L
Título: Efficiency of the leaf disc method for estimating the leaf area index of soybean plants - doi: 10.4025/actasciagron.v35i4.16290
Autores: Pierozan Junior, Clovis; Escola Superior de Agricultura "Luiz de Queiroz"
Kawakami, Jackson; Universidade Estadual do Centro-Oeste
Fecha: 2013-09-19
Publicador: Universidade Estadual de Maringá
Fuente: Ver documento
Tipo:
Pesquisa Empírica de Campo

Tema: Ciências Agrárias; Agronomia;
Glycine max; cultivars; digital photos; growth stages; sowing dates
Fitotecnia;
Descripción: The objective of this study was to evaluate the efficiency of the leaf disc method for estimating the leaf area index (LAI) of soybean plants in comparison with the digital photo method. A split-plot experimental design was used with three replications. The LAIs calculated by the leaf disc and digital photo methods were compared at four growth stages in four soybean cultivars (subplot). These soybean cultivars were sowed in Guarapuava, Paraná State, Brazil, at three different sowing dates (main plot) in the 2010/2011 growing season. Regression analysis was used for each group of samples, and the efficiency of the leaf disc method was evaluated on the basis of the coefficient of determination (R²), the calculated F and the intersection and abscissa errors. The regression analysis that compared the two methods resulted in highly significant F values and low errors for all sample groups, which showed the effectiveness of the leaf disc method. Although the R2 value was high for all of the analyses, the values were minor for the separate growth stage analysis, especially for the samples collected at the V9 and R2 stages. The results indicated that the specific leaf area calculated by the leaf disc method was lesser to the specific leaf area calculated by the digital photo method. The leaf disc method is an efficient and robust method for estimating the LAI of soybean plants.  
Idioma: Inglés
Artículos similares:
Potencial de Chrysoperla externa (Hagen) no controle de Bemisia tabaci (Gennadius) biótipo B em tomateiro - DOI: 10.4025/actasciagron.v29i1.62,Potential of Chrysoperla externa (Hagen) at B-biotype Bemisia tabaci (Gennadius) nymphs control in tomato plants - DOI: 10.4025/actasciagron.v29i1.62 por Auad, Alexander Machado; EMBRAPA Gado Leite,Carvalho, César Freire; UFLA,Souza, Brígida; UFLA,Simões, Amanda Daniela; CESJF,Oliveira, Simone Alves; UFLA,Braga, André Luiz Furtado; CESJF,Ferreira, Roberta Botelho; CESJF
Silício e fósforo em diferentes solos cultivados com arroz de sequeiro - DOI: 10.4025/actasciagron.v29i1.58,Silicon and phosphorus in soils cultivated with upland rice - DOI: 10.4025/actasciagron.v29i1.58 por Tokura, Alessandra Mayumi; Uniderp,Furtini Neto, Antonio Eduardo; UFLA,Curi, Nilton; UFLA,Carneiro, Leandro Flávio; UFLA,Alovisi, Alves Alexandre; SNP Contultoria
Tomate longa vida desidratado em diferentes temperaturas de secagem - DOI: 10.4025/actasciagron.v29i1.63,Drying of tomato at different temperatures - DOI: 10.4025/actasciagron.v29i1.63 por Raupp, Dorivaldo da Silva; UEPG,Gabriel, Luciana Sutil; UEPG,Vezzaro, Alex Fabiano; UEPG,Daros, Pâmela Ávila; UEPG,Chrestani, Francielli; UEPG,Gardingo, José Raulindo; UEPG,Borsato, Aurélio Vinicius; UFPR
Culturas antecessoras, doses e fontes de nitrogênio nos componentes de produção do milho - DOI: 10.4025/actasciagron.v29i1.66,Antecedent crops, doses and sources of nitrogen on yield compounds of corn - DOI: 10.4025/actasciagron.v29i1.66 por Lourente, Elaine Reis Pinheiro; UFMS,Ontocelli, Rogério,Souza, Luiz Carlos Feirreira de; UFMS,Gonçalves, Manuel Carlos; UFMS,Marchetti, Marlene Estevão; UFMS,Rodrigues, Edson Talarico; UFMS
Relacionamento entre tamanho do nódulo e medições convencionais da nodulação - DOI: 10.4025/actasciagron.v29i1.65,Relationship between nodule size and conventional nodulation measurements - DOI: 10.4025/actasciagron.v29i1.65 por Costa, José Valdemir Tenório da; UFRPE,Lira Júnior, Mario de Andrade; UFRPE,Ferreira, Rinaldo Luiz Caraciolo; UFRPE,Stamford, Newton Pereira; UFRPE,Campanharo, Marcela; UFRPE,Sousa, Clayton Albuquerque de; UFRPE
Avaliação do crescimento micelial de linhagens de shiitake, da produção em toras de eucalipto e de alterações físicas da madeira - DOI: 10.4025/actasciagron.v29i1.61,Evaluation of mycelium growth of shiitake strains, of production in Eucalyptus logs and of physical alteration of the wood - DOI: 10.4025/actasciagron.v29i1.61 por Andrade, Meire Cristina Nogueira de; Unesp/Botucatu,Calonego, Fred Willians; Unesp Botucatu,Minhoni, Marli Teixeira de Almeida; Unesp Botucatu,Severo, Elias Taylor Durgante; Unesp Botucatu,Kopytowski Filho, João; Unesp Botucatu
10 
Desempenho do arroz irrigado em resposta à utilização de cianobactérias fixadoras de nitrogênio - DOI: 10.4025/actasciagron.v29i1.67,Performance of paddy rice in response to the use of nitrogen-fixing cyanobacteria - DOI: 10.4025/actasciagron.v29i1.67 por Marchesan, Enio; UFSM,Santos, Fernando Machado dos; UFSM,Avila, Luis Antonio de; UFSM,Camargo, Edinalvo Rabaioli; UFSM,Martin, Thomas Newton; ESALQ,Brenzoni, Edgardo Oscar; Rizobacter Argentina