The nitrogen nutrition of yam (Dioscorea spp)
2020
K. V., Hgaza | Oberson, A. (Astrid) | Kiba, Innocent Delwende | Diby, Lucien N'Guessan | Ake, Severin | Frossard, Emmanel
Information on the nitrogen (N) nutrition of yam (Dioscorea spp) is limited. Our objective was to elucidate the factors controlling N uptake by D. rotundata and D. alata. We analyzed results obtained with improved cultivars of these species grown in three field experiments among which ¹⁵N-fertilizer was used in one. Plant biomass production, leaf area index (LAI), root length density, N and ¹⁵N uptake by the plant were measured in these experiments. Nitrogen uptake was controlled in both species by plant demand and N inputs. A positive relation was observed between N uptake and LAI. Despite the small root system, the ability of the plant to take N up was high. The amount of N derived from the fertilizer recovered in the plant was explained by total N uptake. Finally, avenues to improve the low nitrogen fertilizer recovery (<20%) in yam are discussed.
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