Resumo

BURGOS, Angela María; MICHELLOD, Alcides M. M.; PORTA, Miriam  e  HACK, Claudina María. Production and nutritional value of Manihot esculenta Crantz leaf residue during two production cycles. Pastos y Forrajes [online]. 2024, vol.47  Epub 23-Dez-2024. ISSN 2078-8452.

Objective: To characterize the production dynamics and nutritional value of fresh and dry leaf biomass resulting as agricultural residue from root production of Manihot esculenta Crantz.

Materials and Methods: The experimental site was the Experimental Field of the School of Agricultural Sciences of the National Northeast University in Corrientes, Argentina. The evaluated cultivars were Verde Santa Ana, Amarilla Marcelo, Palomita, Blanca de Santa Catarina, Rocha, Ramada Paso and Yerutí, each of which constituted a treatment and were distributed in randomized complete blocks with three replicas. Sampling was carried out at seven times during the 18 months of the crop cycle and in each instance the fresh and dry biomass of leaves, crude protein content and digestibility of the samples were determined. Analysis of variance and separation of means by Duncan’s test (0,05 %) were performed.

Results: Average dry biomass production was 649 kg ha-1 and varied among harvest times, with significant reductions during the winter break. Average fresh and dry leaf biomass production at 18 months statistically exceeded all other samplings (p ≤ 0,0001) and reached values of 5 390,9 and 1 240 kg ha-1, respectively. Crude protein percentages and digestibility varied significantly over time, with averages of 22,5 and 47,4 %, respectively.

Conclusion: The results showed a significantly higher production of fresh and dry biomass during the months of active growth, while production was significantly reduced during winter. In addition, there were variations in crude protein concentration and leaf biomass digestibility during the experiment. The studies contribute to the understanding of biomass production dynamics in M. esculenta. These findings may have implications for the improvement of sustainable agricultural practices and the development of new feedstuffs derived from this plant for animal production.

Palavras-chave : forage; nitrogen feedstuff; nutrition; yield.

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