To investigate the reduction of the seed soaking time, in bulk and individualy, conductivity tests were performed on four seed lots of two soybean varieties (IAC-8 and IAC-15). The following tests were conducted: standard germination, first count of standard germination, accelerated aging and seed moisture. Studies of bulk and individual (ASA-610) seed conductivity were conducted with 4, 8, 12, 16, 20 and 24 hours of soaking. It was concluded that for the bulk conductivity test the shorter imbibition periods (4 and 8) can be used for the detection of wide vigor differences, while imbibition periods of 16, 20 and 24 hours can be used to identify smaller vigor differences among soybean seed lots. This test showed to have good potential as a rapid and efficient method to discriminate soybean seed lots of different qualities. Its use in seed quality control programs can be useful. The efficiency of the ASA-610 varied according to variety.

TESTES DE CONDUTIVIDADE ELÉTRICA PARA AVALIAÇÃO DO VIGOR DE SEMENTES DE SOJA (Glycine max (L.) Merrill)

Sementes de tres cultivares de soja foram submetidas a testes de germinacao, tetrazolio, frio, envelhecimento artificial, condutividade eletrica e emergencia das plântulas em campo, nas instalacoes do Departamento de Agricultura da ESALQ/USP, entre os meses de outubro de 1987 e abril de 1988. Avaliaram-se diferentes periodos de embebicao pre-leitura da condutividade eletrica, com o objetivo principal de verificar a possibilidade da reducao da duracao desse teste. Concluiu-se que a avaliacao do potencial fisiologico das sementes em laboratorio deve ser baseada no conjunto dos resultados de diferentes testes. Dentre eles, periodos mais curtos de embebicao (4 e 8 horas) pre-leitura da condutividade podem ser utilizados para identificacao de diferencas mais acentuadas de vigor, enquanto a embebicao durante 16 ou 20 horas toma esse teste mais sensivel as diferencas do vigor de sementes de soja

https://seer.sct.embrapa.br/index.php/pab/article/download/13737/7795

Estudo comparativo de métodos para a avaliação da qualidade fisiológica de sementes de soja, com ênfase ao teste de condutividade elétrica

https://www.seedtest.org/upload/cms/user/STI13144-48.pdf

Electrical conductivity vigour test: physiological basis and use

In cool climates, early planting of bean (Phaseolis vulgaris L) is recommended to assure a longer vegetative growth period Early planting exposes seed to unfavorable conditions and the commonly used standard germination test cannot predict field emergence The objective of this work was to examine the relationships between various seed quality tests and field emergence of common bean seeds Thirty-nine strains and cultivars of bean were tested in the field and laboratory over 3 yr Each year seed samples were tested in the laboratory and then planted in the field at very early, early, and at optimal planting dates The viability of seeds was test by tetrazolium staining and was generally high; standard germination was above 80%, but germination in the cool test (at 10°C) varied from 0 to 99% The percentage of seeds with broken coats varied from 05 to 503 and conductivity ranged from 7 to 45 μS cm -1 g -1  Field emergence varied from 0 to 100% Soil temperature at sowing appeared to be not only the most important environmental factor influencing field emergence but also a factor able to be used to differentiate the field emergence potential of a seed lot Only the conductivity test could be used to predict seedling emergence in the field irrespective of soil temperature at sowing At temperatures ranging from 9 to 15°C, the first and the last count of the standard germination test and the broken seed coat test should be used in conjunction with the conductivity test to estimate field emergence potential

https://acsess.onlinelibrary.wiley.com/doi/pdf/10.2135/cropsci2000.402470x

Relationship between Laboratory Seed Quality Tests and Field Emergence of Common Bean Seed

This work was conducted to investigate the possibilities of providing rapid indications on the physiological quality of vegetable seeds through the electrical conductivity and potassium leakage test. The efficiency of the information of these tests were related to other indicators of seed vigour. Four seed lots of snap bean (Phaseolus vulgaris L.) and okra (Hibiscus esculentus L.) were submitted to germination, first count, accelerated aging, emergence in sand and seed moisture tests. In addition, studies on electrical conductivity and potassium leaching were conducted with four replications of 50 and 25 pure seeds respectively, placed into 75ml distilled water. The electrical conductivity was determined using a conductivity meter after 4, 8 12, 16, 20 and 24 hours, while the amount of leached potassium was evaluated in a flame photometer after a 60, 90, and 120 min. imbibition. It was concluded that the electrical conductivity test was efficient for vigour evaluation of the seeds. The seed lot with high vigour was identified with four hours imbibition period, while efficient discrimination among seed lots was obtained with 24 hours. With regards to the potassium leakage test, additional studies are necessary to provide a methodology adjustment for vigour evaluation of these seeds.

Condutividade elétrica e lixiviação de potássio para avaliação do vigor de sementes de hortaliças: feijão-de-vagem e quiabo 1

Evaluation of Vigor Tests in Soybean Seeds: Relationship of Accelerated Aging, Cold, Sand Bench, and Speed of Germination Test to Field Performance 1

Evaluation of Vigor Tests in Soybean Seeds: Relationship of the Standard Germination Test, Seedling Vigor Classification, Seedling Length, and Tetrazolium Staining to Field Performance1

Evaluation of Vigor Tests in Soybean Seeds: Relationship of ATP, Conductivity, and Radioactive Tracer Multiple Criteria Laboratory Tests to Field Performance 1

Martin M. Kulik

Papers

Evaluation of Vigor Tests in Soybean Seeds: Relationship of Accelerated Aging, Cold, Sand Bench, and Speed of Germination Test to Field Performance 1

Evaluation of Vigor Tests in Soybean Seeds: Relationship of the Standard Germination Test, Seedling Vigor Classification, Seedling Length, and Tetrazolium Staining to Field Performance1

Evaluation of Vigor Tests in Soybean Seeds: Relationship of ATP, Conductivity, and Radioactive Tracer Multiple Criteria Laboratory Tests to Field Performance 1