Produção de Vigna subterranea (L.) Verdc. e composição nutricional sob diferentes doses de cama de aviário.

Abstract

Bambara groundnut (Vigna subterranea (L.) Verdc.) stands out among legumes due to the high nutritional value of its grains and its adaptation to environments with restrictive edaphoclimatic conditions. However, crop performance depends, among other factors, on an adequate nutrient supply. In this context, the use of poultry litter as an organic fertilizer represents a sustainable alternative to mineral fertilizers, as it promotes the recycling of agricultural residues, improves soil fertility, and gradually supplies nutrients to plants. Thus, the objective of this study was to evaluate the effects of different poultry litter rates on the production and nutritional composition of V. subterranea. The experiment was conducted in a completely randomized design, with five poultry litter levels and five replications. The fertilizer rates were 0 kg, 1.4 kg, 2.8 kg, 4.2 kg, and 5.6 kg of poultry litter. The rates of 4.2 and 5.6 kg provided the best responses for most agronomic variables related to yield and biomass accumulation. Regarding nutritional composition, fertilization influenced some variables of the shoot plus root and the crude protein content of the grains, with the 2.8 kg rate standing out for the latter variable. It was concluded that poultry litter has potential as an alternative organic fertilizer for Bambara groundnut cultivation under Amazonian conditions, contributing to the agronomic performance of the crop and to the improvement of specific attributes of its nutritional quality.