Spatial and temporal dynamics of <i>Sorghum halepense</i> patches in maize crops

Andújar, Dionisio; Barroso, Judit; Fernández‐Quintanilla, César; Dorado, José

doi:10.1111/j.1365-3180.2012.00937.x

Cited by 21 publications

(21 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…are a hurdle to the adoption of management systems based on band herbicide application + hoeing because mechanical tools can only partially control them. However, field distribution of perennials is usually constituted by a limited number of patches with quite stable positions and slow spatial expansion in the short term [27,28]. Localized application of specific post-emergence herbicides can therefore be an effective tactic to ensure good control efficacy with low herbicide use [29].…”

Section: Discussionmentioning

confidence: 99%

Combination of Herbicide Band Application and Inter-Row Cultivation Provides Sustainable Weed Control in Maize

et al. 2019

View full text Add to dashboard Cite

Herbicides have facilitated weed management but their incorrect use can lead to environmental contamination. Reducing herbicide use by limiting their application to a band along the crop row can decrease their environmental impact. Three field experiments were conducted in North-eastern Italy to evaluate herbicide band application systems integrated with inter-row hoeing for silage maize. Post-emergence herbicide band application (sprayed area 50% of total field; herbicide dose 50% of that recommended, application with an inter-row cultivator prototype) was compared with pre-emergence band application (sprayed area 33% of total field; herbicide dose 33% of that recommended, application with a seeder) and pre-emergence broadcast application (sprayed area 100% of total field; full recommended herbicide dose, application with a boom sprayer) that is standard management for maize. Weed density and composition were evaluated before and after post-emergence herbicide application and at crop harvest. Crop yield was also recorded. Weed density in untreated areas ranged between 5 and 15 plants m −2 in the different experiments. Optimal weed control and good yields were achieved without significant differences between all treatments. Herbicide band application can provide optimal weed control in silage maize, at the same time allowing a relevant reduction of herbicide input.

show abstract

Section: Discussionmentioning

confidence: 99%

Combination of Herbicide Band Application and Inter-Row Cultivation Provides Sustainable Weed Control in Maize

et al. 2019

View full text Add to dashboard Cite

show abstract

“…These subterranean structures are likely to suffer from soil compaction, whereas the small seeds of thornapple do not. However, the seeds of johnsongrass allow the species to create new foci of infestation ('guerrilla' strategy), which finally merge with the main patch in a 'phalanx' strategy through rhizomes [45]. It seems that johnsongrass seeds disperse naturally over short distances (< 5 m) from the parent plants [44].…”

Section: Aggregation Analysismentioning

confidence: 99%

Spatial Analysis of Digital Imagery of Weeds in a Maize Crop

Martín

Milne

Webster

et al. 2018

IJGI

View full text Add to dashboard Cite

Abstract:Modern photographic imaging of agricultural crops can pin-point individual weeds, the patterns of which can be analyzed statistically to reveal how they are affected by variation in soil, by competition from other species and by agricultural operations. This contrasts with previous research on the patchiness of weeds that has generally used grid sampling and ignored processes operating at a fine scale. Nevertheless, an understanding of the interaction of biology, environment and management at all scales will be required to underpin robust precise control of weeds. We studied the spatial distributions of six common weed species in a maize field in central Spain. We obtained digital imagery of a rectangular plot 41.0 m by 10.5 m (= 430.5 m 2 ) and from it recorded the exact coordinates of every seedling: more than 82,000 individuals in all. We analyzed the resulting body of data using three techniques: an aggregation analysis of the punctual distributions, a geostatistical analysis of quadrat counts and wavelet analysis of quadrat counts. We found that all species were aggregated with average distances across patches ranging from 3 cm-18 cm. Species with small seeds tended to occur in larger patches than those with large seeds. Several species had aggregation patterns that repeated periodically at right angles to the direction of the crop rows. Wheel tracks favored some species (e.g., thornapple), whereas other species (e.g., johnsongrass) were denser elsewhere. Interactions between species at finer scales (<1 m) were negligible, although a negative correlation between thornapple and cocklebur was evident. We infer that the spatial distributions of weeds at the fine scales are products both of their biology and local environment caused by cultivation, with interactions between species playing a minor role. Spatial analysis of such high-resolution imagery can reveal patterns that are not immediately evident from sampling at coarser scales and aid our understanding of how and why weeds aggregate in patches.

show abstract

“…In continuous maize systems, S. halepense has been reported to reduce crop yields up to 100% through competition for light and other resources (Bendixen, ). Rapid growth from underground rhizomes, extensive production of rhizomes and prolific seed production contribute to rapid population growth, making S. halepense difficult to control (Ghosheh et al ., ; Andújar et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Response of Sorghum halepense demographic processes to plant density and rimsulfuron dose in maize

et al. 2016

Self Cite

View full text Add to dashboard Cite

In spatially heterogeneous weed infestations, variable dose technologies could be used to minimise herbicide use; high doses could be applied to reduce high-density patches and low doses to maintain weed populations in low-density portions of a field. To assess the potential short-and long-term effects of variable herbicide dose and site-specific management, the major weed demographic processes were described and parameterised in this study. Various doses of rimsulfuron (from 0 to 12.5 g a.i. ha À1 ) were applied to different densities of Sorghum halepense (0-100 plants m À2 ). Contrary to similar studies with other weed species, higher herbicide efficacy was not observed at low densities, suggesting that the same rimsulfuron dose should be applied regardless of the S. halepense density. The highest percentage of control was obtained with the full rimsulfuron dose. However, it did not guarantee a decrease of the infestation in the following season in the field areas where the initial S. halepense density was lower than 60 plants m À2 . Reduced doses of rimsulfuron to control S. halepense cannot be recommended based on our results.

show abstract

Spatial and temporal dynamics of Sorghum halepense patches in maize crops

Cited by 21 publications

References 29 publications

Combination of Herbicide Band Application and Inter-Row Cultivation Provides Sustainable Weed Control in Maize

Combination of Herbicide Band Application and Inter-Row Cultivation Provides Sustainable Weed Control in Maize

Spatial Analysis of Digital Imagery of Weeds in a Maize Crop

Response of Sorghum halepense demographic processes to plant density and rimsulfuron dose in maize

Contact Info

Product

Resources

About