The effect of leaf area reduction on corn plants during the reproduction phase

Alvim, Karen Rodrigues de Toledo; Brito, Césio Humberto de; Brandão, Afonso Maria; Gomes, Luiz Savelli; Lopes, Maria Teresa Gomes

doi:10.1590/s0034-737x2011000400002

Cited by 9 publications

(5 citation statements)

References 9 publications

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“…Alvim et al (2011), trabalhando com a redução da área foliar acima da espiga em plantas de milho na fase reprodutiva, concluíram que, embora toda área foliar em milho seja importante na produção de fotoassimilados, é a área foliar acima da espiga a mais eficiente na conversão em produtividade de grãos. Do mesmo modo, Forna- não consegue exercer a eficiência necessária para realizar uma boa extração dos grãos e triagem das espigas pequenas e mal granadas (Alvim et al, 2011).…”

Section: Resultsunclassified

“…A disposição foliar na planta contribui diferentemente na produção e síntese de fotoassimilados, e o terço superior corrobora para um melhor rendimento das características produtivas, fato este também relatado por Gomes et al (2011), que observaram valores maiores de carboidratos nas folhas superiores em relação às folhas inferiores da planta, por que as folhas da parte superior são mais eficientes na captação de luz.…”

Section: Resultsunclassified

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Respostas Morfoagronômicas De Milho Submetido a Desfolha Artificial

Trogello

Borges

Oliveira

et al. 2017

RBMS

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RESUMO -O objetivo deste estudo foi avaliar as características morfoagronômicas do híbrido simples de milho em função da aplicação de diferentes intensidades de desfolha artificial, realizadas no estádio R1 de desenvolvimento. O experimento foi conduzido na área experimental do Instituto Federal Goiano,em Morrinhos-GO, na safra 2015/2016.Foi aplicado o delineamento de blocos completamente casualizados, com oito tratamentos e quatro repetições, sendo eles: remoção de uma folha acima e uma abaixo da espiga; remoção de duas folhas acima e abaixo da espiga; remoção de três folhas acima e abaixo da espiga; remoção de todas as folhas da planta; remoção de todas as folhas acima da espiga; remoção de todas as folhas abaixo da espiga; remoção da folha da espiga; e testemunha sem desfolha. Os caracteres avaliados foram: estande de plantas, número de plantas acamadas, prolificidade, densidade de colmo, comprimento e diâmetro de espiga, comprimento de grão, massa de mil grãos, massa de grãos espiga -1 e produtividade. Os dados foram submetidos à análise de variância pelo teste F a 5% de probabilidade, observando que todas as variáveis avaliadas foram influenciadas quanto aos efeitos dos tratamentos empregados. O enchimento dos grãos esteve intimamente relacionado à fotossíntese. Sem as folhas, esta fase ficou plenamente comprometida. Palavras-chave:Zea mays, fotoassimilados, translocação, índice de área foliar, rendimento. MORPHOAGRONOMIC CHARACTERISTICS OF MAIZE AS A FUNCTION OF DIFFERENT LEVELS OF ARTIFICIAL DEFOLIATIONABSTRACT -The objective of this study was to evaluate of morphoagronomic characteristics of simple hybrids of maize, depending on the application of different intensities of artificial defoliation, carried out in R1, when the style-stigma were fertilized. The experiment was conducted in an experimental area of the Instituto Federal Goiano, Campus Morrinhos, State of Goiás, Brazil, during the agricultural year 2015/2016. We applied the design of completely randomized block with eight treatments, in four replications: removal of a leaf above and one below the ear; removal of two leaves above and below the ear; removal of three leaves above and below the ear; removal of all leaves of the plant; removal of all leaves above the ear; removal of all leaves below the ear; removal of the leaf of the ear; and control without defoliation. The traits evaluated were stand of plants, number of plant lodging, prolificacy, density, length and diameter of the cob, length of a grain, weight of a thousand grains, grain mass cob -1 and productivity. The data obtained were subjected to analysis of variance by F test at 5% probability, noting that all variables were influenced as to the effects of the treatments used. The filling of grains is closely related to photosynthesis. Without the leaves, this phase was fully damaged.

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Section: Resultsunclassified

Respostas Morfoagronômicas De Milho Submetido a Desfolha Artificial

Trogello

Borges

Oliveira

et al. 2017

RBMS

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“…This fact is probably related to stem photoassimilates, as emphasized in literature by Alvim et al (2010) and Sangoi et al (2012). For Sangoi et al (2001), hybrids that have the characteristic to redirect stem sugars to another part of the plant, have greater agronomic stability, which may have occurred in this Means followed by the same lowercase letter in line and capital letter in column are from the same group according to Scott Knott test at 5% of probability.…”

Section: Resultsmentioning

confidence: 78%

Morphoagronomic traits of BRS 610 sorghum submitted to artificial defoliation

Zuffo¹,

Zuffo²,

Silva³

et al. 2015

Afr. J. Agric. Res.

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The objective of this study was to evaluate the agronomic traits of BRS 610 forage sorghum, based on developmental stages and defoliation levels. The experiment was conducted in a protected environment, located in União experimental farm, in Nova Xavantina-MT, in vases with 8 dm -3 capacity in soil classified as dystrophic red latosol. The experimental design was a randomized block, arranged in a 4 x 3 + 1 factorial, four stages of defoliation [three expanded leaves (15 days after emergence of plants -DAE), six expanded leaves (30 DAE), panicle differentiation (45 DAE), booting (60 DAE)] and three levels of defoliation [(33, 66 and 99%) and an additional treatment without defoliation], making the total of 13 treatments with three replications. BRS 610 sorghum crop was used. It was evaluated plant height, stem diameter, root dry mass and shoot dry mass. Except for plant height and stem diameter, for the other variables there were significant influences of defoliation levels. To root mass and shoot dry mass it was verified that less intense defoliation and the early stages affect less those variables. To root dry mass, reductions are evident up to 66.36% when the plants are submitted to total leaves removal at the stage of panicle differentiation. The production of shoot dry mass of the BRS 610 sorghum is affected when submitted to any level and defoliation stage.

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“…A high ear insertion height predisposes plants to lodge and also disfavors the accumulation of carbohydrates in the grains [27]. Because the leaves above the ear are more efficient in grain yield [28]. On the other hand, plant height and low ear insertion may result in losses in mechanized harvesting and a decrease in grain purity [29].…”

Section: Resultsmentioning

confidence: 99%

Agronomic Performance of Corn Cultivars as a Function of Phosphorus Use

Maciel

Santos

Pelúzio

et al. 2020

ARRB

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Aims: The research was carried out to evaluate the agronomic performance of corn cultivars in contrasting phosphorus environments in the state of Pará, Brazil. Study Design: The experimental design was randomized blocks with ten treatments and three replications. The treatments were composed of ten cultivars: AG 1051, AG 8088PRO2, BR 206, BRS 3046, PR 27D28, 2B655PW, AL BANDEIRANTE, ANHEMBI, CATIVERDE 02 and ORION Place and Duration of Study: In the 2017/18 crop, two competition trials of corn cultivars were carried out at Sítio Vitória, municipality of Santa Maria das Barreiras, state Pará, Brazil. Methodology: Two competition trials of corn (Zea mays L.) cultivars were carried out under contracting conditions of phosphorus: high P (100 kg ha-1 of P2O5) and low P (50 kg ha-1 of P2O5), using simple superphosphate (18% P2O5) as the source. The agronomic efficiency of phosphorus use was obtained by the difference between grain yield in both levels, divided by the difference between doses. The variables evaluated were: ear height, plant height, ear diameter, number of rows per year, number of grains per rows and grain yield. Results: The mean grain yield of the cultivars ranged from 5,446 kg ha-1 (low P) to 11,486 kg ha-1 (high P), and the means of all cultivars were higher in high P. The means agronomic efficiency ranged from 25.1 kg kg-1 (AL BANDEIRANTE) to 96.6 kg kg-1 (AG 1051). Conclusion: The highest phosphorus dose (100 kg ha-1 of P2O5) resulted in higher values in the variables studied. The cultivars that stood out the most, under high and low phosphorus, were AG 8088PRO2, AG 1051 and BRS 3046, the last two being agronomically efficient.

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The effect of leaf area reduction on corn plants during the reproduction phase

Cited by 9 publications

References 9 publications

Respostas Morfoagronômicas De Milho Submetido a Desfolha Artificial

Respostas Morfoagronômicas De Milho Submetido a Desfolha Artificial

Morphoagronomic traits of BRS 610 sorghum submitted to artificial defoliation

Agronomic Performance of Corn Cultivars as a Function of Phosphorus Use

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