| Texto completo | |
| Autor(es): |
de Castro, Saulo Augusto Quassi
;
Sermarini, Renata Alcarde
;
Rossi, Monica Lanzoni
;
de Castro, Renata Rebellato Linhares
;
Trivelin, Paulo Cesar Ocheuze
;
Linhares, Francisco Scaglia
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSIOLOGIA PLANTARUM; v. 175, n. 6, p. 15-pg., 2023-11-01. |
| Resumo | |
Foliar N-fertilization (FNf) has emerged as a promising approach to synchronize plant nitrogen (N) demands and application timing, reducing the N losses to the environment associated with traditional soil-based fertilization methods. However, limited information exists regarding the effectiveness of FNf in sugarcane. This study aimed to optimize FNf in sugarcane by evaluating N-fertilizer recovery by the plant (NRP) and assessing potential toxicity effects. Four sugarcane genotypes were subjected to FNf using N-15-urea at five nitrogen concentrations. NRP was assessed at five time points for roots, stalk, old leaves, N-15-urea-fertilized leaves ((NL)-N-15), and unexpanded leaves (UEL). Leaf scorching, indicating FNf toxicity, was analyzed using morpho-anatomical and histochemical techniques. The results showed that FNf promoted high NRP, with an average recovery of 62.3%. Surprisingly, the redistribution of N-15-urea did not follow the nitrogen uptake rate by sugarcane leaves, with an average of 41.3% of the total-NRP. The stalk emerged as the primary sink for N-15-urea, followed by the UEL. Genotypes differed in the leaf scorching intensity, which increased with higher concentration of N-15-urea. Genotypes also differed in the N-15-urea uptake rate, down-regulated by the N content in the (NL)-N-15. These findings emphasize that by carefully choosing the appropriate genotype and nitrogen concentration, FNf can significantly enhance N-fertilizer uptake, resulting in potential environmental and economic benefits. (AU) | |
| Processo FAPESP: | 17/24516-7 - Manejos especiais da adubação nitrogenada em cultivos de cana-açúcar, milho e feijoeiro visando aumento na eficiência de uso de N e da produtividade agrícola |
| Beneficiário: | Paulo Cesar Ocheuze Trivelin |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 17/25489-3 - Uso do nitrogênio (15N) pela cana-de-açúcar submetida à adubação nitrogenada com "spray foliar" (N-Ureia) como complemento à aplicação do nutriente no solo |
| Beneficiário: | Saulo Augusto Quassi de Castro |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |