Journal of Zhejiang Agricultural Sciences ›› 2026, Vol. 67 ›› Issue (5): 1112-1116.DOI: 10.16178/j.issn.0528-9017.20250499

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Effect of increased potassium application rates on growth and nutrient contents in greenhouse-cultivated pepper

FU Hongfei(), GUO Saisai, NIE Zhixing, ZHENG Jirong   

  1. Institute of Vegetables,Hangzhou Academy of Agricultural Sciences,Hangzhou 310024,Zhejiang
  • Received:2025-07-10 Online:2026-05-11 Published:2026-05-12

Abstract:

To investigate the effects of potassium fertilizer on pepper growth,using Hangjiao Zaoxiu as the material,this study examined the effect of different potassium application rates during the top-dressing period on the agronomic traits,yield,and nutrient contents of peppers,and conducted a correlation analysis between potassium application rates and pepper nutrient content. The results showed that compared with potassium application rate (based on K2O, the same as below) of 120 kg·hm-2(CK),potassium application rate of 180 kg·hm-2 significantly(p<0.05)increased the nitrogen,phosphorus,and potassium content of pepper leaves by 3.39,0.17,and 0.49 mg·g-1,respectively. The nitrogen and phosphorus content of pepper fruits significantly increased by 1.68 and 0.18 mg·g-1,respectively. The phosphorus content of pepper stems significantly increased by 0.25 mg·g-1,and the phosphorus content of pepper roots significantly increased by 0.20 mg·g-1. Furthermore,potassium application rate of 240 kg·hm-2 resulted in a significant increase of 1.67 mm in transverse diameter of pepper fruits compared with CK. However,it also led to a significant decrease of 1.33 in fruit shape index along with a significant reduction of amino acid content by 9.17 μmol·g-1 compared with CK. Moreover,compared with potassium application rate of 180 kg·hm-2,it inhibited the absorption and accumulation of nitrogen,phosphorus,and potassium by pepper leaves,possibly due to excessive application of potassium fertilizer.

Key words: potassium fertilizer, pepper, agronomic trait, nutrient content, correlation analysis

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