SPECTRAL VEGETATION INDEXES APPLIED TO NITROGEN SUFFICIENCY INDEX: A STRATEGY WITH POTENTIAL TO INCREASE NITROGEN USE EFFICIENCY ON TOMATO CROP
| Autor: | Derly Jose Henriques Silva, Francisco de Assis de Carvalho Pinto, Thiago Furtado Oliveira |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Index (economics)
precision agriculture Agriculture (General) fruit quality chemistry.chemical_element food and beverages Titratable acid 04 agricultural and veterinary sciences Vegetation tomato nutrition Agricultural and Biological Sciences (miscellaneous) Nitrogen Normalized Difference Vegetation Index S1-972 Crop chemistry Agronomy 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Precision agriculture variable rate fertilization Productivity Mathematics |
| Zdroj: | Engenharia Agrícola, Vol 39, Iss 1, Pp 118-126 (2019) Engenharia Agrícola v.39 n.1 2019 Engenharia Agrícola Associação Brasileira de Engenharia Agrícola (SBEA) instacron:SBEA LOCUS Repositório Institucional da UFV Universidade Federal de Viçosa (UFV) instacron:UFV Engenharia Agrícola, Volume: 39, Issue: 1, Pages: 118-126, Published: FEB 2019 |
| ISSN: | 0100-6916 |
| Popis: | The tomato crop is one of the most demanding of nitrogen fertilizers. This element on soil has an elevated mobility that can represent danger to the environment and reduces its efficiency. Therefore, the purpose of this study was to evaluate the methodology for recommending nitrogen fertilizer for tutored tomatoes with a variable rate based on nitrogen sufficiency index. The treatments consisted of a reference plot and five treatments with the nitrogen sufficiency index calculated on spectral indexes NDVI, GNDVI, MCARI, PSSRa and the SPAD value. The productivity was evaluated considering the fruits size and viability. The descriptors of quality, color, soluble solids, total acidity, titratable acidity and flavor were also evaluated. All the indexes evaluated decreased significantly with the applied nitrogen during the cycle, the only exception being MCARI, which resulted in a similar nitrogen quantity to the reference. The NDVI, GNDVI, PSSRa and SPAD value indexes presented a total applied nitrogen decrease varying from 25.2% to 43.8%, neither reducing significantly the productivity nor the fruits quality. The marketable fruits productivity varied from 2332.9 to 2773.8 g.plant−1 among treatments. Only the NDVI and the SPAD value presented significant improvements on the partial factor of nitrogen productivity, among the applied treatments. |
| Databáze: | OpenAIRE |
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