Variação do teor de água em sementes de soja e da temperatura e umidade relativa do ar no interior das câmaras no teste de envelhecimento acelerado

Neto, Angelo Scappa; Bittencourt, Sonia Regina Mudrovitsch de; Vieira, Roberval Daiton; Volpe, Clóvis Alberto; Carvalho, N. M. de

doi:10.17801/0101-3122/rbs.v22n2p78-85

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“…After the accelerated aging, most values remained between 25.1 and 27.4%, except for lots 16 (29.1%) and 3 (31.2%). Most seed lots presented similar moisture contents, within the expected range for soybean seeds submitted to accelerated aging in germination chambers, usually varying between 25 and 30% (Bittencourt et al, 1995;Scappa Neto et al, 2000). Therefore, procedures recommended for the tests (AOSA, 1983;Hampton & TeKrony, 1995;Marcos Filho, 1999), were adequately used in this research.…”

Section: Resultsmentioning

confidence: 99%

Electrical conductivity of the seed soaking solution and soybean seedling emergence

Vieira

Neto

Bittencourt

et al. 2004

Sci. agric. (Piracicaba, Braz.)

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Vigor of soybean [Glycine max (L.) Merrill] seeds can be evaluated by measuring the electrical conductivity (EC) of the seed soaking solution, which has shown a satisfactory relationship with field seedling emergence, but has not had aproper definition of range yet. This work studies the relationship between EC and soybean seedling emergence both in the field and laboratory conditions, using twenty two seed lots. Seed water content, standard germination and vigor (EC, accelerated aging and cold tests) were evaluated under laboratory conditions using -0.03; -0.20; -0.40 and -0.60 MPa matric potentials, and field seedling emergence was also observed. There was direct relationship between EC and field seedling emergence (FE). Under laboratory conditions, a decreasing relationship was found between EC and FE as water content in the substrate decreased. Relationships between these two parameters were also found when -0.03; -0.20 and -0.40 MPa matric potentials were used. EC tests can be used successfully to evaluate soybean seed vigor and identify lots with higher or lower field emergence potential.

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Section: Resultsmentioning

confidence: 99%