Alocação de matéria seca e capacidade competitiva de cultivares de milho com plantas daninhas

Carvalho, Frédéric A.; Santos, J.B.; Cury, J.P.; Silva, D. Valadão; Braga, Renan Rodrigues; Byrro, E.C.M.

doi:10.1590/s0100-83582011000200015

Cited by 27 publications

(22 citation statements)

References 22 publications

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“…The allocation of dry matter relates with efficiency of hydrolysis and translocation of assimilates. It is thus, an indication of seed quality (Carvalho et al, 2011). For the species B. brizantha, which is from the same family as corn, some cultivars produce a greater shoot dry mass when subjected to flooding (Kroth et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Yield and vigor of corn seeds under the influence of flooding periods

Monteiro¹,

Aisenberg²,

Koch³

et al. 2016

Afr. J. Agric. Res.

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The aim of this work was to characterize the physiological performance and some of the yield attributes of maize seeds in response to periods of temporary flooding. The study was conducted in an experimental design of randomized blocks, with four treatments composed by four replications, being evaluated the germination, the first count of germination, the germination speed index, the thousand seed weight, the number of seeds per ear, the number of rows per ear, the electrical conductivity in seeds, the length of shoot and primary root and the dry matter of shoot and primary root. Thousand seed weight, number of seeds per ear, number of rows per ear and electrical conductivity in seeds were reduced when plants were exposed to a 72 h flooding period. The flooding period of 72 h adversely affects the growth, the physical characteristics and the vigor of maize seeds.

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Section: Resultsmentioning

confidence: 99%

Yield and vigor of corn seeds under the influence of flooding periods

Monteiro¹,

Aisenberg²,

Koch³

et al. 2016

Afr. J. Agric. Res.

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“…Do mesmo modo, Carvalho et al (2011) relatam reduções tanto da parte aérea quando de raízes do milho quando em competição com essas plantas daninhas.…”

Section: Resultsunclassified

Crescimento do pinhão-manso em competição com plantas daninhas em dois tipos de solo

Ferreira

Silva

Santos

et al. 2014

Agraria

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RESUMOObjetivou-se, neste trabalho, avaliar o efeito de seis espécies de plantas daninhas cultivadas em competição com plantas de pinhão-manso (Jatropha curcas L.) em um Latossolo Vermelho-Amarelo (LVA) e um Neossolo Quartzarênico (NQ). Para tal foi realizado experimento no delineamento em blocos casualizados com quatro repetições. Os tratamentos foram arranjados em esquema fatorial 2x6, sendo o primeiro fator representado por dois tipos de solo (LVA e NQ) e o segundo pelas seis espécies de plantas daninhas cultivadas juntamente com a cultura (Ageratum conyzoides L., Bidens pilosa L., Cenchrus echinatus L., Commelina benghalensis L., Emilia fosbergii N.), além de testemunha sem competição. As espécies daninhas afetaram negativamente o crescimento de pinhão-manso, tanto no LVA quanto no NQ. Dentre as espécies avaliadas, C. echinatus e E. fosbergii promoveram maior efeito negativo quando em competição com plantas de pinhão-manso, para a maioria das variáveis testadas. As plantas de J. curcas apresentaram melhor tolerância à perda de matéria seca da parte aérea quando em competição sob LVA, situação contrária para o sistema radicular quando referida oleaginosa foi cultivada em amostras de NQ. O crescimento do pinhão-manso é afetado pela competição com as plantas daninhas mas a magnitude deste efeito é dependente da espécie competidora e do solo utilizado. Palavras-chave: interferência, Jatropha curcas L., potencial competitivo Jatropha growth in competition with weeds in two types of soil ABSTRACTWe aimed with this study to evaluate the effect of six weed species grown in competition with plants of jatropha (Jatropha curcas L.) in Red Yelow Oxisol (LVA) and Quartizarenic Neossol (NQ). The experiment was installed in randomized blocks design with four replications. The treatments were arranged in a 2x6 factorial design, with the first factor represented by two soil types (LVA and NQ) and six weed species (Ageratum conyzoides L., Bidens pilosa L., Cenchrus echinatus L., Commelina benghalensis L., Emilia fosbergii N.) grown along with the crop, plus a control with no competition. Presence of weeds negatively affected growth of jatropha both in LVA and NQ. Among the studied species, C. echinatus and E. fosbergii promoted greater negative effect on jatropha, for most of the variables tested. J. curcas showed better tolerance to reductions in shoot dry matter accumulation when in competition under LVA, a situation contrary to the root system when this oil crop was grown in NQ.soil The growth of jatropha is affected by competition with weeds, but the magnitude of this effect is dependent on the weed species and type of soil.

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“…As naturally occurring species, weeds have genetic variability that guarantees them a high competitive ability [5], whether annual or perennial.…”

Section: Introductionmentioning

confidence: 99%

Weed Interference in the Morphophysiological and Nutritional Characteristics of Erva-Mate (<i>Ilex paraguariensis</i>)

David¹,

Galon²,

Perin³

et al. 2018

AJPS

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The erva-mate (Ilex paraguariensis) represents an alternative crop for agricultural exploitation in South Brazilian farms with potential to export the harvested product. However, there is scarce information about the interference caused by weeds on this crop. The objective of this work was to evaluate the interference of weed species on the morphophysiological and nutritional characteristics of erva-mate. The experiment was installed in greenhouse at the Federal University of Fronteira Sul (UFFS), Campus Erechim/RS, Brazil, in randomized blocks design, arranged in a 4 × 6 factorial scheme, with four replications. In factor A, weed species (Urochloa plantaginea-Alexandergrass, Bidens pilosa-Hairy beggarticks, Ipomoea indivisa-Morning glory and Conyza bonariensis-Hairy fleabane) were allocated, and in B the populations of these species competing with the erva-mate (0, 1, 2, 3, 4 and 5 plants per pot) were considered. The variables evaluated in erva-mate were sub-stomatal CO 2 concentration, photosynthetic rate, CO 2 consumed, stomatal conductance, transpiration rate, water use efficiency, height, stem diameter, leaf area and shoot dry mass. Concentrations of nitrogen (N), phosphorus (P), calcium (Ca) and magnesium (Mg) were also evaluated. Overall, all weed species and densities among the tested ones harmed the development of erva-mate plants, which was considered as low competitive with weeds.

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Alocação de matéria seca e capacidade competitiva de cultivares de milho com plantas daninhas

Cited by 27 publications

References 22 publications

Yield and vigor of corn seeds under the influence of flooding periods

Yield and vigor of corn seeds under the influence of flooding periods

Crescimento do pinhão-manso em competição com plantas daninhas em dois tipos de solo

Weed Interference in the Morphophysiological and Nutritional Characteristics of Erva-Mate (<i>Ilex paraguariensis</i>)

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Alocação de matéria seca e capacidade competitiva de cultivares de milho com plantas daninhas

Cited by 27 publications

References 22 publications

Yield and vigor of corn seeds under the influence of flooding periods

Yield and vigor of corn seeds under the influence of flooding periods

Crescimento do pinhão-manso em competição com plantas daninhas em dois tipos de solo

Weed Interference in the Morphophysiological and Nutritional Characteristics of Erva-Mate (&lt;i&gt;Ilex paraguariensis&lt;/i&gt;)

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Product

Resources

About

Weed Interference in the Morphophysiological and Nutritional Characteristics of Erva-Mate (<i>Ilex paraguariensis</i>)