American Journal of Potato Research

, Volume 96, Issue 1, pp 48–54 | Cite as

Possibility of Recommending Potassium Application Rates Based on a Rapid Detection of the Potato Petiole K Status with a Portable K ion Meter

  • Xiaohua Shi
  • Xin Zhang
  • Wenqin Kang
  • Yang Chen
  • Mingshou FanEmail author


Because of the variations in the K amount required to produce 1 t potatoes and the poor relationship between soil potassium content and potato yield, recommended K-fertilizer rates based on soil tests are unreliable for potato production. This research was set to test the possibility of establishing a potato plant K diagnosis method with a portable K ion meter. The results confirmed the luxury absorption of K by potato. Moreover, the potato petiole K content by a portable K ion meter was linearly related to the vine and tuber K contents as well as the plant accumulated K level. Therefore the petiole K concentration is a good indicator of plant K status. Furthermore, the relationship between the relative potato yield and the petiole K content fits a quadratic equation, thus the threshold petiole K content could be calculated based on the minimum petiole K content at the highest relative yield.


Debido a las variaciones en la cantidad de K requerida para producir 1 t de papas, y la pobre relación entre el contenido de potasio en el suelo y el rendimiento de papa, los niveles de fertilizantes de K recomendados con base a las pruebas del suelo, no son confiables para la producción de papa. Esta investigación se estableció para probar la posibilidad de establecer un método de diagnóstico de K en la planta de papa con un iónmetro de K portátil. Los resultados confirmaron la absorción de lujo de K por la papa. Aún más, el contenido de K en el pecíolo de la papa por el iónmetro de K portátil estuvo relacionado linealmente a los contenidos de K del follaje y del tubérculo, así como al nivel de K acumulado en la planta. De aquí que la concentración de K en el pecíolo es un buen indicador de la situación del K en la planta. Más aún, la relación entre el rendimiento relativo de la papa y el contenido de K en el pecíolo se ajusta a una ecuación cuadrática, entonces el umbral del contenido de K en el pecíolo pudiera calcularse con base en el contenido mínimo de K en el pecíolo en el rendimiento relativo más alto.


Plant K diagnosis Relative tuber yield Split application of K 



This research was financially supported by the National Natural Science Foundation of China (31760356) and the Innovation Team of Universities in Inner Mongolia of China (NMGIRT—A1602).


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Copyright information

© The Potato Association of America 2018

Authors and Affiliations

  • Xiaohua Shi
    • 1
    • 2
  • Xin Zhang
    • 1
  • Wenqin Kang
    • 1
  • Yang Chen
    • 3
  • Mingshou Fan
    • 1
    Email author
  1. 1.College of AgronomyInner Mongolia Agricultural UniversityHohhotChina
  2. 2.Inner Mongolia Seed Potato Propagation CenterHohhotChina
  3. 3.College of Grassland, Resource and EnvironmentInner Mongolia Agricultural UniversityHohhotChina

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