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American Journal of Potato Research

, Volume 95, Issue 5, pp 539–548 | Cite as

Effects of Foliar and Tuber Sprout Suppressants on Storage of Ware Potatoes under Tropical Conditions

  • R. O. Nyankanga
  • W. W. Murigi
  • S. I. Shibairo
  • O. M. OlanyaEmail author
  • R. P. Larkin
Article
  • 180 Downloads

Abstract

Potato (Solanum tuberosum L.) is an important source of dietary carbohydrate and cash income generation for farmers in the tropical highlands of Kenya. The feasibility for cold storage at the farm level is limited due to the high costs of maintaining such a facility and there is limited data on the long-term post-harvest storage and quality of tubers of tropical-adapted cultivars. Application of sprout suppressants to control premature sprouting of ware potato is an attractive proposition. The objectives of this study were to evaluate the efficacy of pre-harvest foliar applications of paclobutrazol (PBZ) and ethephon for sprout suppression on ware potato tubers in storage. Post-harvest spray applications of Isopropyl N-(3-chlorophenyl carbamate) chloropropham (CIPC) and 1,4-dimethylnaphthalene (DMN) on tubers as fog was also evaluated. Potato cultivars had varying levels of tuber dormancy. The tubers were stored at ambient temperature (23 C) and evaluated weekly for 24 weeks for percent of tubers sprouting, length of longest sprouts, tuber weight loss and assessed for dormancy for 24 weeks. Paclobutrazol prolonged tuber dormancy by 21–31 days and reduced tuber weight loss. Ethephon treatment had no effect on dormancy and tuber weight loss. Potato tubers treated with CIPC had greater sprout control than the other treatments in storage. Tuber response to DMN treatment varied among the three potato cultivars evaluated. The findings from this study imply that PBZ is effective in prolonging potato tuber dormancy for short-term basis at 23 C, while CIPC applied on tubers was effective for long term storage. Optimization of post-harvest potato storage can improve food security in the highland tropics.

Keywords

Sprout inhibitors Solanum tuberosum Post-harvest Weight loss Tropical highlands 

Resumen

La papa (Solanum tuberosum L.) es una fuente importante de carbohidratos en la dieta y de generación de ingresos para agricultores en los altiplanos tropicales de Kenia. La factibilidad para almacenamiento en frío a nivel de campo es limitada debido a los altos costos del mantenimiento de tales instalaciones y hay datos limitados en el almacenamiento postcosecha a largo plazo y la calidad de los tubérculos de variedades adaptadas al trópico. La aplicación de inhibidores de la brotación para controlar la brotación prematura de papa de consumo es una propuesta atractiva. Los objetivos de este estudio fueron evaluar la eficacia de aplicaciones foliares pre-cosecha de paclobutrazol (PBZ) y de etefon para inhibir brotación en tubérculos de consumo en almacenamiento. También se evaluaron aplicaciones por aspersión en postcosecha de Isopropil N-(3-clorofenil carbamato), chloroprofam (CIPC), y 1, 4-dimetilnaftaleno (DMN), en tubérculos en nebulización. Las variedades de papa tuvieron diversos niveles de dormancia del tubérculo. Estos fueron almacenados a temperatura ambiente (23 C) y evaluados semanalmente por 24 semanas para porcentaje de tubérculos brotados, longitud de los brotes más largos, pérdida de peso del tubérculo y analizados para dormancia por 24 semanas. Paclobutrazol prolongó la dormancia por 21–31 días y redujo la pérdida de peso del tubérculo. El tratamiento con etefon no tuvo efecto en el período de dormancia ni en la pérdida de peso. Los tubérculos tratados con CIPC tuvieron un mayor control de brotación que los otros tratamientos en el almacén. La respuesta de los tubérculos al tratamiento con DMN varió entre las tres variedades evaluadas. Lo que se encontró de este estudio implica que PBZ es efectivo en la prolongación de dormancia en tubérculos de papa con base a corto plazo a 23 C, mientras que CIPC aplicado en tubérculos fue efectivo para almacenamiento a largo plazo. La optimización del almacenamiento postcosecha puede mejorar la seguridad alimentaria en los altiplanos tropicales.

Notes

Acknowledgements

The authors are grateful to the Kenya Agricultural and Livestock Research Institute, Tigoni and the University of Nairobi, Kabete Campus for field sites for cultivation of potato cultivars and production of tubers used in this research. We are grateful to the University of Nairobi, Kibabii University and the USDA-Agricultural Research Service for technical and logistical support.

Compliance with Ethical Standards

Declaration

The experiments comply with the current laws of Kenya and ethical standards or requirements were met.

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Copyright information

© The Potato Association of America 2018

Authors and Affiliations

  1. 1.Department of Plant Science and Crop ProtectionUniversity of NairobiNairobiKenya
  2. 2.Kibabii UniversityBungomaKenya
  3. 3.Eastern Regional Research Center, Food Safety and Intervention Technologies Research UnitUSDA-ARSWyndmoorUSA
  4. 4.New England Plant, Soil, and Water LaboratoryUSDA-ARSOronoUSA

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