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Measuring the Influence of Key Management Decisions on the Nitrogen Nutritional Status of Annual Ryegrass-Based Forage Crops
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Orientador(es)
Resumo(s)
Increasing nitrogen use efficiency (NUE) by improving agricultural practices and soil
knowledge, and implementing precision agriculture, is essential to reduce the overuse of fertilizers
and increase nutrient retention. This study aimed to optimize N management in agriculture by
establishing a critical N dilution curve (CNDC) and analyzing variations in NUE and the N nutrition
index (NNI) among different crops under various treatments. Using a Bayesian model, the CNDC
was determined as %Nc = 3.63 × PDM−0.71. The results showed that plant dry matter (PDM) and
plant N content (PNC) varied significantly with crop type and sampling moments. Strong positive
correlations are presented by PDM with N uptake (NUp) (0.89) and NNI (0.88), along with an
inverse correlation with critical N concentration (−0.95). The study found that crops under irrigation
conditions had higher NUp and higher NNI. This study provides valuable insights into the influence
of key management decisions on the N nutritional status of annual ryegrass-based forage crops. The
results highlight the critical role of accurate and conscious decision-making in improving NUE and
crop yields, emphasizing the complex interactions between biomass production and N dynamics in
crops. The conclusions allow significant benefits to be realized, contributing to the sustainability of
agricultural systems.
Descrição
Palavras-chave
critical nitrogen concentration data-driven approach crop yield site-specific analysis sustainability variable rate fertilization
Contexto Educativo
Citação
Silva, L.; Barbosa, S.; Lidon, F.C.; Santos-Silva, J.; Conceição, L.A. Measuring the Influence of Key Management Decisions on the Nitrogen Nutritional Status of Annual Ryegrass-Based Forage Crops. Agronomy 2024, 14, 1817. https:// doi.org/10.3390/agronomy14081817