| Texto completo | |
| Autor(es): |
Martins, Juliano Araujo
;
Fiorio, Peterson Ricardo
;
da Silva Barros, Pedro Paulo
;
Melo Dematte, Jose Alexandre
;
Molin, Jose Paulo
;
Cantarella, Heitor
;
Usher Neale, Christopher Michael
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ACTA SCIENTIARUM-AGRONOMY; v. 43, p. 13-pg., 2021-01-01. |
| Resumo | |
Nitrogen management in crops is a key activity for agricultural production. Methods that can determine the levels of this element in plants in a quick and non-invasive way are extremely important for improving production systems. Within several fronts of study on this subject, proximal and remote sensing methods are promising techniques. In this regard, this research sought to demonstrate the relationships between variations in leaf nitrogen content (LNC) and sugarcane spectral behaviour. The work was carried out in three experimental areas in Sao Paulo State, Brazil, with different soils, varieties and nitrogen rates during the 2012/13 and 2013/14 seasons. A significant correlation was observed between the LNC and variations in the sugarcane spectra. The green and red-edge spectral bands were the most consistent and stable predictors of LNC among the evaluated harvests. Stepwise multiple linear regression analysis (MSLR) generated better models for LNC estimation when calibrated with experimental area, independent of the variety. The present research demonstrates that specific wavelengths are associated with the variation in LNC in sugarcane, and these are reported in the green region (near 550 nm) and in the red-edge wavelengths (680 to 720 nm). These results may help in future research on the direct in situ application of nitrogen fertilizers. (AU) | |
| Processo FAPESP: | 08/56147-1 - Nutrição nitrogenada de cana-de-açúcar com fertilizantes ou bactérias diazotróficas |
| Beneficiário: | Heitor Cantarella |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa BIOEN - Temático |
| Processo FAPESP: | 13/22435-9 - Utilização de dados hiperespectrais para predição do nitrogênio foliar em cana-de-açúcar |
| Beneficiário: | Peterson Ricardo Fiorio |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa BIOEN - Regular |