Leaf area estimation of medium size plants using optical metrology

Ribeiro, Kleber Mariano; Braga, Roberto A.; Scalco, Myriane Stella; Horgan, Graham

doi:10.1590/s1415-43662013000600004

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…The potential of application of unwarping in agriculture is great, since the inference on information related to crops can be performed through optical biometry. Studies on the measurement of leaf area are typical examples of this potential (Marcon et al, 2011;Silva et al, 2011;Ribeiro et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Measurement of volume of macaw palm fruit using traditional and the digital Moiré techniques

Costa

Ribeiro

Braga

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe macaw palm crop has been studied because of its bioenergy potential due to the high oil yield, which is linked to fruit maturity stage. Digital images have been adopted as a contactless way to obtain information about fruit surface area and volume, acting as a sensor for quality control and the classification of fruits, based on physical aspects during the maturation stage. The aim of this study was to estimate the volume of macaw palm fruits from digital models obtained by the Moiré technique using only one camera, associated with digital imageprocessing tools to unwarp the images, allowing the comparison with conventional methods. The volumes obtained by the Moiré technique were compared with those obtained by water displacement method (WDM) and millet-seed displacement method (SDM). The results show that the volumes measured by the Moiré technique exhibited a mean error of 13.54% compared with the SDM, and 11.09% when compared to WDM, which indicates that the digital Moiré technique is a robust, low-cost tool to measure the volume of macaw palm fruits.Mensuração do volume do fruto de macaúba por meio das técnicas convencionais e pela técnica digital de Moiré R E S U M OA cultura da macaúba vem sendo estudada devido ao seu potencial bioenergético propiciado pela alta produtividade de óleo que, por sua vez, está associado ao estádio de maturação do fruto. Imagens digitais têm sido utilizadas como forma para extrair informações sem contato sobre a área superficial e volume de frutos, com a finalidade de construir sensores que possam atuar no controle de qualidade e classificação a partir de aspectos físicos ligados ao estádio de maturação. O objetivo deste trabalho foi estimar o volume do fruto de macaúba a partir de imagens digitais obtidas pela técnica de Moiré por meio de uma única câmera associada ao uso de técnicas de correção digital da deformação das imagens, comparando os volumes estimados por métodos convencionais. Os volumes obtidos pela técnica de Moiré foram comparados com os volumes obtidos pelo método de deslocamento de coluna de água e pelo método do deslocamento de sementes de painço. Os volumes medidos pela técnica de Moiré apresentam um erro médio de 13,54 e de 11,09% quando comparados aos métodos convencionais, sendo considerada uma alternativa robusta e de baixo custo para a mensuração do volume de frutos de macaúba.

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Section: Introductionmentioning

confidence: 99%

Measurement of volume of macaw palm fruit using traditional and the digital Moiré techniques

Costa

Ribeiro

Braga

et al. 2016

Rev. bras. eng. agríc. ambient.

Self Cite

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“…Both models presented high R 2 (above 0.83), but for 2-year old and 3-year old the model underpredict and overpredict estimated LAI, respectively. Using many different indirect methods of determining LAI in medium size coffee trees (1.6 m height), Ribeiro et al (2013) observed that LAI-2000 presented a cubic model with low R 2 (0.3023). Although the authors used the same measurement methodology presented in our study (isolate plant measurement), they mention that using LAI-2000 for medium size coffee trees is a non-fitted instrument due it provides useful LAI estimation.…”

Section: Resultsmentioning

confidence: 99%

Crop evapotranspiration and crop coefficient of jatropha from first to fourth year

Lena¹

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Water requirements from crops in an important information to manage irrigation. Jatropha (Jatropha curcas L.) actual crop evapotranspiration (ETc) and crop coefficient (Kc) is still unknown, which is necessary to understand the plant water demand dynamic, as well as to stablish strategies to improve irrigation efficiency. The objective of this study was to determine jatropha ETc and Kc from 1 st to 4 th growing year. The experiment was performed from March 2012 to August 2015 at "Luiz de Queiroz" College of Agriculture (ESALQ)/University of São Paulo (USP), Brazil. The experiment was divided into center pivot, drip, and rainfed treatments. Two large weighing lysimeters (12 m 2 surface area) were used per treatment to perform jatropha ETc determination (one plant per lysimeter). Reference evapotranspiration (ET0) was determined by grass based Penman-Monteith method using data from a weather station located close to the experiment. Kc was determined for the irrigated treatments by the ration between ETc and ET0 (Kc=ETc/ET0). For all years analyzed, ETc values ranged from 0.7 to 8 mm d-1 for center pivot treatment, from 0.6 to 7.4 mm d-1 for drip treatment, and from 0.4 to 5.4 mm d-1 for rainfed treatment. It was observed higher values for irrigated treatments in comparison to rainfed treatment, which was explained by the higher soil water availability provided by irrigation. In the 1 st year, Kc was 0.47 for both treatments, varying from 0.4 to 0.9. In the 2 nd , 3 rd , and 4 th year, Kc ranged from 0.15 to 1.38 for center pivot treatment and from 0.15 to 1.25 for drip treatment. Kc average for 2 nd , 3 rd , and 4 th during vegetative and productive growing stages together was 0.77, 0.93, and 0.82 for center pivot treatment, respectively, and 0.69, 0.79, and 0.74 for drip treatment, respectively. The reason Kc for center pivot treatment was slightly higher than drip treatment was due the high soil moisture after irrigation event, increasing soil evaporation rates. Annual ETc and Kc fluctuation in 2 nd , 3 rd , and 4 th years was very similar, which was explained by the growing stage and the leaf area index dynamic during the year, presenting values varying from 0 to 0.5 in the 1 st year, from 0 to 1.4 in the 3 rd year, and from 0 to 2 in the 3 rd year. The comparison between Kc and leaf area index showed, for center pivot treatment, a logarithmical equation with coefficient of determination (R 2) and root mean square error (RMSE) of 0.7877 and 0.3831, respectively, and 0.8655 and 0.1419 for drip treatment, respectively. For all three years analyzed, Kc related to cumulative thermal unit showed a 3 rd degree polynomial equation for both treatments, with R 2 ranging from 0.3373 to 0.6297 in the center pivot treatment and from 0.5445 to 0.6386 in the drip treatment.

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“…El área de la hoja (AH) y el número de hojas (NH) son características importantes ya que se encuentran asociadas a la captación de luz, al intercambio gaseoso y por ende a la formación de biomasa de la planta (Weraduwage et al, 2015). El AH es tan importante que diversos investigadores han dedicado esfuerzos para poder calcularla en el menor tiempo posible y a bajo costo (Ribeiro et al, 2013;Carvalho et al, 2017). Algunas investigaciones señalan que el Cd +2 puede reducir el AH como consecuencia de su fitotoxicidad (Rehman et al, 2011), en este sentido es importante indicar que este elemento se encuentra asociado a algunos daños a nivel del DNA como a la ruptura de la membrana celular (Anjum et al, 2015;Huybrechts et al, 2019).…”

Section: Resultados Y Discusiónunclassified

ABSORCIÓN DIFERENCIADA DE CADMIO Y SU EFECTO EN LA FISIOLOGÍA DE SEIS GENOTIPOS DE CACAO (Theobroma cacao L.) EN SAN RAMÓN, SELVA CENTRAL DEL PERÚ

Borjas‐Ventura¹,

Bello-Medina²,

Bello-Amez³

et al. 2022

Trop Subtrop Agroecosyst

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Background. Cacao is an important source of income, especially for small farmers in developing countries. However, its commercialization, and consequently its production, is threatened by the high levels of cadmium (Cd+2) in grains. Objective. This work was carried out with the objective of determining the differentiated uptake of six cacao genotypes in San Ramón, central Peruvian jungle. Methodology. The treatments consisted of the combination of different doses Cd+2 (0, 50, 100 and 150 ppm) with the genotypes CCN-51, ICS-60, ICS-95, POUND-7 and VRAE-99. Results. The results indicate that POUND 7 absorbed a greater amount of Cd+2 concentrated mainly in the root, while CCN-51 concentrated it mainly in the aerial tissues. In VRAE-99, a significant drop in stem height and diameter was observed, especially at the 150 ppm dose. This genotype was shown to be more sensitive to this metal at high doses (150 ppm) and decreased its photosynthetic rate and its efficiency in the use of water, which was confirmed by the increase in the internal carbon content. Implications. In general, it was found that POUND-7 is a promising genotype that can potentially be used as a rootstock because it is capable of accumulating Cd+2 mainly in the roots. Conclusion. Although cacao is considered a Cd+2 accumulator plant, this heavy metal can negatively affect the physiology of the plant as in the case of VRAE-99. Further studies are suggested to better understand how Cd+2 affects cacao physiology.

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Leaf area estimation of medium size plants using optical metrology

Cited by 5 publications

References 19 publications

Measurement of volume of macaw palm fruit using traditional and the digital Moiré techniques

Measurement of volume of macaw palm fruit using traditional and the digital Moiré techniques

Crop evapotranspiration and crop coefficient of jatropha from first to fourth year

ABSORCIÓN DIFERENCIADA DE CADMIO Y SU EFECTO EN LA FISIOLOGÍA DE SEIS GENOTIPOS DE CACAO (Theobroma cacao L.) EN SAN RAMÓN, SELVA CENTRAL DEL PERÚ

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