Resposta da cultura da soja a diferentes intensidades de injúria nos estágios iniciais de desenvolvimento

Moscardi, F.; Bueno, Adeney de Freitas; Bueno, Regiane Cristina Oliveira de Freitas; Garcia, A. R.

doi:10.1590/s0103-84782012000300001

Cited by 11 publications

(7 citation statements)

References 22 publications

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“…A partially defoliated crop yielded 92% of the control, and a fully defoliated crop yielded 75% of the control when averaged across the five site-years. (Teigen and Vorst, 1975;Hintz et al, 1991;Moscardi et al, 2012) and chickpea (Cicer arietinum L.) (Li et al, 2010). Canola recovery was more variable with partial than full defoliation, with yield ranging from 77 to 97% of uncut yield for partial defoliation and 68 to 81% for full defoliation.…”

Section: Resultsmentioning

confidence: 99%

“…Complete or near-complete yield compensation has been previously reported for partially defoliated soybean [Glycine max (L.) Merr.] (Teigen and Vorst, 1975;Hintz et al, 1991;Moscardi et al, 2012) and chickpea (Cicer arietinum L.) (Li et al, 2010). Defoliated canola crops may compensate for lost leaf area by capitalizing on greater light penetration through the canopy (Iqbal et al, 2012), maintaining a high photosynthetic rate in older leaves, increasing new leaf area establishment per gram of available biomass, and by drawing on carbohydrate reserves from stems and roots to support new growth (McCormick et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

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Yield Response to Early Defoliation in Spring‐Planted Canola

Syrovy

Shirtliffe

Zarnstorff³

2016

Crop Science

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Canola (Brassica napus L.) is a high‐value summer annual crop grown in the northern Great Plains of Canada and the United States. During the early stages of its life, the crop may lose leaf area as a result of spring hail storms, frost, herbicides, animal grazing, and insects. However, little information is available on the effect of defoliation during vegetative growth on yield for spring‐planted canola. To address this gap, a five site‐year study was conducted in central Saskatchewan, Canada, to test canola recovery from partial (50%) or full (100%) defoliation at five stages before flowering (2‐, 4‐, 6‐, 8‐, and 10‐leaf stages). Partially defoliated canola plots yielded, on average, 92% of untreated control plots, while fully defoliated canola yielded 75% of controls. The yield response to defoliation timings varied; in one site‐year yield loss was minimized with earlier timings, while in the remaining site‐years, seed yield response was inconsistent or unrelated to timing. Our study shows that partial or full defoliation of summer‐cropped canola at any point during vegetative growth is likely to cause a yield loss. However the crop's substantial compensation for loss of foliage means that reseeding is rarely profitable.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Yield Response to Early Defoliation in Spring‐Planted Canola

Syrovy

Shirtliffe

Zarnstorff³

2016

Crop Science

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“…In this respect, the plants that were cut in the vegetative stages (40 and 50 DAE), have a good time for recovery, increasing the production of photoassimilates and shifting a higher percentage to the drains (grains). Thus, cutting when carried out in the vegetative stages is a stimulating factor for soybean plants (Moscardi et al, 2012;Viana et al, 2018). Therefore, this crop has a high recovery capacity and the reduction in productivity occurred only when the abiotic stress was severe enough to reduce the number of plants in the stand, since soybean plants cut in the early stages of development and associated with Stimulate ® produce as much as those that have not received cuts, thus demonstrating the e ciency of Stimulate ® and the cutting alternative.…”

Section: Discussionmentioning

confidence: 99%

Does the use of phytostimulants and the cutting times influence the productivity of the soybean crop?

Viana,

de Oliveira,

Gonçalves

et al. 2023

Preprint

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The use of techniques and products that maximize the production of a crop is fundamental when considering the scarcity of areas in regions that have adequate edaphoclimatic conditions for production or climatic inconsistency in other regions. Thus, the growth of national soybean production is due to research related to the theme; however, more studies can contribute to a greater productive advance in this segment. With this, the objective was to observe the influence of cutting times and the phytostimulant on the productivity of the soybean crop. Studies developed were in two agricultural years 2014/15 and 2015/16. The plot design was used, where the plots were formed by the cutting periods (40, 50, 60, 70 and 90 days after emergence (DAE) [1]and the subplots by the application of the phytostimulant (auxin, cytokinin and gibberellin), plus the witness without cutting. The Stimulate® positively (statistically higher) influenced analyzed variables; number of total pods (NVT), number of full pods (NVC), straw yield (RP), crop growth rate (TCC), harvest index (CI) and yield (GY). Cutting the aerial part of soybean plants at 40 DAE does not reduce grain production. Treatment of soybean seed with Stimulate® increases productivity at 15% and up to 60 DAE significantly stimulates soybean growth and regrowth.

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“…The prevalence and importance of VBC in all soybean growing regions in the Americas are associated with its great ecological plasticity, as both immature and adult stages present different hormonal and behavioural responses (including migration) to different abiotic and biotic conditions such as larval density and food quality (Buschman et al 1981; Greene 1979; Hammond & Fescemyer 1987; Wagner et al 2011). This allows local populations, or migrants from native preferential host plants, to colonise soybean plantations, which have high nutritional value, soon after their implantation, at the beginning of cultivation (Conti & Waddill 1982; Herzog & Todd 1980; Moscardi et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Development of microsatellite markers and genetic diversity of the velvetbean caterpillar Anticarsia gemmatalis (Lepidoptera: Erebidae)

et al. 2023

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The velvetbean caterpillar Anticarsia gemmatalis (VBC) is widely distributed in the Americas and causes severe damage to soybean foliage. This insect presents high ecological plasticity, a feature that is of great importance to understand its genetic diversity and potential gene flow to assist in resistance management strategies. With this objective, we developed microsatellite markers for VBC and applied them to five populations from Brazil. Nine primers were polymorphic, with high values of polymorphic information content (PIC > 0.5), and 134 alleles were identified in 155 individuals. These primers indicated deviation from the Hardy–Weinberg equilibrium for all populations (observed heterozygosity, Ho = 0.48, expected heterozygosity, He = 0.76), with moderate to high levels of genetic diversity and a moderate fixation index (FST = 0.14) among the populations. Analysis of population structure indicated the formation of two principal clusters. The northern one can be divided into the two populations that formed the cluster, with high genetic differentiation between them. The other cluster is formed by three populations, and we found evidence of low gene flow between them in the south–north direction, indicating that these populations may be migratory in certain conditions. These findings indicate that the designed primers were effective in describing the genetic diversity of VBC, with major implications for integrated pest management. Given the little gene flow and the high genetic diversity of populations, they present great potential to become resistant to control practices, which can lead to increased management costs.

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Resposta da cultura da soja a diferentes intensidades de injúria nos estágios iniciais de desenvolvimento

Abstract: This study evaluated the effects of different soybean injury levels at early growth stages of the plants. The experiments were carried out in two different

Cited by 11 publications

References 22 publications

Yield Response to Early Defoliation in Spring‐Planted Canola

Yield Response to Early Defoliation in Spring‐Planted Canola

Does the use of phytostimulants and the cutting times influence the productivity of the soybean crop?

Development of microsatellite markers and genetic diversity of the velvetbean caterpillar Anticarsia gemmatalis (Lepidoptera: Erebidae)

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