*Gerald Kyalo1, Elizabeth Akiror2, Julius Mwine2, Joseph Masereka2, Sam Namanda1, Robert O.M. Mwanga1, Peter Lule3, Ben Lukuyu3, Sarah Mayanja1 and Diego Naziri1
*corresponding author: Field Crops Agronomist, CIP Kampala; +256774431623
Sweetpotato vine is a common fodder used by small-scale pig farmers in Uganda. Vines are usually obtained at time of root harvesting but it is also possible to partially remove them during the production cycle (detopping). However, vine harvesting from sweetpotato gardens to be used either as fresh fodder or processed into silage might compromise the root yield at harvest. A study was conducted to determine the effect of detopping on root and vine yield of different sweetpotato varieties in Uganda. Experiments were set up on-station at Uganda Martyrs University farm and on-farm in Kamuli and Masaka districts in 2015 and 2016 using four sweetpotato varieties [NASPOT 11, NASPOT 12 O (orange), NASPOT 13 O and a local variety]. The experiments were laid out in a randomized complete block design (RCBD) with four replicates. Data were collected on fresh root and vine weight at harvest, incidence and severity of sweetpotato virus disease (SPVD), Alternaria blight and weevil damage. Vines were harvested at 80 (detopped crop) and 140 days (undetopped crop) after planting. Data were analyzed using Genstat 12th edition. There was a significant difference (P<0.05) in the root yields of the different varieties for the detopped crop and the non detopped crop. The detopped crop had lower root yields than the undetopped by 57.5% (local variety), 4.9% (NASPOT 12 O) and 27% (NASPOT 13 O) while for NASPOT 11 detopping led to a 12% increase in root yield. Detopped NASPOT 11 in second season of 2015B had 11% higher vine yield than the un detopped crop. The rest of the varieties had lower vine yields in the detopped than the undetopped crop. All varieties had moderate resistance to SPVD and Alternaria blight. NASPOT 11 responded better to vine harvesting and should be recommended as a dual-purpose variety.
Key words: sweetpotato, pig feed, vines, Uganda
Subjects: MPU CoP
Publication Date: 2017
Rights: Attribution 4.0 International (CC BY 4.0) - You can copy, distribute, display and perform the work and evolved versions of it. You must give the original creator credit for the work.