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Estimation of leaf area index in the sunflower as a function of thermal time1 Rev. Ciênc. Agron.
Lucas,Dioneia Daiane Pitol; Heldwein,Arno Bernardo; Hinnah,Fernando Dill; Maldaner,Ivan Carlos; Loose,Luis Henrique.
The aim of this study was to obtain a mathematical model for estimating the leaf area index (LAI) of a sunflower crop as a function of accumulated thermal time. Generating the models and testing their coefficients was carried out using data obtained from experiments carried out for different sowing dates in the crop years of 2007/08, 2008/09, 2009/10 and 2010/11 with two sunflower hybrids, Aguará 03 and Hélio 358. Linear leaf dimensions were used for the non-destructive measurement of the leaf area, and thermal time was used to quantify the biological time. With the data for accumulated thermal time (TTa) and LAI known for any one day after emergence, mathematical models were generated for estimating the LAI. The following models were obtained, as they...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Helianthus annuus; Leaf analysis; Modelling.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000200404
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