Optimizing foliar N-fertilization in sugarcane depends on plant genotype and nitrogen concentration
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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 15N-urea at five nitrogen concentrations. NRP was assessed at five time points for roots, stalk, old leaves, 15N-urea-fertilized leaves (15NL), 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 15N-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 15N-urea, followed by the UEL. Genotypes differed in the leaf scorching intensity, which increased with higher concentration of 15N-urea. Genotypes also differed in the 15N-urea uptake rate, down-regulated by the N content in the 15NL. 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.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | e14085 |
| Tidsskrift | Physiologia Plantarum |
| Vol/bind | 175 |
| Udgave nummer | 6 |
| Antal sider | 15 |
| ISSN | 0031-9317 |
| DOI | |
| Status | Udgivet - 2023 |
Bibliografisk note
Funding Information:
This research was supported by the São Paulo Research Foundation (FAPESP), grant #2017/24516‐7 to PCOT. SAQC received a Ph.D. scholarship from FAPESP, grant #2017/25489‐3. The authors thank the technicians (Ana Paula G. de M. Duarte and Hugo H. Batagello) and the internships of the Stable Isotope Laboratory from the Center of Nuclear Energy in Agriculture (LIE/DVTEC/CENA/USP) for helping with the laboratory analyses, Prof. Adriana Pinheiro Martinelli (DVPROD/CENA/USP) for allowing the use of the microscope and Prof. Elliot Kitajima (LME/ESALQ/USP) for support access to the scanning electron microscope. SAQC thanks the FAPESP for the financial support during the Ph.D., the University of São Paulo for the greenhouse structure, Prof. Marcílio de Almeida and Dra. Erika Mendes Graner for the teachings and discussions throughout the plant anatomy course, and Dra. Nicole C. Cheng and the bachelor's students (Régis R. L. Vieira and Eluisa R. Elias) for their help at each time of plant sampling.
Funding Information:
This research was supported by the São Paulo Research Foundation (FAPESP), grant #2017/24516-7 to PCOT. SAQC received a Ph.D. scholarship from FAPESP, grant #2017/25489-3. The authors thank the technicians (Ana Paula G. de M. Duarte and Hugo H. Batagello) and the internships of the Stable Isotope Laboratory from the Center of Nuclear Energy in Agriculture (LIE/DVTEC/CENA/USP) for helping with the laboratory analyses, Prof. Adriana Pinheiro Martinelli (DVPROD/CENA/USP) for allowing the use of the microscope and Prof. Elliot Kitajima (LME/ESALQ/USP) for support access to the scanning electron microscope. SAQC thanks the FAPESP for the financial support during the Ph.D., the University of São Paulo for the greenhouse structure, Prof. Marcílio de Almeida and Dra. Erika Mendes Graner for the teachings and discussions throughout the plant anatomy course, and Dra. Nicole C. Cheng and the bachelor's students (Régis R. L. Vieira and Eluisa R. Elias) for their help at each time of plant sampling.
Publisher Copyright:
© 2023 Scandinavian Plant Physiology Society.
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