PPGEA

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Navegando PPGEA por Assunto "Agrometeorologia"

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    Eficiência de modelos de estimativa via sensoriamento remoto na evapotranspiração e coeficiente de cultura do algodoeiro
    (Universidade Federal de Mato Grosso, 2020-02-27) Moncada, Juan Vicente Liendro; José, Jefferson Vieira; 315.083.978-56; http://lattes.cnpq.br/0180791633456689; Silva, Tonny José Araújo da; 781.203.064-49; http://lattes.cnpq.br/0651075688988405; Silva, Tonny José Araújo da; 781.203.064-49; http://lattes.cnpq.br/0651075688988405; José, Jefferson Vieira; 315.083.978-56; http://lattes.cnpq.br/0180791633456689; Fenner, William; 029.533.101-18; http://lattes.cnpq.br/2509207331637862
    Brazil is the fourth largest global producer of cotton and the second largest exporter of this fiber, in addition to having the second place in terms of productivity. In this world panorama, the State of Mato Grosso (MT) is the number one cotton producer in the country with 66,61% of the total Brazilian production. Thus, the problem of spatial and temporal estimation of water needs for cotton cultivation in extensive agricultural production areas arises. Therefore, the objective of the study was to determine the efficiency of estimation models by means of remote sensing in evapotranspiration (ETc) and crop coefficient (Kc) of cotton (Gossypium sp. L.) during the stages of the plant's phenological cycle. The research was carried out on eight cotton fields located in the upper part of the Rio das Mortes (MT) hydrographic basin using data and information accessible from the Campo Verde and Primavera do Leste meteorological stations, associated with the National Institute of Meteorology (INMET) from Brazil to determine the reference evapotranspiration (ETo) by the FAO PenmanMonteith method in the study area. The surface energy balance algorithms SEBAL (Surface Energy Balance Algorithm for Land) and METRIC (Mapping Evapotranspiration at High Resolution with Internalized Calibration) were implemented using satellite images from the Landsat 8 program. The development of the research took place in a Geographic Information Systems environment, using the capabilities of the free software QGIS 3.6.2 and GRASS 7.6.1, and the EEFlux platform (Earth Engine Evapotranspiration Flux) version 0.10.10 of the Google Earth Engine system. The algorithm estimates were compared with determinations made by the FAO 56 method, by simple differences in the case of Kc, and through statistical analysis of simple linear regression for ETc. The results of the research show that in the set of fields analyzed, the SEBAL model reached an average daily ETa close to 5,61 and 3,21 mm d-1, in the intermediate and final stages of the cotton phenological cycle, with an overall efficiency around 67%. The average Kc of the algorithm was close to 1,27 and 0,73 in the intermediate and final stages, with global performances of approximately 92 and 96% respectively. The average total water consumption was 775,43 mm. The model showed an absence of data and information in the initial phase of the cycle, due to the occurrence of the rainy season in the study area. Regarding the METRIC model, the results indicate that it reached an average daily ETa close to 4,14 (initial stage); 3,68 (development stage); 3,28 (intermediate stage) and 2,86 mm d-1 (final stage), with overall efficiency around 20%. The average Kc of the algorithm was close to 0,89 (initial phase); 0,83 (intermediate phase) and 0,62 (final phase), with overall performances of approximately 91; 73 and 100% respectively. The average of total water consumption was 567,64 mm. In general, the SEBAL model surpassed the METRIC EEFlux model in efficiency, in the ETc and Kc estimates of the cotton in the study area, when compared with the FAO 56 method.