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Avaliação temporal e espacial da produtividade de duas parcelas de olival por imagens de satélite
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Authors
Abstract(s)
Com o exponencial crescimento da cultura da oliveira em Portugal e com a sua
crescente importância nas contas da agricultura nacional, a adoção de novas
tecnologias e aplicações face aos métodos de análise e planeamento
tradicionais torna-se imperativa do ponto de vista evolutivo do setor, no sentido
de assegurar cada vez maior eficiência na produção e rentabilidade desta
cultura.
No presente estudo avaliou-se a relação entre diferentes índices de vegetação
(NDVI, NDWI, e RADAR) e parâmetros de produtividade (VC, SC, P, IM e GMS)
ao longo do ciclo vegetativo de duas variedades de oliveira (‘Galega vulgar’ e
‘Cobrançosa’). Foi estabelecido um delineamento experimental, para assegurar
representatividade e significado estatístico, que consistiu em 5 pontos/blocos na
parcela da variedade ‘Cobrançosa’ e 8 pontos/blocos na parcela da variedade
‘Galega vulgar’, cada ponto correspondendo a um conjunto de 4 árvores
consecutivas na linha.
A fenologia com base na escala BBCH foi acompanhada sendo avaliados
parâmetros como a produtividade, através da pesagem da produção individual
de cada árvore em estudo, e a sua respetiva biometria (superfície da copa e
volume da copa). Em laboratório foram ainda feitas determinações do índice de
maturação (IM) e do teor de gordura na matéria seca (GMS).
Os resultados obtidos indicam que o uso destas tecnologias (deteção remota e
índices vegetativos) apresenta potencialidades para uso alargado na olivicultura.
Verificaram-se correlações significativas entre os índices NDVI e NDWI e alguns
parâmetros da produção. As variantes NDVI’ e NDWI’ acabam, em muitos casos,
por fornecer valores ainda mais significativos que justificam a aposta numa
análise centrada na linha de oliveiras, excluindo a entrelinha. No entanto, será
necessário repetir este estudo em outras campanhas olivícolas, dada a influência
do ano agrícola no comportamento e produção da oliveira e na existência do
fenómeno de alternância da produção.
Assim, o uso deste tipo de índices demonstram ser uma ferramenta com
bastantes potencialidades numa ótica de apoio ao olivicultor, facilitando não só
na tomada de decisão para correção de situações detetadas durante o ciclo
anual da oliveira, mas contribuindo também, numa perspetiva mais ampla, para
melhoria dos parâmetros de produtividade.
With the exponential growth of the olive tree culture in Portugal and with its increasing importance in the national agricultural accounts, the adoption of new technologies and applications in relation to traditional methods of analysis and planning becomes imperative from the point of view of the evolution of the sector, in order to ensure greater efficiency in production and profitability of this crop. In the present study we evaluated the relationship between different vegetative indexes (NDVI, NDWI, and RADAR) and productivity parameters (VC, SC, P, IM and GMS) throughout the vegetative cycle of two varieties of olive tree ('Galega vulgar' and 'Cobrançosa'). An experimental design was established, to ensure representativeness and statistical significance, consisting of 5 points/blocks in the plot of the 'Cobrançosa' variety and 8 points/blocks in the plot of the 'Galega vulgar' variety, each point corresponding to a set of 4 consecutive trees in the row. The phenology based on the BBCH scale was monitored and parameters such as productivity was evaluated, by weighing the individual production of each tree under study, and its respective biometry (crown surface and crown volume). In the laboratory, the maturation index (MI) and the fat content in dry matter (GMS) were also determined. The results obtained indicate that the use of these technologies (remote sensing and vegetative indexes) presents potential for widespread use in olive cultivation. Significant correlations were found between NDVI and NDWI indexes and some production parameters. In many cases, the NDVI' and NDWI' end up providing even more significant values that justify an analysis centered on the olive tree row, excluding the between-row. However, it will be necessary to repeat this study in other olive growing seasons, given the influence of the agricultural year on the behavior and production of the olive tree and the existence of the phenomenon of alternating production. Thus, the use of this type of indices demonstrates to be a tool with great potential in a perspective of support to the olive grower, facilitating not only the decision making for correction of situations detected during the annual cycle of the olive tree, but also contributing, in a broader perspective, to improve the parameters of productivity.
With the exponential growth of the olive tree culture in Portugal and with its increasing importance in the national agricultural accounts, the adoption of new technologies and applications in relation to traditional methods of analysis and planning becomes imperative from the point of view of the evolution of the sector, in order to ensure greater efficiency in production and profitability of this crop. In the present study we evaluated the relationship between different vegetative indexes (NDVI, NDWI, and RADAR) and productivity parameters (VC, SC, P, IM and GMS) throughout the vegetative cycle of two varieties of olive tree ('Galega vulgar' and 'Cobrançosa'). An experimental design was established, to ensure representativeness and statistical significance, consisting of 5 points/blocks in the plot of the 'Cobrançosa' variety and 8 points/blocks in the plot of the 'Galega vulgar' variety, each point corresponding to a set of 4 consecutive trees in the row. The phenology based on the BBCH scale was monitored and parameters such as productivity was evaluated, by weighing the individual production of each tree under study, and its respective biometry (crown surface and crown volume). In the laboratory, the maturation index (MI) and the fat content in dry matter (GMS) were also determined. The results obtained indicate that the use of these technologies (remote sensing and vegetative indexes) presents potential for widespread use in olive cultivation. Significant correlations were found between NDVI and NDWI indexes and some production parameters. In many cases, the NDVI' and NDWI' end up providing even more significant values that justify an analysis centered on the olive tree row, excluding the between-row. However, it will be necessary to repeat this study in other olive growing seasons, given the influence of the agricultural year on the behavior and production of the olive tree and the existence of the phenomenon of alternating production. Thus, the use of this type of indices demonstrates to be a tool with great potential in a perspective of support to the olive grower, facilitating not only the decision making for correction of situations detected during the annual cycle of the olive tree, but also contributing, in a broader perspective, to improve the parameters of productivity.
Description
Keywords
Galega vulgar RADAR NDVI NDWI Cobrançosa Deteção remota Remote sensing