田间试验，探讨了不同钾肥类型和用量对棉花产量、土壤速效钾和叶片光合能力的影响。试验包括七个处理：（1）不施钾肥（对照）；(2) 氯化钾 (PC) 施用量为 126 kg ha-1（70% PC）；(3) PC 施用量为 180 kg ha-1 (100% PC)；(4) 硫酸钾 (PS) 施用量为 126 kg ha-1 (70% PS)；(5) 以 180 kg ha-1 (100% PS) 施用 PS；(6) 聚合物涂层氯化钾 (PCPC) 与 PS 混合（比例 7:3），施用量为 126 kg ha-1（70% 混合）；(7) PCPC 与 PS 混合（比例为 7:3），施用量为 180 kg ha-1（100% 混合）。在施钾量相同的情况下，与其他钾肥处理相比，混合处理的皮棉产量提高了4.48-9.38%。70% 混合处理的产量和净利润与 100% PS 相似，明显高于 100% PC。此外，70%混合处理仍能提高土壤速效钾含量和叶片光合作用。总体研究表明，70%的混合处理对棉花生产有效。