A B S T R A C TThe technique of controlled hydration of seeds has been used as a method of physiological conditioning to improve their performance in the field. Solution aeration with ozone gas is a promising option in controlling phytopathogens. The objective of the present study was to evaluate the physiological and sanitary quality of maize seeds preconditioned in ozonated water. In the evaluation of the physiological and sanitary quality, maize seeds were submitted to four concentrations of ozone gas (0, 10, 20 and 30 mg L -1 ) for five soaking periods (0, 30, 60, 90 and 120 min), with four replicates. Preconditioning maize seeds in ozonated water, followed by natural drying, resulted in a more pronounced initial development of seedlings, measured by means of the emergence speed index, seedling dry matter, seedling length and radicle length, compared with untreated seeds. The initial development of maize seedlings was intensified by the exposure of seeds to water, especially at 0 and 30 mg L -1 ozone concentrations during the period from 60 to 90 min. Preconditioning maize seeds in ozonated water did not affect the control of Fusarium sp. The fungicide Carbendazim + Thiram resulted in 100% control of Fusarium sp. in the seeds.Qualidade fisiológica e sanitária de sementes de milho pré-condicionadas em água ozonizada R E S U M O A técnica de hidratação controlada das sementes vem sendo utilizada como método de condicionamento fisiológico, objetivando melhorar o seu desempenho no campo. A aeração da solução com gás ozônio constitui opção promissora no controle de fitopatógenos. O objetivo do presente trabalho foi estudar a qualidade fisiológica e sanitária de sementes de milho pré-condicionada em água ozonizada. Na avaliação da qualidade fisiológica e sanitária, as sementes de milho foram submetidas a quatro concentrações de gás ozônio (0, 10, 20 e 30 mg L -1 ) em cinco períodos de embebição (0, 30, 60, 90 e 120 min), com quatro repetições. A técnica de pré-condicionamento das sementes de milho em água ozonizada, seguida de secagem natural, acarretou desenvolvimento inicial mais acentuado das plântulas de milho, avaliado por meio do índice de velocidade de emergência, matéria seca de plântulas, comprimento de plântula e radícula, quando comparadas com as sementes não tratadas. O desenvolvimento inicial das plântulas de milho foi intensificado mediante exposição das sementes à água, especialmente nas concentrações de 0 e 30 mg L -1 de ozônio, durante o período de 60 a 90 min. O pré-condicionamento das sementes de milho em água ozonizada não afetou o controle de Fusarium sp. O fungicida carbendazim+thiram resultou em 100% de controle de Fusarium sp. nas sementes.
Sweet corn is a vegetable that belongs to the special corn category. It is used exclusively in human food and differs from common green corn because it contains higher sugar content and lower starch content in its grains. The low availability of cultivars with desirable agronomic characteristics has been an obstacle to the expansion of the crop production in the country. Sweet corn seeds have germination problems and low vigor, which makes it difficult to establish the culture in the field. Hydropriming is a technique of physiological conditioning of seeds that consists of soaking seeds in water for certain periods of time, being a low-cost treatment that has shown to be very promising in the invigoration of low vigor seeds. The present work aimed to evaluate the effects of hydropriming in different aeration treatments and soaking periods on the physiological quality of crystal sweet corn seeds. The parameters of germination, seedling and radicle length, seedling dry matter and electrical conductivity were evaluated in view of the effects of aeration treatments by atmospheric air, concentrated oxygen, without aeration at different imbibition periods of 30, 60, 90 and 120 minutes, as well as the interactions between these treatments. According to the results obtained, the hydropriming treatment interacting with the atmospheric air aeration treatment provided an invigoration of the physiological quality of crystal sweet corn seeds.
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