Efeitos de potenciais de água no solo, em diferentes estádios fenológicos da cultura da cevada (Hordeum vulgare L.)

Urchei, Mário Artemio; Rodrigues, João Domingos

doi:10.1590/s0103-90161994000300027

Cited by 6 publications

(3 citation statements)

References 7 publications

(5 reference statements)

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“…Although being used for animal feeding (grazing or rations), human consumption (flour), and therapeutical uses, that cereal is specially used for malt production in the beer industries (Urchei, 1994).…”

Section: Introductionmentioning

confidence: 99%

Viability of barley seeds by the tetrazolium test

Souza

Ohlson

Silva

et al. 2012

Rev. bras. sementes

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-The tetrazolium test is used to control seed quality of various plant species since it allows a rapid evaluation of viability. Freshly harvested barley seeds show dormancy that can make the germination test ineffective for an immediate evaluation. Therefore, the development of more efficient methods, such as the tetrazolium test, is necessary. The objective of this research work was to study various procedures for performing the tetrazolium test on barley seeds. Five lots of cv. BRS 195 barley seeds were used and subjected to the following treatments: two different methods of seed preconditioning (direct immersion in H 2 O and between sheets of moistened paper towels); two types of preparation for staining (longitudinal cross-section of the seed through the embryo with immersion of one half in a 2,3,5 triphenyl tetrazolium chloride solution or placing both halves on top of filter paper moistened with the tetrazolium salt solution); two methods of staining (on top of filter paper and direct immersion in the tetrazolium salt solution). Three concentrations of the tetrazolium salt solution (0.1%, 0.5%, and 1.0%) were used. It was concluded that the tetrazolium test on barley seeds may be accomplished with preconditioning by direct immersion in H 2 O and staining by immersing in a 0.1% or 0.5% concentration of tetrazolium salt solution or staining on top of filter paper moistened with such solution at a 1.0% concentration.Index terms: Hordeum vulgare, germination, dormancy.Viabilidade de sementes de cevada pelo teste de tetrazólio RESUMO -O teste de tetrazólio é empregado no controle da qualidade de sementes de várias espécies, pois permite estimar rapidamente a sua viabilidade. Sementes de cevada apresentam dormência quando recém-colhidas, o que pode tornar o teste de germinação ineficaz para avaliação imediata, sendo necessário o desenvolvimento de métodos mais eficientes como o de tetrazólio. O objetivo desse trabalho foi estudar vários procedimentos para a condução do teste de tetrazólio em sementes de cevada. Foram utilizados cinco lotes de sementes da cv. BRS 195, testando duas formas de pré-condicionamento da semente (imersão direta em água e entre folhas de papel toalha umedecidas); dois tipos de preparo para coloração (corte longitudinal da semente através do embrião com imersão de uma das metades em solução de cloreto de 2,3,5 trifenil tetrazólio ou com colocação das duas metades sobre papel de filtro umedecido com a solução do sal de tetrazólio); duas formas de coloração (sobre papel de filtro e com imersão direta na solução) e três concentrações de solução do sal de tetrazólio (0,1%, 0,5% e 1,0%). Foi concluído que o teste de tetrazólio em sementes de cevada pode ser conduzido mediante pré-umedecimento por imersão direta em água, coloração por imersão na solução de sal de tetrazólio nas concentrações de 0,1% e 0,5%, ou coloração sobre papel de filtro umedecido com essa solução, na concentração de 1,0%.Termos para indexação: Hordeum vulgare, germinação, dormência.

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Section: Introductionmentioning

confidence: 99%

Viability of barley seeds by the tetrazolium test

Souza

Ohlson

Silva

et al. 2012

Rev. bras. sementes

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“…The weight of 100 grains was significant for water replacement (Figure 8a), with 50% and 100% of the dry blades differ, however the highest average value was observed for 50% FR with 5,58g, not being siginificativo for variety ( Figure 8b), the weight of 100 grains obtained the highest average value with the variety BRS Aliensa, 6,53g. Urchei (1994), working with water deficits in three phenological stages of the barley, obtained the highest average weight of 100 grains (5.23 g), with the treatment they received daily irrigation during the whole cycle, and the lowest weight, 4.11 g in the treatment subjected to intense water stress throughout the cycle. Next to the values found in this work was verified by Amabile, Capettini and Faleiro (2013) to study the variety BRS 195 and BRS Savana, who obtained a weight of 100 grains of approximately 4.57 and 4.23 g, respectively.…”

Section: Resultsmentioning

confidence: 99%

Production of Barley Malteira Subjected to Different Levels of Water Replacement

Ribeiro¹,

Filho²,

Alves³

et al. 2015

Anais Do III Inovagri International Meeting - 2015

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The experiment was conducted in experimental area belonging to the Instituto Federal Goiano-Câmpus Rio Verde in the State of Goiás. Objective to evaluate the production of fresh, dry matter productivity of barley varieties malteira in winter period, subject to different levels of water replacement, under conventional sprinkler irrigation system. In each subplot experimental units were implemented with 7 rows of plants with 0.06 m spacing between plants and 0.46 m between rows and 2 feet in length, totaling 7.84 m2 of total area per sub-plot and a density of approximately 363 000 plants ha-1. Irrigation was conducted on the basis of digital tensiometria with sensitivity of 0.1 kPa, with reading recorded daily, being conducted whenever the irrigation installed tensiometers to 0.20 m reached 60 KPa, and the blade was calculated by the equation of Van Genutchen. Being the blades, 100% of the water needs of culture, 50% of the water needs of culture and nonirrigated land. The experimental design used was randomized blocks, parsed into subdivided parcel scheme 3 x 4, with three repetitions. The rated factor was the plots 3 spare water levels based on the need of water culture (0, 50 and 100% water replacement) and the subplots the 4 varieties of barley malteira, namely BRS Aliensa, BRS Itanema, BRS Manduri and BRS Sampa. The treatment that most stood out as the production of biomass and productivity was the variety BRS Itanema with 100% water replacement.

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“…Esses resultados assemelham-se aos de BARREIRO et al (2006), que, estudando o efeito de reguladores vegetais no desenvolvimento de Ocimum basilicum L., observaram máxima RAF na primeira coleta, decrescendo nos períodos seguintes. Esta tendência da RAF elevada no início do ciclo vegetativo, decrescendo, posteriormente, com a maturação da planta também foi observada por outros autores (RODRIGUES et al, 1993;URCHEI & RODRIGUES, 1994;STEFANINI et al, 1998).…”

Section: Resultsunclassified