Componentes da produção em cultivares de soja com crescimento determinado e indeterminado

Perini, Luiz Junior; Júnior, Nelson Da Silva Fonseca; Destro, Deonisio; Prete, Cássio Egídio Cavenaghi

doi:10.5433/1679-0359.2012v33supl1p2531

Cited by 34 publications

(35 citation statements)

References 6 publications

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“…This is discussed below. The number of branches, racemes and total pods are the most important components for yield, and exhibit the highest correlation with the total yield (Pires et al, 2002;Perini et al, 2012). In the Conquista cultivar, the number of branches/plant decreased by 18.5% in T3 compared to T1 (Table 1).…”

Section: Plant Height Branches and Racemes Distributionsmentioning

confidence: 99%

Response of soybean yield components and allocation of dry matter to increased temperature and CO2 concentration

Pereira-Flores¹,

Justino²,

Ruiz‐Vera³

et al. 2016

Aust J Crop Sci

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Future climatic scenarios can influence crop yield levels and induce hunger if no actions are taken. In this study, we evaluated the effect of increased temperature and CO 2 concentration on soybean yield components and biomass partitioning, that ultimately determine the crops productivity. This is conducted for two soybean genotypes that differ in their canopy and life cycles. Experiments were set as follows: a) T1 -ambient temperature and 390 molCO 2 •mol -1 , b) T2 -ambient air temperature +2.7 o C and ambient CO2, and c) T3 -ambient air temperature + 2.7 o C and 750 molCO 2 •mol -1 . Results indicate that soybean under elevated CO 2 and temperature (T3), were taller and grains weighed more than under the ambient conditions in both cultivars types. However, yield has not increased substantially due to reductions in the ratio of number of branch/plant, pods/branch and grains/branch which lead also to a lesser number of total pods and grains per plant. The increase of temperature favored the number of pods and grains on branches in the modern type cultivar, and on racemes in the old cultivar. This results in more yield in both cultivars versus plants grown in the current ambient, and higher CO 2 concentration plus temperature. In both cultivars, the pods and grains partition were higher on the ontogenically oldest four branches and racemes, with decrease in the other upper ones. In addition, the biomass allocation in vegetative tissues was higher than reproductive biomass, with intensity cultivar dependent. We concluded that in future the yield could be limited by reduction of the numbers of branches and racemes in plant, and by alteration at source-sink relation, thus, indicating that changes in canopy architecture are needed to better take advantage of the increasing concentration of CO 2 .

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Section: Plant Height Branches and Racemes Distributionsmentioning

confidence: 99%

Response of soybean yield components and allocation of dry matter to increased temperature and CO2 concentration

Pereira-Flores¹,

Justino²,

Ruiz‐Vera³

et al. 2016

Aust J Crop Sci

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“…In cultivars of determinate growth habit, the apical meristem stops the differentiation of new leaves after floral induction, while in cultivars of indeterminate growth habit, the differentiation of leaves occurs over some time after the floral induction (Tanaka & Shiraiwa, 2009). In the last years, the search for soybean cultivars with indeterminate growth significantly increased in Brazil (Perini et al, 2012). This is due to the necessity of earlier sowing dates to allow of both the corn sowing as a second-crop and the reduction of the damage caused by Asian soybean rust, as plants with indeterminate growth habit have a more open canopy, which enables pesticide application to more easily reach the lower third of the plant.…”

Section: Introductionmentioning

confidence: 99%

Physiologic parameters of soybean of determinate and indeterminate growth habit subjected to levels of soil moisture

Júnior

Silva

Sanches

et al. 2017

Pesq. agropec. bras.

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-The objective of this work was to evaluate the physiological and production parameters of soybean (Glycine max) cultivars of determinate and indeterminate growth habits, in three levels of soil moisture. Three cultivars of determinate growth habit and three of indeterminate growth, at the beginning of the reproductive stage, were subjected to three levels of soil moisture: control, moisture at field capacity; moderated, 50% of the control level; and severe, 25% of the control level. Leaf gas exchange, xylem-water potential, chlorophyll content, chlorophyll a fluorescence, plant dry matter, and grain yield per plant were evaluated. The cultivars of indeterminate growth habit showed the greatest values for stomatal conductance and CO 2 assimilation at the severe treatment, which led to the higher water consumption, in the morning, and to the lower xylem water potential, in the afternoon; however, there was no gain of soybean dry matter. In both growth types, the intensity and duration of the severe level of soil moisture were not able to change the chlorophyll fluorescence. Soybean cultivars of both growth habits, subjected to severe levels of soil moisture from flowering to pod insertion, show no significant change for dry matter and grain yield.

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“…1000-grain weight variation is mainly linked to genetic characteristics of each cultivar, as there are cultivars that have fewer grains per plant, although they have positive response in the direction of assimilates for grain filling, resulting in higher grain matter (Perini et al, 2012). Pipolo et al (2005) found that there is high variation among soybean cultivars for 1000-grain weight.…”

Section: Resultsmentioning

confidence: 99%

Soybean morphological and productive characteristics influenced by meteorological parameters and sowing dates

Schwerz¹,

Caron²,

Elli³

et al. 2016

Científica

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The aim of this study was to evaluate the influence of meteorological elements on soybean morphological and productive characteristics in five sowing dates. The randomized block design was used in a 5x5 factorial, with the following five sowing dates during the year 2013: the first (10-15), second (10-30), third (11-15), fourth (30-11) and fifth (12)(13)(14)(15) 2013), and the following five soybean cultivars: BMX Alvo RR, BMX Veloz RR, CCGL Tec 5721 IPRO, BMX Tornado RR and CCGL Tec 7849 IPRO, with three repetitions. Total dry biomass, leaf area index, plant height, number of pods per plant, number of grains per plant, 1000-grain weight and yield were assessed. According to analysis of variance, significant difference was found for all variables in the cultivar x sowing date interaction. Soybean cultivars morphological and productive characteristics were influenced by meteorological elements and sowing dates. Leaf area index and total dry biomass had the highest means in 11-15 and 11-30, coinciding with the highest grain yield means, obtained for Veloz and Tornado cultivars, respectively. These results were obtained because these sowing dates had the best conditions, with air temperatures between 13.4 and 34.2 °C, accumulated solar radiation of 3074.009 MJ m -2 , accumulated thermal time of 1959.15 °C days and total rainfall of 732.8 mm.Additional keywords: Glycine max L.; leaf area index; solar radiation; thermal time; yield. ResumoO objetivo deste trabalho foi avaliar a influência dos elementos meteorológicos sobre as características morfológicas e produtivas da soja em cinco épocas de semeadura. O delineamento utilizado foi o de blocos ao acaso, em esquema fatorial 5x5, com cinco épocas de semeadura: primeira (15-10), segunda (30-10), terceira (15-11), quarta (30-11) e quinta (15-12 de 2013) e cinco cultivares de soja: BMX Alvo RR, BMX Veloz RR, CCGL Tec 5721 IPRO, BMX Tornado RR e CCGL Tec 7849 IPRO, com três repetições. Avaliaram-se a biomassa seca total, o índice de área foliar, a altura de plantas, o número de vagens por planta, o número de grãos por planta, a massa de mil grãos e a produtividade. De acordo com a análise de variância, constatou-se diferença significativa para todas as variáveis analisadas na interação cultivar x época de semeadura. As características morfológicas e produtivas das cultivares de soja são influenciadas pelos elementos meteorológicos e pela época de semeadura. O índice de área foliar e a biomassa seca total apresentam as maiores médias na época de semeadura do dia 15-11 e 30-11, coincidindo com as maiores médias de produtividade de grãos obtidas para as cultivares Veloz e Tornado, respectivamente. Tais resultados foram obtidos devido a esta época de semeadura apresentar as melhores condições, sendo a temperatura do ar entre 13,4 e 34,2°C, a radiação solar incidente acumulada de 3.074,009 MJ m -2 , a soma térmica acumulada de 1.959,15 °C dias e precipitação pluviométrica total de 732,8 mm.Palavras-chave adicionais: Glycine max L.; índice de área foliar; produtividade;...

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Componentes da produção em cultivares de soja com crescimento determinado e indeterminado

Cited by 34 publications

References 6 publications

Response of soybean yield components and allocation of dry matter to increased temperature and CO2 concentration

Response of soybean yield components and allocation of dry matter to increased temperature and CO2 concentration

Physiologic parameters of soybean of determinate and indeterminate growth habit subjected to levels of soil moisture

Soybean morphological and productive characteristics influenced by meteorological parameters and sowing dates

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