International Journal of Agricultural Policy and Research

Original Research Article

Effect of nutrient management and time of vine cutting on orange and white-fleshed sweetpotato varieties in Southern Nigeria

Fidel Emmanuel Akpaninyang1*, Dominic Aja Okpara2, Okon John Ekwere1 and Patrick Ibanga Udounang1

1Department of Crop Science, Faculty of Agriculture, Akwa Ibom State University, Obio Akpa Campus, Akwa Ibom State, Nigeria.
2College of Crop and Soil Sciences, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria.

*Corresponding Author Email : fidelekan(at)

Tel.: +2348021033194

Fidel Emmanuel Akpaninyang

Dominic Aja Okpara

Okon John Ekwere

Patrick Ibanga Udounang

Article Number: IJAPR.22.007  |   Pages: 44-51  |   Vol. 10 (2), March 2022   |   DOI:

 Received: December 15, 2021  Accepted: February 9, 2022  Published: March 10, 2022


The study was conducted in 2016 and 2017 cropping seasons at the research farm of Akwa Ibom State University, Obio Akpa, Nigeria to examine the effects of nutrient management, vine cutting time and variety on growth, yield and quality of sweetpotato. The experiment was laid out as split-split plot in a randomized complete block design with three replications. Results revealed that a combination of 2.5t/ha poultry manure + 200kg/ha NPK fertilizer or poultry manure alone significantly increased vine length, number of branches/plant, shoot dry matter and fresh shoot biomass compared to application of 400kg/ha inorganic NPK fertilizer alone and the no fertilizer application. The highest storage root yield and carotenoid content were obtained from combined application of 2.5t/ha poultry manure + 200kg/ha NPK fertilizer. A mixture of manure and fertilizer also significantly reduced decay of storage roots. No vine cutting significantly increased fresh shoot biomass but reduced carotenoid content compared to cutting at 16 or 17 WAP, while date of cutting had no effect on storage root yield. Sweetpotato variety white – fleshed TIS 87/0087 had significantly higher fresh shoot biomass and storage root yield than orange – fleshed Umuspo 3 but carotenoid content was higher in the latter than the former.


Nutrient, vine cutting, quality, yield, sweetpotato.

How to Cite this Article

Akpaninyang FE, Okpara DA, Ekwere OJ, Udounang PI(2022).Effect of nutrient management and time of vine cutting on orange and white-fleshed sweetpotato varieties in Southern Nigeria. Int. J. Agric. Pol. Res. 10(2):44-51.DOI:

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