Impact of Cover Crop Management on Level of Weed Suppression: A Meta‐Analysis

Osipitan, O. Adewale; Dille, J. Anita; Assefa, Yared; Radicetti, Emanuele; Ayeni, A.O.; Knežević, Stevan Z.

doi:10.2135/cropsci2018.09.0589

Cited by 125 publications

(120 citation statements)

References 53 publications

(129 reference statements)

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“…Generation of dynamic spatial and temporal diverse agroecological conditions are possible through the implementation of management practices, such as the use of grazed and ungrazed pasture phases [86], cover crops [87], choice of competitive cultivars [88], changes in cultural practices such as seeding and harvest time, crop row spacing, density and orientation [89], implementation of soil tillage [83], and management of fence lines and field margins [90], just to mention a few. These diverse agroecological conditions imply environmental changes in fluctuating temperatures and light intensity and quality (red/far red ratio) at soil levels and under crop canopies and demand of plant resources together, which in turn may bring changes in soil chemical and physical properties.…”

Section: Implications Of Fitness Costs To Resistance Managementmentioning

confidence: 99%

Fitness of Herbicide-Resistant Weeds: Current Knowledge and Implications for Management

Vila‐Aiub

2019

Plants

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Herbicide resistance is the ultimate evidence of the extraordinary capacity of weeds to evolve under stressful conditions. Despite the extraordinary plant fitness advantage endowed by herbicide resistance mutations in agroecosystems under herbicide selection, resistance mutations are predicted to exhibit an adaptation cost (i.e., fitness cost), relative to the susceptible wild-type, in herbicide untreated conditions. Fitness costs associated with herbicide resistance mutations are not universal and their expression depends on the particular mutation, genetic background, dominance of the fitness cost, and environmental conditions. The detrimental effects of herbicide resistance mutations on plant fitness may arise as a direct impact on fitness-related traits and/or coevolution with changes in other life history traits that ultimately may lead to fitness costs under particular ecological conditions. This brings the idea that a “lower adaptive value” of herbicide resistance mutations represents an opportunity for the design of resistance management practices that could minimize the evolution of herbicide resistance. It is evident that the challenge for weed management practices aiming to control, minimize, or even reverse the frequency of resistance mutations in the agricultural landscape is to “create” those agroecological conditions that could expose, exploit, and exacerbate those life history and/or fitness traits affecting the evolution of herbicide resistance mutations. Ideally, resistance management should implement a wide range of cultural practices leading to environmentally mediated fitness costs associated with herbicide resistance mutations.

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Section: Implications Of Fitness Costs To Resistance Managementmentioning

confidence: 99%

Fitness of Herbicide-Resistant Weeds: Current Knowledge and Implications for Management

Vila‐Aiub

2019

Plants

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“…In NT dryland systems, CC biomass production varies greatly because of variable precipitation amount, crop rotation, CC species, planting time, seeding rate, and soil type. In a recent meta-analysis, Osipitan et al (2019) showed that CC management decisions, including selection of CC species, planting season, planting date, seeding rate, termination date, delay in main crop planting after termination of CCs, and tillage system, all can influence the effective use of CCs for weed suppression. Here, we briefly review major agronomic practices and challenges in growing CCs for weed suppression in NT semiarid regions of the U.S. Great Plains.…”

Section: Agronomic Considerations For Integrating Cover Crops In No-tmentioning

confidence: 99%

Integrating cover crops for weed management in the semiarid U.S. Great Plains: opportunities and challenges

et al. 2020

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The widespread evolution of herbicide resistance in weed populations has become an increasing concern for no-tillage (NT) growers in semiarid regions of the U.S. Great Plains. Lack of cost-effective and alternative new herbicide sites of action further exacerbates the problem of herbicide-resistant (HR) weeds and threatens the long-term sustainability of prevailing cropping systems in the region. A recent decline in commodity prices and increasing herbicide costs to manage HR weeds has spurred research efforts to build a strong rationale for developing ecologically based integrated weed management (IWM) strategies in the U.S. Great Plains. Integration of cover crops (CCs) in NT dryland production systems potentially offers several ecosystem services, including weed control, soil health improvement, decline in selective pest pressure, and overall reduction in pest management inputs. This review article aims to document the role of CCs for IWM, with emphasis on exploring emerging weed issues; ecological, economic, and agronomic benefits of growing CCs; and constraints preventing adoption of CCs in NT cropping systems in the semiarid Great Plains. We attempt to focus on changes in weed management practices, their long-term impacts on weed seedbanks, weed shifts, and herbicide-resistance evolution in the most common weed species in the region. We also highlight current knowledge gaps and propose new research priorities based on an improved understanding of CC management strategies that will ultimately aid in achieving sustainable weed management goals and preserving natural resources in water-limited environments.

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“…Therefore, some agronomical practices, such as agro-ecological service crops and soil tillage, that generally have a great impact on weed establishment and growth [5,6] must be evaluated in relation to quinoa cultivation. In fact, the combination of agro-ecological service crops and the arrangement of their residues could determine different levels of weed responses based on the qualitative and quantitative characteristics of the agro-ecological service crop residues and the type of soil tillage adopted [7]. The information obtained from such studies could support farmers in the decision process focused on a suitable approach to manage weeds in quinoa crops.…”

Section: Introductionmentioning

confidence: 99%

How Do Intensification Practices Affect Weed Management and Yield in Quinoa (Chenopodium quinoa Willd) Crop?

2020

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Quinoa cultivation is well-adapted to sustainable cropping systems, even if seed yield could be severely limited due to several constraints, such as weeds. Field trials were performed in Gorgan (Iran) to quantify the effects of agro-ecological service crops (rye, CCr; winter vetch, CCw; and no cover, CC0), tillage regimes (conventional tillage, CT; and no-tillage, ZT), and herbicide rates (100% rate, H100; 75% rate, H75; and without herbicide, H0). Weed characteristics and quinoa yield were measured. Quinoa seed yield was the highest in CCw-ZT-H100. Seed yield in H100 and H75 were higher compared with H0 (2.30 vs. 1.58 t ha−1, respectively). Under conventional tillage, 46% of weed seeds were observed in the 0–10 cm soil layer and 54% in 10–20 cm soil layers, respectively, while, under no-tillage, about 63% of weed seeds were located up to 10 cm of soil. Amaranthus retroflexus L. was the most abundant species. The total weed density was the lowest in CCr-ZT-H100 and tended to be higher in CC0 (30.9 plant m−2) and under CT (29.0 plant m−2). These findings indicate that cover crops have potential for managing weeds in quinoa; however, their inclusion should be supported by chemical means to maintain high seed.

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Impact of Cover Crop Management on Level of Weed Suppression: A Meta‐Analysis

Cited by 125 publications

References 53 publications

Fitness of Herbicide-Resistant Weeds: Current Knowledge and Implications for Management

Fitness of Herbicide-Resistant Weeds: Current Knowledge and Implications for Management

Integrating cover crops for weed management in the semiarid U.S. Great Plains: opportunities and challenges

How Do Intensification Practices Affect Weed Management and Yield in Quinoa (Chenopodium quinoa Willd) Crop?

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