Resumo

VELOSO, Anabela; MANO, Raquel  e  FERREIRA, Maria Elvira. Yield and mineral composition sweetpotato ‘Lira’. Rev. de Ciências Agrárias [online]. 2023, vol.46, n.1, pp.81-90.  Epub 10-Abr-2023. ISSN 0871-018X.  https://doi.org/10.19084/rca.29437.

The present study aimed to evaluate the biomass production and mineral composition of sweetpotato plant cultivar ‘Lira’ produced in south-west Portugal, in order to obtain information for the fertilizer recommendations of this crop. The biomass and mineral contents of N, P, K, Ca, Mg, Fe, Mn, Zn, Cu and B were determined in plant fractions: vines, storage roots and absorbent roots. The production of storage roots was 542,1 g per plant. At harvest, 67 % of the dry matter was accumulated in storage roots, 27 % in vines, and 6 % in the absorbent roots. The decreasing order of nutrient accumulation by storage roots was K > N > P> Ca > Mg > Mn > Fe > Zn > B > Cu and by vines was K > N > Ca > Mg > P > Mn > Fe> Zn > B > Cu. The storage roots exported, per tonne of fresh weight, the following amounts of nutrients: 2.65 kg t-1 of N; 0.40 kg t-1 of P; 3.45 kg t-1 of K; 0.26 kg t- 1 of Ca, 0.24 kg t-1 of Mg, 4.42 g t-1 of Fe; 5.71 g t-1 of Mn; 2.70 g t-1 of Zn; 0.96 g t-1 of Cu and 1.33 g t-1 of B.

Palavras-chave : Ipomoea batatas (L.) Lam.; biomass; nutrients; storage roots..

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