Determinação do estádio de dessecação em soja de hábito de crescimento indeterminado no Mato Grosso

Inoue, Miriam Hiroko; Pereira, Pedro Silvério Xavier; Mendes, Kássio Ferreira; Ben, Ronei; Dallacort, Rivanildo; Mainardi, J. T.; Araújo, Dejânia Vieira de; Conciani, Paulo Alberto

doi:10.7824/rbh.v11i1.137

Cited by 6 publications

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“…Isto demonstra que a partir do estádio R7.1 (maturidade fisiológica) as sementes já acumularam quantidades consideráveis de matéria seca assegurando que a produtividade de sementes não seja alterada negativamente. Inoue et al (2012), encontraram resultados com este mesmo comportamento aplicando dessecantes a partir do estádio R7.5 (após a maturidade fisiológica). Porém, Daltro et al (2010) e Guimarães et al (2012), verificaram que o uso da dessecação química mesmo antes da maturidade fisiológica (estádios de desenvolvimento R6.0 ou R6.5) com o uso dos dessecantes paraquat ou diquat e paraquat e glufosinato de amônio também não afetam a produtividade da soja.…”

Section: Resultsunclassified

“…Estes resultados foram similares aos encontrados por Inoue et al (2012) os quais observaram redução da massa de 100 sementes com o uso da dessecação pré-colheita com diquat no estágio R6.5 e R7.0 quando comparado ao estádio R7.5 para a cultivar SYN 9074 RR. Em contrapartida, Pelúzio et al (2008) não encontrou diferenças entre a massa de 100 sementes com a aplicação de paraquat nos estádios R6.0, R7.0 e R8.0 para a cultura da soja.…”

Section: Resultsunclassified

“…Este processo de absorção e perda de água diária pela semente pode acelerar a deterioração e consequentemente a perda de germinação e vigor das sementes (PESKE; LUCCA BARROS, 2006). O atraso da colheita é um dos principais fatores de redução da qualidade de sementes de soja a campo, este fato foi relatado por Inoue et al (2012) que ao analisar diferentes áreas com aplicação de dessecantes pré-colheita evidenciaram que sementes oriundas de plantas não dessecadas apresentaram menor percentual de germinação, devido ao atraso da colheita.…”

Section: Testemunhaunclassified

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Dessecação química para antecipação de colheita em cultivares de soja

et al. 2015

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ResumoO uso de dessecantes é uma alternativa para antecipar a colheita de soja e manter a qualidade fisiológica das sementes. O objetivo deste trabalho foi avaliar o desempenho produtivo e a germinação de sementes em resposta a diferentes épocas e produtos químicos para dessecação e antecipação da colheita de cultivares de soja. O experimento foi conduzido em Campos Novos, em duas safras agrícolas sob o delineamento em blocos casualizados, dispostos em parcelas sub-subdivididas. Na parcela foram testados dois estádios fenológicos de aplicação (R7.1 e R7.3), nas subparcelas cinco cultivares de soja (NA 5909 RG, CD 2585 RR, BMX Turbo RR, SYN 1059 RR e BENSO 1RR e na sub-subparcela foram aplicados três dessecantes (glufosinato de amônio, paraquat e carfentrazone na safra 2011/12) e uma testemunha. Na safra 2012/13 o carfentrazone foi substituído pelo diquat. Foi avaliado o número de dias de antecipação da colheita, a produtividade de sementes, o número de vagens por planta, o número de sementes por vagem, a massa de 100 sementes e a germinação. A dessecação química com o uso de glufosinato de amônio e paraquat aplicados no estádio R7.1 permitiu antecipar a colheita em seis dias (safra 2011/12) e proporcionou a manutenção do percentual de germinação (90% e 92%) em comparação a testemunha (76%). A dessecação não influenciou negativamente a produtividade de sementes, mas reduziu a massa de sementes nas duas safras agrícolas, e a antecipação da colheita foi dependente da ausência de chuva na pré-colheita. Os dessecantes podem ser usados na antecipação de colheita em campos de produção de sementes de soja. Palavras-chave: Glicine max, maturidade fisiológica, herbicida, germinação AbstractThe use of desiccants is an alternative to anticipate the soybean harvest and keep the physiological quality of seed. The objective of this work was to assess the production performance and germination seeds in response to differents stages and desiccation chemicals products to early harvest of soybean cultivars. The experiment was conducted in Campos Novos, in two harvests, it was used a randomized complete block design disposed in split-split-plots. Two phonological stages of application (stage R7.1 and R7.3) were tested in the main plot. Five soybean cultivars (NA 5909 RG, CD 2585 RR, BMX Turbo RR, SYN 1059 RR and BENSO 1RR were evaluated in the subplots, and three desiccants ammonium glufosinate, paraquat, carfentrazone-ethyl in the 2011/12 season and one control (without the desiccant application) were evaluated in the sub-subplots. In the 2012/13 season the carfentrazone-ethyl was 1 Eng a Agr a , Drª em Produção Vegetal,

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Dessecação química para antecipação de colheita em cultivares de soja

et al. 2015

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“…Desiccant application time is crucial, because when desiccation is performed before physiological seed maturity, it may result in reduction of the crop yield (Bastidas et al, 1971;Kappes et al, 2008;Guimarães et al, 2012;Lamego et al, 2013). However, if the desiccation is appropriately performed at physiological maturity there will be uniformity in plant maturity and harvest anticipation, with no effect on the productive potential (Lacerda et al, 2001;Inoue et al, 2012;Guimarães et al, 2012). Reductions in seed yield found in this study were 27% with desiccation at R5.7, 20% with desiccation at R6.5, and 6% with desiccation at R7.3, compared to harvest at stage R8 (Table 1).…”

Section: Discussionmentioning

confidence: 99%

Productivity and quality of soybean seeds of determinate and indeterminate growth types desiccated in pre-harvest

Bezerra¹,

Sediyama²,

Cruz³

et al. 2016

Aust J Crop Sci

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Desiccation aims to control weeds and cause crop defoliation. The procedure facilitates the work of harvesters, allows earlier harvesting and standardization, and can reduce losses. The objective of this study was to evaluate the effect of pre-harvest desiccation on cycle time, seed yield and seed physiological quality of soybean cultivars of determinate and indeterminate growth types. The determinate and indeterminate cultivars 'BRS Valiosa' RR and 'MSoy 7211' RR were used for experiment. Three desiccation stages: R5.7, R6.5, R7.3 and a control treatment (R8) were tested in a 2×4 factorial scheme, with four replications. The cycle, seed water content, yield (kg ha -1 ), 100-seed weight, protein content, proportion of seeds per sieve (6.0, 5.5, 5.0 and 4.0mm); greenish, defective and normal seed percentages; and the physiological qualities of the seeds were evaluated. There was interaction between cultivar and desiccation stage for 100-seed weight, seed oil content and germination. In relation to the main factors, cultivars and stage of desiccation, only the 5.5 mm sieve fraction was not significant. Early desiccation at the R5.7 and R6.5 stages reduced yield by up to 27%. It was possible to advance the harvest of 'MSoy 7211' by up to 11 days without yield loss. Germination, however, was not affected by stage of desiccation. Desiccation at the R7.3 stage did not reduce the yield, strength or germination in either cultivar.

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“…Using the herbicide diquat in soybeans, Inoue et al (2012) showed greater root length in desiccation of plants that had higher number of yellow pods, that is, in later applications. Daltro et al (2010) and Toledo et al (2012) found that the use of glyphosate in desiccation causes phytotoxic effects and lower development of soybean seedling roots.…”

Section: (A) (B)mentioning

confidence: 99%

Physiological Quality of Carioca Bean Seeds Submitted to the Application of Desiccant Herbicides in Two Periods

et al. 2019

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The use of herbicides for bean crop desiccation aiming seed production, is an alternative management because it allows harvesting when the seeds present high vigor, germination and dry mass, however this technique can cause damages to the seeds. The objective of this study was to evaluate the physiological quality of bean seeds, of the Carioca type, with the application of desiccant herbicides doses at different periods, aiming at the anticipation of the harvest. The bean plants, Pérola cultivar, were desiccated when the seeds had 42 and 30% water content, with ammonium glufosinate, saflufenacil and diquat at doses of 0, 50, 75 and 100% in relation to the recommended average dose for desiccation, respectively for each of the herbicides. The control treatment without desiccant application was harvested on the same date as desiccation. The additional treatment, also without desiccant application, was harvested only when the seeds had a water content of 18%. The variables analyzed were germination, first germination count, germination speed index, cold test, accelerated aging, seedling and radicle length, and dry mass. The herbicides applied in the first period (42% water), at the highest doses, impair the physiological quality of the seeds, and the seeds with water contents of 30 and 42%, without the use of desiccants, promote high vigor and germination. Satisfactory results were obtained when the saflufenacil herbicide was applied in period 2 (30% water), using 50% of the recommended average dose of this herbicide.

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Determinação do estádio de dessecação em soja de hábito de crescimento indeterminado no Mato Grosso

Cited by 6 publications

References 6 publications

Dessecação química para antecipação de colheita em cultivares de soja

Dessecação química para antecipação de colheita em cultivares de soja

Productivity and quality of soybean seeds of determinate and indeterminate growth types desiccated in pre-harvest

Physiological Quality of Carioca Bean Seeds Submitted to the Application of Desiccant Herbicides in Two Periods

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