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MIYASAKA, Shiro et al. Soybean varieties insensible to photoperiodism and tolerant to low temperatures. Bragantia [online]. 1970, vol.29, n.unico, pp.169-173. ISSN 0006-8705.

In a preliminary trial conducted at Campinas, during the winter of 1957, it was found that a few soybean varieties could grow and produce grains and hay relatively well during that time of the year. During the winter of 1958, a trial including 12 varieties selected according to the informations obtained in 1957, was conducted at Pindamonhangaba (Vale do Paraíba - SP) in irrigated fields. The cultivar "Aliança Preta-1" produced 1.700 kg/ha of grains and had a life cycle of 120 days. The cultivar "Santa-Maria-1" flowered irregularly 90-120 days after emergence, produced 22 ton/ha of mass and was 0,82 m tall. This behavior was unexpected and the cultivar "Santa Maria-1" is apparently insensible to the short days which induce early flowering.

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