Influence of Nitrogen Rate, Seeding Rate, and Weed Removal Timing on Weed Interference in Barley and Effect of Nitrogen on Weed Response to Herbicides

Kumar, Vipan; Jha, Prashant

doi:10.1614/ws-d-16-00047.1

Cited by 5 publications

(14 citation statements)

References 33 publications

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“…azevém (Figura 4), observando-se reduções drásticas dessa variável nas populações mais baixas da competidora, com estabilização a partir de densidades superiores a 16 plantas. Resultados semelhantes foram mensurados por Kumar & Jha (2017), observando a diminuição da biomassa da cevada em 10% quando a mesma competiu com plantas daninhas. A massa seca da parte aérea do azevém (MSPAA) apresentou relação linear positiva com o aumento das densidades populacionais da espécie, o que evidencia a elevada competitividade do azevém, pois mesmo em elevadas populações elevou seu acúmulo de massa.…”

Section: /6unclassified

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Habilidade competitiva de cevada em convivência com densidades de azevém

Pies

Werlang

Luz

et al. 2019

Agraria

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AGRONOMIA (AGRONOMY)RESUMO: A cultura da cevada vem ganhando espaço na região sul do Brasil, sendo uma importante opção para rotação de culturas no período de inverno. Um dos principais limitantes para o aumento da produtividade da cultura é a competição com plantas daninhas, principalmente o azevém. Sendo assim, objetivou-se com esse trabalho avaliar a habilidade competitiva da cevada (Hordeum vulgare) com o azevém (Lolium multiflorum) e mensurar em qual densidade de azevém há comprometimento do desenvolvimento e produtividade da cultura. Para isso foi conduzido um experimento a campo, sendo utilizado delineamento experimental de blocos casualizados, onde a cevada conviveu com diferentes densidades de azevém (0, 4, 8, 16, 32, 64 e 128 plantas m -2 ). As variáveis analisadas foram: altura da planta, teor de clorofila, número de colmos da cevada e do azevém, massa seca da cevada e do azevém, área foliar, número de espigas, número de grãos por espiga, peso de mil grãos e produtividade. O azevém interfere negativamente no desenvolvimento e produtividade da cevada, mesmo em baixas densidades, sendo necessário seu controle a partir de quatro plantas m -2 . ABSTRACT:The barley culture has been conquering space in Southern Brazil, being an option for rotation with wheat. One of the main constraints for the increased productivity is the race against weed, especially ryegrass. Therefore, this study aimed to evaluate the barley competitive ability (Hordeum vulgare) against the ryegrass (Lolium multiflorum), in relation to the nitrogen absorption and to measure the density in which the culture is negatively affected. For this, a field experiment was conducted using experimental designs of randomized blocks, where the barley coexisted with different ryegrass densities (0, 4, 16, 32, 64 and 128 m -2 ). The analyzed varieties were plant height, chlorophyll, number of barley and ryegrass stems, barley and ryegrass dry mass, leaf area, number of spikes, number of grains per spike, the weight of a thousand grains and yield. The ryegrass interferes negatively on the barley's development and productivity, even in low densities, being necessary its control to four plants m -2 .Habilidade competitiva de cevada em convivência com densidades de azevém Rev. Bras.

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“…A deficiência desse nutriente pode comprometer de forma considerável a produtividade da cevada (Wamser & Mundstock, 2007). A adição de nitrogênio pode atrasar o período crítico de controle de plantas daninhas em 1,3 semanas (Kumar & Jha, 2017), aumentando assim a habilidade competitiva da cultura.…”

Section: Introductionunclassified

Habilidade competitiva de cevada em convivência com densidades de azevém

Pies

Werlang

Luz

et al. 2019

Agraria

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“…Weed affects the stability of alfalfa stands because of competition with alfalfa for light, nutrients, and water resources, which result in decreased yields and quality [10][11]. Herbicide application is a widespread practice in many production systems for efficient weed control, but they have the potential to cause serious environmental pollution [12], particularly of ground and surface water [13][14]. In addition, some weeds become Pol.…”

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Effect of Nitrogen Fertilizer and Seeding Rate on Yield of Alfalfa and Weeds

Xie

2018

Pol. J. Environ. Stud.

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Weed infestation is a serious problem in an agroecosystem. It can decrease crop yield and degrade the environment. Under the background of global warming, weed management has become more complex and full of uncertainty. Though some studies show that CO 2 removal has been accomplished in a special urban city and park area, scientific observations show that the concentration of CO 2 is still increasing in the atmosphere [1][2][3][4][5][6][7]. Alfalfa (Medicago sativa L.) is one of the most important perennial forage legumes cultivated in the world because of its high nutritive quality and yield [8]. Weed invasion also is a serious problem for alfalfa cultivation, especially in seeding year and older stands [8][9]. Weed affects the stability of alfalfa stands because of competition with alfalfa for light, nutrients, and water resources, which result in decreased yields and quality [10][11]. Herbicide application is a widespread practice in many production systems for efficient weed control, but they have the potential to cause serious environmental pollution [12], particularly of ground and surface water [13][14]. In addition, some weeds become Pol. J. Environ. Stud. Vol. 27, No. 2 (2018), 647-653 AbstractApplying nitrogen (N) to increase alfalfa (Medicago sativa L.) yield is a general practice in China that has caused serious weed infestation problems. Our objective was to determine the effect of N fertilizer and seeding rate on yields of alfalfa and weeds. The effects of four N fertilizer gradients (0, 50, 100, and 150 kg N hm -2 ) and five alfalfa seeding rates (0, 5, 7.5, 10, and 15 kg hm -2 ) were examined on dry matter of alfalfa and weeds using a three-year in situ controlled trial. The results showed:• There were no significant differences among N fertilizer (N) for dry matter of alfalfa (DMA) during three years. Dry matter of grassy weeds (DMGW) and broadleaf weeds (DMBW) were significantly increased with the N fertilizer gradient in the seeding year.• DMA was significantly increased with the seeding rates gradient in both 2012 and 2013. DMGW and DMBW were significantly decreased with the seeding rates gradient in all three years.• Interactions between N fertilizer and seeding rates on DMA and DMBW in 2012 and DMGW and DMT in 2013 are significant (p<0.05). Although the study demonstrated that increasing seeding rate can suppress weed invasions, N fertilizer facilitated them.

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“…This makes it possible to evaluate the gain obtained according to the treatment used (Agostinetto et al 2010;Tavares et al 2019;Galon et al 2019). Studies on the interference and competitiveness of crops with weeds contribute to the development of more effective weed management strategies with less impact on the environment (Jha et al 2017;Kumar and Jha 2017;Meulen and Chauhan 2017;Galon et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Journal of Plant Protection Research

Galon,

Basso,

Forte

et al. 2022

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Determination of interference periods, competitive ability and economic threshold level (ETL) are important tools for integrated weed management (IWM) in barley. The objective of the work was to determine the periods of interference, the competitive ability and the ETL of weeds in barley (Hordeum vulgare). Two field experiments were carried out, in a randomized block design, with four replications. In this study, the periods of coexistence and control for ryegrass (Lolium multiflorum) and turnip (Raphanus raphanistrum) infesting barley cultivar, cv. ANA 01 were evaluated. The coexistence periods and/or control were: 0, 7, 14, 21, 28, 35, 42 and 120 days after barley emergence (DAE). In experiment 2the treatments for determination of ETLs were composed by barley cultivars (BRS Suábia, ANA 01, BRS Korbel, BRS Manduri, BRS Cauê and BRS Greta), and turnip densities, from zero (0) to maximum densities of 816, 788, 948, 394, 584 and 618 plants • m −2 , in competition with each cultivar. Control of turnip and ryegrass should be adopted in barley in the period between 12 to 22 DAE, which is described as a critical control period. The rectangular hyperbola adequately estimates losses in grain yield due to turnip infestation. There is an effect on the competitive ability of the cultivars in relation to turnip, which resulted in ETLs that ranged from 0.27 to 1.99 plants • m −2 . The cultivars BRS Greta, BRS Suábia, ANA 01 and BRS Manduri were the most competitive in the presence of turnip.

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Influence of Nitrogen Rate, Seeding Rate, and Weed Removal Timing on Weed Interference in Barley and Effect of Nitrogen on Weed Response to Herbicides

Cited by 5 publications

References 33 publications

Habilidade competitiva de cevada em convivência com densidades de azevém

Habilidade competitiva de cevada em convivência com densidades de azevém

Effect of Nitrogen Fertilizer and Seeding Rate on Yield of Alfalfa and Weeds

Journal of Plant Protection Research

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