Defoliation percentage in two soybean cultivars at different growth stages

Glier, Cláudio Alexandre da Silva; Júnior, José Barbosa Duarte; Fachin, Gabriel Matheus; Costa, Antônio Carlos Torres da; Guimarães, Vandeir Francisco; Mrozinski, Chrismam R.

doi:10.1590/1807-1929/agriambi.v19n6p567-573

Cited by 15 publications

(18 citation statements)

References 10 publications

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“…In these plants, the leaf area index was 67% higher than that of plants originated from low-vigor seeds. Tavares et al (2013) and Glier et al (2015) add that the leaf area of soybean plants at the moment of flowering is directly related to high assimilation of carbon dioxide, which will help to build up reserves for the further podding phase. Tavares et al (2013) also remarked that plants formed from high-vigor seeds produced more grains than those from a low-vigor origin, regardless of the soil hydric condition.…”

Section: Resultsmentioning

confidence: 99%

“…In this case, 2.0 g was added to the MTS for every 10% increase in seed vigor level. Soybean MTS is intimately related to the leaf area at the reproductive stage (Glier et al, 2015). Plants originated from high-vigor seed lots generally present a more substantial growth, forming a larger leaf area during the vegetative phase.…”

Section: Resultsmentioning

confidence: 99%

“…Another point of concern is the low uniformity of the plants, which may reduce the effectiveness of crop practices (Cantarelli et al, 2015). Soybean grain yield is assembled throughout the crop cycle, as the components directly related to productivity are formed at different phases (Dalchiavon and Carvalho, 2012;Glier et al, 2015).On top of that, the usage of seeds with high physiological quality reflects positively not only on individual plants, but on the community as a whole, as verified by Panozzo et al (2009), , Schereen et al (2010), Silva et al (2013), and Tavares et al (2013).…”

Section: Introductionmentioning

confidence: 99%

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Productive performance of soybean plants originated from seed lots with increasing vigor levels

et al. 2019

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The objective of this work was to evaluate the productive performance of soybean crops, in response to the use of seeds from lots with increasing vigor levels. The study was developed during the 2014/2015 and 2015/2016crops. In the first period, 14 treatments were evaluated, consisting of two factors, two genotypes (Syn 1059RR and NK7059RR), and seven seed lots. In the second seven treatments were considered, involving one genotype (Syn 1158RR) and seven seed lots. In both crop years, seed lots had vigor levels of 65, 70, 75, 80, 85, 90 and 95%, as determined by the accelerated aging test. The experiment was performed in a randomized block design, with a factorial scheme and five replications. Plant height, yield components, and grain yield were assessed throughout the culture cycle. The reflex of seed vigor in crop performance depended on the genotype employed. Also, there was an increase in both vegetative and reproductive performances of the crop as a function of seed vigor level. In this sense, every percentage point augmented in the vigor level of the lots resulted in a grain yield expansion of up to 28 kg.ha-1.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Productive performance of soybean plants originated from seed lots with increasing vigor levels

et al. 2019

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“…Silva et al (2003) point out that the bean's ability to recover after defoliation varies according to the development stage it is subject to damage. Glier et al (2015) observed that defoliation in V4 and R5 stages are the most harmful to the crop, occurring greater reduction in production potential. Similarly, Fontoura et al (2006) also observed that the most critical stage for leaf area loss is R5, which significantly reduces crop yield with the intensification of the plant's leaf area removal.…”

Section: Introductionmentioning

confidence: 99%

Iphimeis dives (Crysomelidae) Beetle occurrence in beans in western Parana State, Brazil

Alves¹,

Nunes²,

Costa³

et al. 2016

Afr. J. Plant Sci.

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Iphimeis dives (Germar, 1824) is a species of beetle from Chrysomelidae family, commonly found in fruit trees, and it is known as a vine defoliator beetle or Green Beetle. In this study, I. dives occurrence in bean (Phaseolus vulgaris L.) is registered in the cities of Assis Chateaubriand and Palotina, western region of Paraná State. This is the first recorded I. dives attack in Brazil's bean crops. The insects were collected when plants w ere betw een the phenological d e v e l o p m e n t s t a g e s V4 /R 5. Although commonly found in fruit trees and some vegetables, this record in bean crop suggests greater attention to this insect because of the damage it may cause in this culture.

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“…Some varieties when harvested more than 12 months after planting, do not provide economic gains and their roots can easily deteriorate in the field. Abiotic factors, such as phytotoxicity of pesticides or fertilizers, sleet, and certain mechanical injuries and biotic factors such as some diseases and pests, are events of common occurrence in cultivation areas, which may cause losses of leaf area in these cultured plants (Fazolin & Estrela, 2003;Glier et al, 2015). Depending on the level of defoliation, i.e., the intensity and time of plant development, significant defoliation may reduce the photosynthetic potential and productivity (Silva et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Levels and times of artificial defoliation on performance of second cycle cassava

et al. 2019

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The information on behavior of crop linked to defoliation is essential to determine the management of herbivore pests. The aim of this study was to evaluate the performance of cassava as a function of the time and level of defoliation applied in the second cycle of cultivation, that is, after the first year of cultivation in which the crop was naturally submitted to the physiological rest period, caused by low temperatures and pluviometric precipitation typical of the southern Brazilian region. We used a randomized block design in factorial 5 x 5.in which 5 levels of defoliation (0, 25, 50, 75 or 100% of defoliation) were applied at 5 different times of 45, 90, 135, 180, or 225 days after sprouting (DAS) of the stems. The following variables were measured: plant height, stem diameter, number of roots per plant, root mass and amount of starch in the roots. The means were submitted to the F test at 5% of probability and analyzed by the regression test using the Sisvar software. Plant height and diameter were inversely proportional to the degree of defoliation when subjected to treatments, especially when subjected to 100% defoliation at 90 DAS. For the root mass, the more drastic defoliation treatments (100 %), when applied at 132 DAS, led to a low production, whereas only the defoliation levels induced a meaningful reduction in the deposition of starch in roots, showing a linear effect and decreasing according to the increase in defoliation. It can be concluded that defoliation between 90 and 135 DAS at the more drastic levels resulted in a greater root mass loss, regardless of the time of defoliation, caused the greatest losses in the amount of starch, therefore, it is recommended to the producer to control this pest before the 90 days of sprouting of the stems at the beginning of the defoliation.

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Defoliation percentage in two soybean cultivars at different growth stages

Cited by 15 publications

References 10 publications

Productive performance of soybean plants originated from seed lots with increasing vigor levels

Productive performance of soybean plants originated from seed lots with increasing vigor levels

Iphimeis dives (Crysomelidae) Beetle occurrence in beans in western Parana State, Brazil

Levels and times of artificial defoliation on performance of second cycle cassava

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