The influence of wheat density and spatial arrangement on annual ryegrass, Lolium rigidum Gaudin, competition

Medd, R. W.; Auld, B. A.; Kemp, David; Murison, R. D.

doi:10.1071/ar9850361

Cited by 74 publications

(57 citation statements)

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“…To a lesser extent, the number of grains per ear (GUI00 and WH96) also contributed to the yield losses recorded. The ability of weeds to affect crop grain number and tiller number is well established [5,20]. Thousand grain weight was the yield component least affected by weed competition.…”

Section: Discussionmentioning

confidence: 99%

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Effects of crop and weed densities on the interactions between barley and Lolium rigidum in several Mediterranean locations

Izquierdo¹,

Guinjuan²,

Fernández‐Quintanilla³

et al. 2003

Agronomie

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-The effects of both barley and Lolium rigidum densities on weed growth and spike production and on crop yield were examined in five field experiments carried out in the Mediterranean drylands of Spain and Western Australia. The aim was to check the consistency of the competitiveness of the crop in different environmental and management conditions. L. rigidum reduced barley yields in most of the experiments (between 0 and 85%), the number of ears per m 2 being the most affected. It was found that increasing the barley seeding rate did not reduce the crop losses but did limit weed biomass (between 5 and 61%) and spike production (between 24 and 85%). The variability observed in crop yield losses between sites and seasons was related to rainfall at the beginning of the season. The most sensitive component of yield to weed competition was the number of ears per plant.

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Section: Discussionmentioning

confidence: 99%

“…Lemerle et al [18] have shown that the genetic variability present in Australian wheat varieties can be used to increase competitiveness of the crop. Alternatively, manipulating crop agronomy, such as increasing the crop seeding rate [20,29], may be a practical alternative.…”

Section: Introductionmentioning

confidence: 99%

Effects of crop and weed densities on the interactions between barley and Lolium rigidum in several Mediterranean locations

Izquierdo¹,

Guinjuan²,

Fernández‐Quintanilla³

et al. 2003

Agronomie

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“…On black earth soils on the Darling Downs in Queensland, large reductions in wild oat biomass and seed production and a consequent increase in wheat grain yield due to increase in wheat density have been reported. 29 In a later study, Medd et al 30 in New South Wales found that competitive e †ects of annual ryegrass on wheat were substantially reduced by increasing wheat sowing density.…”

Section: Increased Crop Density For Weed Suppressionmentioning

confidence: 98%

Efficacy of cultural control methods for combating herbicide-resistantLolium rigidum

Gill

Holmes²

1997

Pestic. Sci.

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: Herbicide-resistant populations of annual ryegrass (L olium rigidum) are estimated to a †ect crop production on about 5000 farms in southern Australia. In order to manage resistant populations, some farmers have adopted a two-tothree-year pasture phase which allows use of grazing by sheep, and non-selective herbicides to deplete the weed seed-bank. However, in low-to-medium rainfall zones, where Ðnancial returns from pastures are relatively low, farmers have generally combined cultural practices for weed management with the use of alternative herbicides, mainly triÑuralin. Used singly, none of the currently available cultural techniques provides an adequate level of weed control. However, when used in carefully planned combinations, extremely e †ective ryegrass control can be achieved. Some of the important cultural practices for ryegrass control include delayed sowing (sometimes in conjunction with a shallow autumn cultivation) ; stubble burning ; cutting the crop for hay or green manure, increased crop density and capture of weed seeds at harvest. Selection of crop species and cultivars with superior weed suppression potential is also receiving considerable attention.

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“…However, the higher value observed in 2010/11 in F1 could be attributed to other factors. As has been established for other grass weeds (Medd et al, 1985;Cousens et al, 1988;Izquierdo et al, 2003), the strongest crop competition takes place early in the growing seasons, affecting weed tillering. The stress caused by lack of rain until February in the winter of 2010/11 reduced the competitive effect of the crop and, though the plants were smaller, they had more tillers.…”

Section: Vegetative and Reproductive Fitnessmentioning

confidence: 99%

Integrated effect of crop sowing date and herbicide stress on fitness of Bromus diandrus Roth

García

Royo‐Esnal

Torra

et al. 2015

Span. j. agric. res.

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Bromus diandrus Roth is a common weed species that has increased in no-tillage dry-land cereal fields in NE Spain because of the limited control options. The fitness response of plants with different emergence times (ETs) and its influence on demography has huge implications in weed management. With this subject, three ETs (F1, F2 and F3) of B. diandrus were established through three crop-sowing dates (D1, Oct.; D2, Nov.; D3, Dec.) for each of the three years in a barley-wheat-wheat rotation. In barley, the herbicides applied were not specific for B. diandrus, whereas in wheat the specific herbicide mesosulfuron-methyl plus iodosulfuron-methyl-sodium was applied. Plant density after treatments and fitness characteristics were estimated for each weed ET. Weed density decreased for later ETs and fitness was density-dependent, showing significantly higher values when a non-specific herbicide was applied, except in number of caryopses per spikelet. The increasing fitness shown by plants with later ETs and the linear relationships of vegetative biomass vs reproductive biomass and fecundity were disrupted by the herbicide mesosulfuron-methyl plus iodosulfuron-methyl-sodium. Plants that had survived this herbicide when wheat was growing had lower values for all the characteristics analysed. After three seasons, as a consequence of decreasing seed recruitment, a practical depletion of the B. diandrus population was achieved in F2 and F3 (<2.8 and <1 plants/m2, respectively) but not in F1 (60.5 plants/m2). This study shows the importance of delayed crop sowing to optimize the control of B. diandrus in cereal fields with no tillage.

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The influence of wheat density and spatial arrangement on annual ryegrass, Lolium rigidum Gaudin, competition

Cited by 74 publications

References 0 publications

Effects of crop and weed densities on the interactions between barley and Lolium rigidum in several Mediterranean locations

Effects of crop and weed densities on the interactions between barley and Lolium rigidum in several Mediterranean locations

Efficacy of cultural control methods for combating herbicide-resistantLolium rigidum

Integrated effect of crop sowing date and herbicide stress on fitness of Bromus diandrus Roth

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