Weed control and green ear yield in maize

Silva, P.S.L.; Silva, E.S.; Mesquita, Sorieudes Santos Xavier

doi:10.1590/s0100-83582004000100017

Cited by 15 publications

(20 citation statements)

References 12 publications

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“…Such reductions varied from 22% in number of marketable unhusked green ears to 58% in marketable husked green ear weight. Other authors (Silva et al, 2004b;Silva et al, 2009) also verified green ear yield reduction as a result of corn competition with weeds.…”

Section: Resultsmentioning

confidence: 75%

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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Section: Resultsmentioning

confidence: 75%

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

et al. 2009

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“…Weeds have been a problem to man ever since he began cultivating crops about 10,000 BC (Silva et al, 2004). Its removal is useful because the unwanted plant compete with crops for water, soil nutrients, light and space, thus reducing crop yields (El Naim and Ahmed, 2010).…”

Section: Introductionmentioning

confidence: 99%

Effects of Intra-Row Spacing of Sesame (<i>Sesamum indicum</i> L.) and Frequency of Weeding on Yields of Maize-Sesame Intercrop in Makurdi, Nigeria

Ijoyah¹,

Idoko²,

Iorlamen³

2015

ILNS

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ABSTRACT. Field experiments were conducted from July to October, during 2012 and2013 cropping seasons, at the Research Farm, University of Agriculture, Makurdi, Nigeria, to evaluate the effects of intra-row spacing of sesame and frequency of weeding on yields of maize-sesame intercrop. The trial was a 3 x 3 factorial experiment fitted in a randomized complete block design with four replications. Nine of the treatments consisted of intercropped maize with sesame sown at the intra-row spacing of 10 cm, 15 cm and 20 cm, and at the varied weeding frequencies: maizesesame intercrop sown on plots weeded once (1x) at 3 weeks after planting (WAP); maize-sesame intercrop sown on plots weeded twice (2x) at 3 and 6 WAP; maize-sesame intercrop sown on plots not weeded (NW). Sole sesame and sole maize respectively sown at their recommended intra-row spacing of 10 cm and 30 cm and at their recommended frequency of weeding (2x at 3 and 6 WAP) constituted the tenth and eleventh treatments, which also served as control plots. The results obtained showed that in a maize-sesame intercrop, increasing intra-row spacing of sesame up to 20 cm, on plots weeded 2x at 3 and 6 WAP, significantly (P≤0.05) produced the highest intercrop yields of maize and sesame. This level of treatment not only recorded the lowest competitive pressure, but gave the highest total intercrop yields, highest land equivalent coefficient values (1.01 and 1.13 respectively, in years 2012 and 2013), indicating the highest yield advantage, and highest land equivalent ratio (LER) values of 2.11 and 2.25 respectively recorded for years 2012 and 2013. With these LER values, 52.6 % and 55.6 % of land were respectively saved in years 2012 and 2013, which could be used for other agricultural purposes. The implication of study showed that, to maximize intercrop yields of maize and sesame in a maize-sesame intercrop, the appropriate intrarow spacing for sesame is 20 cm, while the optimal frequency of weeding is 2x at 3 and 6 WAP. This should therefore, be recommended for Makurdi location, Nigeria.

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“…Similarly to what was observed in the present study, some authors (Silva et al, 2008) found a lack of weed control effect on total number of green ears (Table 2). However, other authors (Silva et al, 2004a) verified that total number of green ears in hoed plots was higher than in non-weeded plots, depending on the degree of interference. Such disagreement probably relates to the fact that those authors conducted three or four hoeings, which may have provided a much more effective weed control than in the present work and in other studies (Silva et al, 2008), in which only two hoeings were performed.…”

Section: Resultsmentioning

confidence: 96%

“…At those stages, corn competition with weeds for light should be higher. Be it as it may, several researchers (Gomes et al, 2007;Silva et al, 2004a) have observed reductions in corn plant height caused by weeds. Influence of corn sowing density and gliricidia intercropping ...…”

Section: Resultsmentioning

confidence: 99%

“…Such disagreement probably relates to the fact that those authors conducted three or four hoeings, which may have provided a much more effective weed control than in the present work and in other studies (Silva et al, 2008), in which only two hoeings were performed. It is important to point out that conducting three or four hoeings has proved uneconomical (Silva et al, 2004a).…”

Section: Resultsmentioning

confidence: 99%

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Influence of corn sowing density and gliricidia intercropping on weed control

et al. 2010

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-There is interest in the identification of the best seeding density for new corn hybrids and on reduced use of herbicides for weed control. The objective of this study was to evaluate the effects of seeding density (30, 50, 70, and 90 thousand plants ha -1 ) and weed control on green ear yield and grain yield in corn cultivar AG 1051. A completely randomized block design was adopted with split-plots (seeding densities assigned to plots) and ten replicates. Weed control was achieved by means of two hoeings and by planting corn intercropped with gliricidia (between corn rows, in pits spaced 0.3 m apart). A "no weeding" treatment was included as well. Increased seeding density increased the total number and weight of marketable green ears and decreased the biomass of both weeds and gliricidia. In non-weeded, intercropped and hoed plots, the maximum grain yield values achieved as seeding density increased were 7,881, 7,021, and 9,213 kg ha -1 , respectively, obtained with populations of 67 thousand, 74 thousand, and 67 thousand plants per hectare, respectively. Intercropping did not control weeds (26 species) and provided weed growth, green ear yield, and grain yield (at the lowest densities) similar to those obtained without hoeing, except for total number of green ears, in which no influence of weed control was observed. At densities of 70 thousand and 90 thousand plants per hectare, grain yield with two hoeings was not different from yield values obtained without weeding or in the treatment intercropped with gliricidia, respectively, indicating that increased corn seeding density as well as gliricidiamay help to control weeds.

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Weed control and green ear yield in maize

Cited by 15 publications

References 12 publications

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

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

Effects of Intra-Row Spacing of Sesame (<i>Sesamum indicum</i> L.) and Frequency of Weeding on Yields of Maize-Sesame Intercrop in Makurdi, Nigeria

Influence of corn sowing density and gliricidia intercropping on weed control

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