2014
DOI: 10.1590/1678-4499.0179
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Estimativa da área de folhas de cultivares antigas e modernas de soja por método não destrutivo

Abstract: The objective of this study was to determine an empirical mathematical model to estimate leaf area of different soybean cultivars from leaf dimensions, with emphasis on modern and currently used soybean cultivars in the Rio Grande do Sul State. A field experiment was conducted at Santa Maria during three growing seasons (2010/2011, 2012/2013 and 2013/2014) Estimativa da área de folhas de cultivares antigas e modernas de soja por método não destrutivoResumo O objetivo do trabalho foi determinar um modelo mat… Show more

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Cited by 58 publications
(41 citation statements)
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References 15 publications
(16 reference statements)
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“…The aim was to identify which independent variable is best correlated with LA and whether a general model can be used to determine canola LA or if it is necessary to use one model for each type of leaf. The slope was estimated by forcing the line to pass through the origin (null intercept), because it is more correct according to Richter et al (2014), since if there are no linear dimensions, there is no leaf area.…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…The aim was to identify which independent variable is best correlated with LA and whether a general model can be used to determine canola LA or if it is necessary to use one model for each type of leaf. The slope was estimated by forcing the line to pass through the origin (null intercept), because it is more correct according to Richter et al (2014), since if there are no linear dimensions, there is no leaf area.…”
Section: Methodsmentioning
confidence: 99%
“…Its application resulted in the highest RMSE among the tested models (34.7, 72.27 and 18.35 cm²), which may have occurred because the authors did not force the equation to pass through the origin (null intercept), because the model estimates a leaf area of 20.148 cm² even when the independent variable (length) is equal to zero. According to Richter et al (2014), it is important to force the linear regression to pass through the origin (null intercept), because if there are no linear dimensions, there must not be leaf area. Additionally, Chavarria et al (2011) also used leaf length (L) as independent variable.…”
Section: G Hmentioning
confidence: 99%
“…Data on soybean seed yield were reported on a 13% seed moisture basis. More details about the experiments can be found in Richter et al (2014) and Zanon et al (2015aZanon et al ( , 2015b. Daily weather data, including solar radiation, T min , T max , relative humidity, and precipitation were collected on-site or from nearby weather stations.…”
Section: Database Descriptionmentioning
confidence: 99%
“…Em Júlio de Castilhos, Tupanciretã, Restinga Sêca e Água Santa fizeram-se apenas duas avaliações de área foliar, com o objetivo identificar o IAF próximo ao início do florescimento (R1) e do início do enchimento de grãos (R5). A área foliar foi calculada a partir das equações genético-específicas, estimadas para cada cultivar por Richter et al (2014). O IAF verde foi calculado somando-se as áreas individuais de folhas e dividindo-se pela área de solo ocupada por uma planta, em mesma unidade de área.…”
Section: Materials E Métodounclassified
“…Entre as principais mudanças no sistema produtivo na região Sul do Brasil, destaca-se o aumento da utilização de cultivares de soja com tipo de crescimento indeterminado e ciclo curto (grupo de maturação entre 4,5 e 7,5) (Richter et al, 2014). Este novo grupo de cultivares começou a ser semeado no Rio Grande do Sul (RS) a partir dos anos 2000 e representou mais de 90% da área semeada com soja no RS no ano agrícola 2013(EMATER, 2014, em contraste com as cultivares de tipo determinado e ciclo médio e tardio cultivadas desde os primeiros relatos da soja no RS até o final da década de 1990 (Barni & Matznauer, 2000).…”
Section: Introductionunclassified