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ZANON, Alencar Junior et al. Branches contribution and leaf area index evolution in modern cultivars of soybean. Bragantia [online]. 2015, vol.74, n.3, pp.279-290.  Epub July 21, 2015. ISSN 1678-4499.

The purposes of this study were to quantify the branches contribution and the leaf area index evolution in modern cultivars of soybean with different maturity groups, stem termination, sowing in different dates and producing regions of soybean in Rio Grande do Sul. Field experiments were conducted during the growing season 2013/2014 in Santa Maria, Júlio de Castilhos and in three soybean crops on the municipalities of Restinga Sêca, Tupanciretã and Água Santa. It were carried out analysis (occurrence date) of reproductive stages and determination total, maximum, of main stem and of branches of leaf area index in thirteen cultivars of soybean. The leaf area index on the branches contributes with about 31%, 12.3% and 11% of the total leaf area index on the determinate cultivars and with 20.2%, 11.8% and 9% of the total leaf area index on the indeterminate cultivars sowing in September, November and February, respectively, in Santa Maria. Most cultivars showed a reduction on total leaf area index, maximum, of main stem and of branches with the delay on planting date, independently of the maturity group and stem termination.

Keywords : Glycine max; sowing date; growth type.

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