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Optimising Legume Integration, Nitrogen Fertilisation, and Irrigation in Semi-Arid Forage Systems
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Orientador(es)
Resumo(s)
Monoculture systems depend on high nitrogen (N) fertilisation. Incorporating
legumes into forage crops offers a sustainable alternative with agronomic and economic
benefits. This study assesses the impact of legumes in fodder systems, evaluating yield, N
use efficiency (NUE), and profitability while identifying the best cropping strategy under
semi-arid conditions. The experiment, conducted at Herdade da Comenda, Elvas, Portugal,
used a split–split-plot randomised block design to analyse N doses, forage species, and
irrigation. Economic metrics, including costs, net revenue, return on investment, and risk
analysis, were also assessed. Moderate N doses (120 kg ha−1
) resulted in significantly higher
NUE (15.67 kg kg−1 N) than higher doses (200 kg ha−1
), which yield only 1.40 kg kg−1 N
(p < 0.05), particularly in mixed fodder crops. Irrigation improved N absorption, crop nutrition, and yield, leading to higher profitability despite increased initial costs. Agronomically,
irrigation and N doses influenced yield and nutrient uptake, while no significant differences
were observed between different forage crops in terms of yield or NUE. Economically, the
irrigated mixed crop showed the highest return on investment (ROI = 247.37 EUR ha−1
),
whereas ryegrass presented lower financial risk (BE = 2213.24 kg ha−1
) due to lower establishment costs. Yield was the strongest predictor of net profit (R2 = 0.89). Looking ahead,
optimising N management, irrigation strategies, and mixed grass–legume crops will be
crucial to maximising economic returns while minimising environmental impacts.
Descrição
Palavras-chave
management environment grass–legume net revenue yield modelling profitability data-analysis