Modelling the population dynamics of annual ryegrass (Lolium rigidum) under various weed management systems

González‐Andújar, José Luis; Fernández‐Quintanilla, César

doi:10.1016/j.cropro.2003.12.007

Cited by 42 publications

(59 citation statements)

References 20 publications

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“…We used a life cycle‐based model similar to the one originally proposed by Sagar and Mortimer (1976), which has been modified and used many times (Doyle, 1991; Gonzalez‐Andujar & Fernandez‐Quintanilla, 1991, 2004; Cousens & Mortimer, 1995; Gonzalez‐Andujar et al. , 2005).…”

Section: Methodsmentioning

confidence: 99%

Modelling the population dynamics of Papaver rhoeas under various weed management systems in a Mediterranean climate

2008

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Summary The demography of the annual dicotyledonous weed Papaver rhoeas and the efficacy of different management practices were studied during three consecutive years in winter cereals in the north‐east of Spain. These data were used to estimate the parameters of a weed life cycle model that was used to describe the population dynamics of this species and to predict the effect of various control strategies and integrated weed management (IWM) scenarios. Without control, the annual rate of increase was 40 (λt), and the minimum control level required to maintain the population stable was 99% of the emerged plants. The annual application of post‐emergence and/or pre‐emergence herbicides did not prevent the growth of the population. Using various cultural control tactics (delayed seeding, harrowing and fallow) resulted in different trends in the overall population depending on the techniques and combinations analysed. Simulations showed that delayed seeding, fallow and pre‐emergence herbicides are the best techniques to employ in IWM programmes, always using a combination of these and other more common practices (i.e. post‐emergence herbicides). Sensitivity analysis indicated interaction between the parameters and that the model was especially sensitive to seed losses and also to fecundity, seedling survivorship and emergence. The study shows that new strategies should be sought to control these parameters. To develop IWM programmes for P. rhoeas, the combination of two or more control strategies is required.

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Section: Methodsmentioning

confidence: 99%

Modelling the population dynamics of Papaver rhoeas under various weed management systems in a Mediterranean climate

2008

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“…The integration of competitive traits into a breeding program could enhance the competitiveness of commercial sorghum cultivars, thereby suppressing weed growth and seed production. Small changes in seed production will significantly influence the size of the seed bank and reduce the subsequent weed pressure (Gonzalez‐Andujar & Fernandez‐Quintanilla 2004). More competitive sorghum crops would have significant long‐term benefits for weed management via a reduction in the addition of new weed seeds to the soil seed bank.…”

Section: Resultsmentioning

confidence: 99%

Competition of sorghum cultivars and densities with Japanese millet (Echinochloa esculenta)

Osten

Robinson

2010

Weed Biology and Management

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Field studies were conducted at two locations in southern Queensland, Australia during the 2003-2004 and 2004-2005 growing seasons to determine the differential competitiveness of sorghum (Sorghum bicolor L. Moench) cultivars and crop densities against weeds and the sorghum yield loss due to weeds.Weed competition was investigated by growing sorghum in the presence or absence of a model grass weed, Japanese millet (Echinochloa esculenta). The correlation analyses showed that the early growth traits (height, shoot biomass, and daily growth rate of the shoot biomass) of sorghum adversely affected the height, biomass, and seed production of millet, as measured at maturity."MR Goldrush" and "Bonus MR" were the most competitive cultivars, resulting in reduced weed biomass, weed density, and weed seed production.The density of sorghum also had a significant effect on the crop's ability to compete with millet.When compared to the density of 4.5 plants per m 2 , sorghum that was planted at 7.5 plants per m 2 suppressed the density, biomass, and seed production of millet by 22%, 27% and 38%, respectively. Millet caused a significant yield loss in comparison with the weed-free plots. The combined weed-suppressive effects of the competitive cultivars, such as MR Goldrush, and high crop densities minimized the yield losses from the weeds. These results indicate that sorghum competition against grass weeds can be improved by choosing competitive cultivars and by using a high crop density of >7.5 plants per m 2 .These non-chemical options should be included in an integrated weed management program for better weed management, particularly where the control options are limited by the evolution of herbicide resistance.

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“…Although the economic analysis of the various treatments tested was made using a short‐term tactical approach (assessing weed infestation and responding the same year with an herbicide application), this may not be the best approach (Colbach & Debaeke, 1998). Using a strategic approach (planning herbicide use over several years) may optimise weed control and economic returns (Gonzalez‐Andujar & Fernandez‐Quintanilla, 2004). In highly variable conditions, such as those present in Mediterranean countries, consultants and farmers are very reluctant to take long‐term weed management decisions.…”

Section: Discussionmentioning

confidence: 99%

Assessment of a decision support system for chemical control of annual ryegrass (Lolium rigidum) in winter cereals

González‐Andújar

Fernández‐Quintanilla²,

Bastida

et al. 2011

Weed Research

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Field studies were conducted at five locations in North and East Spain to evaluate the agronomic, economic and environmental implications of a decision support system (LOLIUM-PC) for herbicide control of Lolium rigidum in winter cereals. The chemical control treatments evaluated were as follows: (i) LOLIUM-PC-based recommendations, (ii) full herbicide dose (standard farmer practice) and (iii) half herbicide dose. Results indicate that there were no statistically significant differences, within sites, between treatments with respect to weed density, crop yield and economic return. On average, LOLIUM-PC resulted in less herbicide application compared with the full herbicide dose treatment. This also was true in three of five localities for the half-dose treatment. The results of this research indicate that LOLIUM-PC provides a flexible tool for recommending less herbicide than other herbicide decision systems, adequate weed control and similar crop yields to those obtained with the standard farmer practice (full dose) in Spain.

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Modelling the population dynamics of annual ryegrass (Lolium rigidum) under various weed management systems

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Cited by 42 publications

References 20 publications

Modelling the population dynamics of Papaver rhoeas under various weed management systems in a Mediterranean climate

Modelling the population dynamics of Papaver rhoeas under various weed management systems in a Mediterranean climate

Competition of sorghum cultivars and densities with Japanese millet (Echinochloa esculenta)

Assessment of a decision support system for chemical control of annual ryegrass (Lolium rigidum) in winter cereals

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