Chemical Composition of Weeds and Accompanying Crop Plants<sup>1</sup>

Vengris, Jonas; Drake, Mack; Colby, W. G.; Bart, Joseph

doi:10.2134/agronj1953.00021962004500050009x

Cited by 62 publications

(42 citation statements)

References 3 publications

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“…In weedy treatments, 37.5 kg N, 11.6 kg P and 38.3 kg K/ha were depleted in comparison to full-season weed-free conditions. The results are in conformity with the findings of Vengris et al, (1953), who reported vigorous growth and higher biomass of weeds resulted in more nutrient depletion.…”

Section: Nitrogen Uptake By Crop and Weedssupporting

confidence: 92%

Pre and Post Emergence Application of Imazthapyr on N Uptake, Nodulation and Microbial Population of Chickpea Sown after Rice in Vertisols of C. G.

Ahmad¹,

Chowdhury²,

Taunk³

et al. 2017

Int.J.Curr.Microbiol.App.Sci

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Section: Nitrogen Uptake By Crop and Weedssupporting

confidence: 92%

Pre and Post Emergence Application of Imazthapyr on N Uptake, Nodulation and Microbial Population of Chickpea Sown after Rice in Vertisols of C. G.

Ahmad¹,

Chowdhury²,

Taunk³

et al. 2017

Int.J.Curr.Microbiol.App.Sci

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“…In general weeds have more aggressive nutrient uptake compared to crops (Vengris et al, 1953), therefore altering timing, placement, and source in order to preferentially provide the crop with better access to nutrients is desirable. In soils with low background levels of fertility, banding of fertilizers can reduce weed biomass compared to broadcasting, with deep banding being more effective than surface banding (Di Tomaso, 1995;Liebman and Mohler, 2001;Derksen et al, 2002).…”

Section: Spatial Arrangement Of the Cropmentioning

confidence: 99%

Weed dynamics and conservation agriculture principles: A review

Nichols

Verhulst

Cox

et al. 2015

Field Crops Research

332

299

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a b s t r a c tConservation agriculture (CA) is based on minimum soil disturbance, permanent soil cover, and crop rotation; it is promoted as a sustainable alternative to systems involving conventional tillage. Adoption of CA changes weed dynamics and communities and therefore necessitates adjusting weed control methods. The objectives of this review are to summarize literature concerning CA principles and their interactive effects on weed life cycles and community composition, briefly review CA-appropriate cultural practices for additional weed control, and identify areas where further research is needed. No-till systems accumulate seeds near the soil surface where they are more likely to germinate but are also exposed to greater mortality risks through weather variability and predation. Assuming no seed input into the system, germinable seedbanks under no-till decrease more rapidly than under conventional tillage. Reducing tillage may shift weed communities from annual dicots to grassy annuals and perennials. Surface residues lower average soil temperatures and may delay emergence of both crops and weeds. Germination and growth of small-seeded annuals will suffer from restricted light availability, physical growth barriers and potential allelopathic effects from surface residue. Crop rotation affects weeds via allelopathy and altered timing of both crop management and resource demands. Rotations should incorporate crops sown in varied seasons (e.g., autumn and spring), annuals and perennials, different herbicides, and/or various crop families. Literature indicates implementing no-till without crop rotation can result in severe weed problems; greater rotational crop diversity results in easier weed management. Additional cultural practices for CA include: (i) selecting highly competitive varieties; (ii) altering planting dates; (iii) preventing weed seed recruitment; (iv) adjusting planting arrangement, densities, and fertilizer placement; and (v) microbial bio-controls. Further research is needed concerning: (i) the interactive effects of tillage and surface residue on weeds; (ii) the use of models and/or meta-analyses to predict weed responses, and to identify intervention points in CA; and (iii) the weed-suppressive potential of longer (4+ years) rotations.

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“…Le chénopode est une plante qui consomme beaucoup d'éléments nutritifs, plus particulièrement l'azote, le potassium, le calcium, le magnésium et le fer (Ervio 1971;Shahi 1978;Vengris et al 1955). D'après Malicki et Berbeciowa (1986), les contenus en N, P, K, Ca, Mg et Na sont plus élevés dans le chénopode que dans le blé, ce qui en fait un fort compétiteur pour les éléments nutritifs.…”

Section: Résultats Et Discussionunclassified

Effet de la dose de semis et de l’écartement entre les rangs sur l’interférence entre le Chenopodium album et le Triticum aestivum

Pageau¹,

Tremblay²

2005

phyto

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Un essai répété 4 années a permis d'évaluer l'effet de la présence du chénopode (Chenopodium album) sur la productivité du blé (Triticum aestivum 'Max'). La céréale a été ensemencée à cinq doses de semis (100, 200,300, 400 et 500 grains viables m-2) et à deux écartements entre les rangs (10 et 18 cm). Une réduction de l'écartement entre les rangs a permis d'accroître les rendements en blé de 16 % en présence ou non du chénopode. La dose de semis est un facteur plus important que l'écartement entre les rangs. À une dose de semis de 100 grains m-2, la présence du chénopode a causé une réduction du rendement en grain de 23 % tandis que cette réduction était de 11 % avec une dose de semis de 500 grains m-2. La baisse de rendement en blé provoquée par la présence de chénopode est surtout attribuable à une réduction du nombre d'épis par unité de surface. Le chénopode a également réduit le nombre d'épis par plant et le nombre de grains par épi tandis que le poids de 1000 grains et l'indice de récolte ont été peu affectés. Les contenus en azote et en phosphore du grain de blé ont été réduits par la présence du chénopode. Une réduction de l'écartement entre les rangs ou une augmentation de la dose de semis du blé n'a pas permis de réduire le nombre de plants mais a réduit la biomasse du chénopode.

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Chemical Composition of Weeds and Accompanying Crop Plants¹

Abstract: EED control is one of the most important and expenw s i v e operations in crop production. Basic information about weeds is important to the research worker as well as to the practical farmer.

Cited by 62 publications

References 3 publications

Pre and Post Emergence Application of Imazthapyr on N Uptake, Nodulation and Microbial Population of Chickpea Sown after Rice in Vertisols of C. G.

Pre and Post Emergence Application of Imazthapyr on N Uptake, Nodulation and Microbial Population of Chickpea Sown after Rice in Vertisols of C. G.

Weed dynamics and conservation agriculture principles: A review

Effet de la dose de semis et de l’écartement entre les rangs sur l’interférence entre le Chenopodium album et le Triticum aestivum

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Chemical Composition of Weeds and Accompanying Crop Plants1

Abstract: EED control is one of the most important and expenw s i v e operations in crop production. Basic information about weeds is important to the research worker as well as to the practical farmer.

Cited by 62 publications

References 3 publications

Pre and Post Emergence Application of Imazthapyr on N Uptake, Nodulation and Microbial Population of Chickpea Sown after Rice in Vertisols of C. G.

Pre and Post Emergence Application of Imazthapyr on N Uptake, Nodulation and Microbial Population of Chickpea Sown after Rice in Vertisols of C. G.

Weed dynamics and conservation agriculture principles: A review

Effet de la dose de semis et de l’écartement entre les rangs sur l’interférence entre le Chenopodium album et le Triticum aestivum

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Resources

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Chemical Composition of Weeds and Accompanying Crop Plants¹