Estudo comparativo do acúmulo de massa seca e macronutrientes por plantas de milho var. BR-106 e Brachiaria plantaginea

Carvalho, Leonardo Bianco de; Bianco, S.; Pitelli, Robinson Antônio; Bianco,

doi:10.1590/s0100-83582007000200008

Cited by 36 publications

(31 citation statements)

References 11 publications

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“…plantaginea exhibited a fast initial increase in allocating resources to its root system, improving the plant attachment to the ground and facilitating competition for water and nutrients, which explains the RI found even at low density in the infesting community. In addition, this species exhibits greater accumulation of nitrogen, potassium, magnesium and sulfur per biomass unit than corn (Carvalho et al, 2007). However, even with such fast development, low densities of U. plantaginea seemed not to affect greatly the final corn yields, as observed in this and other studies, as the one conducted by Spader and Vidal (2000).…”

Section: Resultssupporting

confidence: 60%

Atrazine Reduces the Critical Period of Weed Interference on Narrow Row Corn

et al. 2016

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-The objective was to determine whether a change occurs in the critical period of weed interference prevention in narrow row corn with the use of atrazine and whether there is influence of the herbicide on crop yield components. The treatments consisted of periods without or with an initial weed control (0, 21, 35, 49, 63, 77, and 91 days after emergence), with or without application of atrazine in spikely post-emergence. The experiment was carried out in a 2 x 7 randomized blocks design (with and without weed control and seven periods with three replications). The use or not of atrazine was arranged in a split plot design. The most important weed species were Senecio brasiliensis, Urochloa plantaginea, Conyza bonariensis, Sida rhombifolia, and Solanum spp. Corn yield reduced by 15% and 18% with and without application of atrazine, respectively. The number of grains per spike and corn yield were negatively influenced by coexistence with weeds, while the number of rows per spike, the diameter and length of spike were not affected. Corn yield components were not affected by the use of atrazine. The critical period of weed interference prevention was 35 days without atrazine and 23 days with application of atrazine. There is a reduction of the critical period of weed interference prevention on narrow row corn by using atrazine, with no influence of the herbicide on crop yield.Keywords: herbicide, period of coexistence, Zea mays. (0, 21, 35, 49, 63, 77 RESUMO -O objetivo deste estudo foi verificar se ocorre alteração no período crítico de prevenção à interferência de plantas daninhas em milho adensado com o uso de atrazine e se há influência do herbicida sobre componentes de rendimento da cultura. Os tratamentos consistiram em períodos sem ou com controle inicial de plantas daninhas

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Section: Resultssupporting

confidence: 60%

Atrazine Reduces the Critical Period of Weed Interference on Narrow Row Corn

et al. 2016

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“…Many plant growth studies have been conducted in several crops, including corn. Corn growth evaluations have been carried out for parameters such as planting density (Sangoi et al, 2005), fertilizers (Wu et al, 2005), and competition with weeds (Lum et al, 2005;Carvalho et al, 2007). Despite being labor-intensive, growth studies provide explanations on aspects related to yield.…”

Section: Introductionmentioning

confidence: 99%

Growth and yield of corn grain and green ear in competition with weeds

et al. 2009

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Studies on plant growth are interesting because they provide explanations for the factors that influence yield in various crops. The objective of this work was to evaluate growth and yield in corn cultivar AG1051, when in competition with weeds. Cultivar AG 1051 was submitted to two groups of treatments: weed control, and sampling periods for dry biomass evaluation. The weed control treatments consisted of hoeing (two hoeings performed at 20 and 40 days after sowing) and no hoeing. Sampling periods consisted of collecting the above-ground part and roots of corn every fifteen days, until 105 days after sowing (DAS); the first sampling was performed 30 DAS. A completely randomized block design with ten replicates was used. For the characteristics evaluated in a single season, statistical analyses were carried out as a random block experiment. For the characteristics evaluated in several periods, statistical analyses were carried out as random blocks with split-plots (weed control assigned to plots). Fourteen weed species, unevenly distributed throughout the experimental area, were the most important. The growth observed for the above-ground part and root system of corn was 30% smaller in the non-hoed plots, compared to the hoed plots. Lack of weed control increased dry matter of the above-ground part of the weeds and reduced the number of unhusked and husked marketable green ears by 23% and 49%, respectively. Grain yield reduction caused by lack of weed control reached 38%.

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“…Nesse contexto, a competição por nutrientes é de grande importância, pois estes, na maioria das vezes, são limitados (CARVALHO et al, 2007). Em áreas de pastagem, normalmente, é recomendado a manutenção da saturação de bases próxima a 50%.…”

Section: Introductionunclassified