Spatial and temporal stability of weed patches in cereal fields under direct drilling and harrow tillage
Izquierdo i Figarola, Jordi
Webster, R. (Richard)
MetadataShow full item record
The adoption of conservation agriculture (CA) techniques by farmers is changing the dynamics of weed communities in cereal fields and so potentially their spatial distribution. These changes can challenge the use of site-specific weed control, which is based on the accurate location of weed patches for spraying. We studied the effect of two types of CA (direct drilling and harrow-tilled to 20 cm) on weed patches in a three-year survey in four direct-drilled and three harrow-tilled commercial fields in Catalonia (North-eastern Spain). The area of the ground covered by weeds (hereafter called “weed cover”) was estimated at 96 to 122 points measured in each year in each field, in 50 cm × 50 cm quadrats placed in a 10 m × 10 m grid in spring. Bromus diandrus, Lolium rigidum, and Papaver rhoeas were the main weed species. The weed cover and degree of aggregation for all species varied both between and within fields, regardless of the kind of tillage. Under both forms of soil management all three were aggregated in elongated patterns in the direction of traffic. Bromus was generally more aggregated than Lolium, and both were more aggregated than Papaver. Patches were stable over time for only two harrow-tilled fields with Lolium and one direct-drilled field with Bromus, but not in the other fields. Spatial stability of the weeds was more pronounced in the direction of traffic. Herbicide applications, crop rotation, and traffic seem to affect weed populations strongly within fields, regardless of the soil management. We conclude that site-specific herbicides can be applied to control these species because they are aggregated, although the patches would have to be identified afresh in each season.
Is part ofAgronomy, 2020, vol. 10, núm. 4, article number 452
European research projects
Except where otherwise noted, this item's license is described as cc-by (c) Izquierdo i Figarola, Jordi et al., 2020
Showing items related by title, author, creator and subject.
Baraibar Padró, Bàrbara; Torra Farré, Joel; Royo-Esnal, Aritz; Recasens i Guinjuan, Jordi; Comas Rodríguez, Carles (Elsevier, 2018-09-17)Nest densities of harvester ants (Messor barbarus) are high in rain-fed cereal fields in north-eastern Spain where the ants remove large quantities of seeds, contributing to reductions in weed populations. The distribution ...
Baraibar Padró, Bàrbara; Canadell, Claudia; Torra Farré, Joel; Royo-Esnal, Aritz; Recasens i Guinjuan, Jordi (Weed Science Society of America, 2017)Maximizing weed seed exposure to seed predators by delaying post-harvest tillage has been suggested as a way to increase weed seed loss to predation in arable fields. However, in some areas of northeastern Spain, fields ...
Long-term effect of different tillage systems on the emergence and demography of Bromus diandrus in rainfed cereal fields Recasens i Guinjuan, Jordi; García, Addy Laura; Cantero-Martínez, Carlos; Torra Farré, Joel; Royo-Esnal, Aritz (European Weed Research Society, 2016)The adoption of no-tillage systems in semi-arid cereal fields in northern Europe has resulted in difficulties in controlling Bromus diandrus. However, in some fields, lower densities are observed in continuous long-term ...