Archaeobotanical reconstructions of field habitats and crops: the grange in Pomorzany near Kutno, 18th/19th c.

Abstract The paper presents the results of research of plant macrofossils from the grain deposit deriving from the 18th/19th centuries. The analysed material included 24760 diaspores representing 73 taxa. The majority were cultivated cereal crop species, and there was also abundance of accompanying segetal weed species. About 95% of the gathered crop material was Secale cereale. Another important crop was Hordeum vulgare and there were also some remains of Avena sativa, Triticum aestivum, Fagopyrum esculentum. Cannabis sativa and Linum usitatissimum were found as well. Weeds competing with these crops were, among others, the following species: Agrostemma githago, Raphanus raphanistrum, Apera spica-venti, Bromus secalinus, Centaurea cyanus, Spergula arvensis, Thlaspi arvense, Viola arvensis/tricolor, Fallopia convolvulus, Polygonum persicaria, Mentha arvensis, Anthemis arvensis, Papaver rhoeas, Rumex acetosella, Scleranthus annuus, Aphanes arvensis, Setaria pumila, Setaria viridis/verticilata. Extremely large presence of wild plant diaspores in the material allowed conducting economic and environmental interpretations. Reconstruction methods applied, used primarily in the case of macroremains from granaries, were fully applicable to the analysed plant residues. Weed species composition in the analysed material showed that they were mostly typical for the main winter crop. Some amount of species typical for other habitats were also found and they probably came from the near-by rye field. The presence of perennial diaspores indicated that the field was probably set aside

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Allelopathic potential of Artemisia herba-alba and Anthemis arvensis to control Weeds in Wheat (Triticum aestivum) and Barley (Hordeum vulgare)

South Asian Journal of Experimental Biology ◽

10.38150/sajeb.6(3).p95-100 ◽

2016 ◽

Vol 6 (3) ◽

pp. 95-100

Author(s):

Nadi Awwad Al Harbi

Keyword(s):

Triticum Aestivum ◽

Hordeum Vulgare ◽

Aqueous Extract ◽

Weed Management ◽

Allelopathic Effect ◽

Weed Species ◽

Crop Species ◽

Allelopathic Potential ◽

Anthemis Arvensis ◽

Germination And Growth

The aim of the present study was to investigate the potentials for utilization of Artemisia herba-alba and Anthemis arvensis shoot aqueous extract at different concentrations (1%, 3%, and 5%) to suppress the germination and growth of Panicum turgidum and Portulaca oleracea (weeds of crop fields) in Petri dish experiment. Results indicated that the degree of inhibition on seed germination and growth of the recipient species was largely dependent on the concentration of A. herba-alba and A.arvensis shoot aqueous extract. The aqueous extract of A.herba-alba showed the highest allelopathic effect on the germination of the seeds of P. turgidum, (10%,10% and 0%) while the effect of A. arvensis shoot aqueous extract was greater on the germination of the seeds P. oleracea (40%,0% and 0%). Percentage germination of the two selected crop species Triticum aestivum and Hordeum vulgare also de-creased as the A.herba-alba and A.arvensis shoot aqueous extract concentra-tion increased from 1% to 5% (90%,80% and 70%),(40%,40% and 20%). But the inhibition percentage was largely less than that of weed species. The results also showed that H.vulgare was more sensitive than T. aestivum and responds more strongly to the increase of concentration of A. herba-alba shoot aqueous extract . Results also showed that the radicle length of almost all tested species was more sensitive to allelochemicals from A.herba-alba and A.arvensis shoot aqueous extract than plumule length. Therefore, A. herba-alba and A. arvensis shoot aqueous extract may offer promises for their usefulness as a tool for weed management.

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EFFECTS OF TIME OF EMERGENCE, POPULATION DENSITY AND INTERSPECIFIC COMPETITION ON HEMP-NETTLE (Galeopsis tetrahit) SEED PRODUCTION

Canadian Journal of Plant Science ◽

10.4141/cjps89-020 ◽

1989 ◽

Vol 69 (1) ◽

pp. 185-194 ◽

Cited By ~ 4

Author(s):

ANNE LÉGÈRE ◽

JEAN-MARC DESCHÊNES

Keyword(s):

Population Density ◽

Interspecific Competition ◽

Seed Production ◽

Unit Area ◽

Initial Growth ◽

Weed Seed ◽

Weed Species ◽

Crop Species ◽

Thlaspi Arvense ◽

Delayed Emergence

Various conditions of intra- and interspecific competition may influence weed seed production thus affecting the extent of seed return to the soil. The objective of this study was to measure the effects of time of emergence, population density, and weed crop interaction on seed production of hemp-nettle (Galeopsis tetrahit) in natural field populations. Hemp-nettle seed production was studied in pure hemp-nettle stands, mixed hemp-nettle-stinkweed (Thlaspi arvense) stands, hemp-nettle-crop stands, and hemp-nettle-stinkweed-crop stands. Crop species used were alfalfa (Medicago sativa) and oats (Avena sativa). In pure hemp-nettle stands, delayed emergence and high population density reduced seed production of individual hemp-nettle plants. Hemp-nettle seed production per unit area was comparable for all but the lowest population density. Stink-weed population densities up to 200 plants m−2 had no consistent effect on average seed production of individual hemp-nettle plants. Seed production of individual plants was scarcely affected by the presence of alfalfa whereas it was largely reduced in the presence of the oat crop. Oats were usually more competitive than alfalfa, the latter crop being disadvantaged by slow initial growth. Hemp-nettle was not as prolific as other weed species but still produced enough seeds to reinfest the soil, even under highly competitive conditions.Key words: Hemp-nettle, Galeopsis tetrahit, seed production, weed reproduction

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The Effect of Different Soil Tillage Systems and Crop Residues on the Composition of Weed Communities

Agronomy ◽

10.3390/agronomy11071276 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1276

Author(s):

Vaida Steponavičienė ◽

Aušra Marcinkevičienė ◽

Lina Marija Butkevičienė ◽

Lina Skinulienė ◽

Vaclovas Bogužas

Keyword(s):

Soil Ph ◽

Crop Residues ◽

Soil Tillage ◽

Reduced Tillage ◽

Plant Residues ◽

No Tillage ◽

Agricultural Crops ◽

Weed Species ◽

Tillage Systems ◽

Weed Communities

The composition of weed communities in agricultural crops is dependent on soil properties and the applied agronomic practices. The current study determined the effect of different tillage systems and crop residue on the soil weed community composition. The research programme encompassed 2013–2015 in a long-term field experiment located in the Experimental Station of Vytautas Magnus University in Lithuania. The soil type in the experimental field was qualified as Endocalcaric Stagnosol (Aric, Drainic, Ruptic, Amphisiltic). Weeds were categorised into communities according to soil pH, nitrogen and moisture indicators. The results of investigations were grouped using cluster analysis. Agricultural crops were dominated by different weed species depending on the soil pH and moisture. Weed species were relatively more frequent indicating nitrogen-rich and very nitrogen-rich soils. In the reduced tillage and no-tillage systems, an increase in the abundance of weed species indicating moderate acidity and low acidity, moderately wet and wet, nitrogen-rich and very nitrogen-rich soils was observed. The application of plant residues decreased the weed species abundance. In the reduced tillage and no-tillage systems, the quantitative distribution of weed was often uneven. By evaluating the association of weed communities with groups of different tillage systems with or without plant residues, their control can be optimised.

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Diversity of weed species in wheat fields of district Rajouri, Jammu and Kashmir

Agricultural Science Digest - A Research Journal ◽

10.18805/ag.d-4382 ◽

2018 ◽

Author(s):

Amandeep Z. Singh ◽

Satvinder Singh ◽

L. R. Dangwal

Keyword(s):

Field Study ◽

Cannabis Sativa ◽

Maximum Density ◽

Avena Fatua ◽

Calotropis Procera ◽

Weed Species ◽

Rumex Acetosa ◽

Jammu And Kashmir ◽

Cropping Season ◽

Important Value Index

The present study was conducted to determine the diversity of weed species in wheat fields of the district Rajouri (JandK). For analyzing diversity 20 quadrats of (1m.×1m.) were randomly laid down in each block. In every set of quadrat frequency, density and abundance was observed throughout the cropping season and IVI (Important value index) was determined. During the course of field study it was reported that the maximum infestation was shown by grassy weed Avena fatua having maximum density (10.15, 12.12, 7.30, 9.35, 10.6, 8.55 from site 1-6 respectively) and IVI (35.71, 43.49, 30.27, 33.91, 32.59, 32.11 from site 1-6 respectively) in all the selected sites. While the least dominant weeds were Calotropis procera, Conyza japonica, Cannabis sativa, Rumex acetosa, Euphorbia prolifera and Sonchus asper etc. A total of 116 weed species belonging to 3 monocot and 27dicot families were reported from the target site.

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History of Identification of Herbicide-Resistant Weeds

Weed Technology ◽

10.1017/s0890037x00035910 ◽

1992 ◽

Vol 6 (3) ◽

pp. 615-620 ◽

Cited By ~ 42

Author(s):

Jodie S. Holt

Keyword(s):

Weed Control ◽

Herbicide Resistance ◽

Triazine Herbicides ◽

Mechanisms Of Resistance ◽

Weed Species ◽

Crop Species ◽

Herbicide Resistant ◽

History Of ◽

Successful Transfer

At least 57 weed species, including both dicots and monocots, have been reported to have biotypes selected for resistance to the triazine herbicides. In addition, at least 47 species have been reported to have biotypes resistant to one or more of 14 other herbicides or herbicide families. These herbicides include the aryloxyphenoxypropionics, bipyridiliums, dinitroanilines, phenoxys, substituted areas, and sulfonylureas, with two or more resistant biotypes each, as well as several other herbicides in which resistance is less well documented. Although evolved resistance presents a serious problem for chemical weed control, it has also offered new potential for transferring herbicide resistance to crop species. Mechanisms of resistance that are due to single or a few genes have become the focus of biotechnology, as the probability of their successful transfer to crop species is high.

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Interference of soybean and corn with Chloris distichophylla

Ciência e Agrotecnologia ◽

10.1590/s1413-70542013000400003 ◽

2013 ◽

Vol 37 (4) ◽

pp. 306-312 ◽

Cited By ~ 5

Author(s):

Alana Cristina Dorneles Wandscheer ◽

Mauro Antônio Rizzardi

Keyword(s):

Plant Height ◽

Dry Matter ◽

Total Density ◽

Weed Species ◽

Replacement Series ◽

Crop Season ◽

Crop Species ◽

Agricultural Ecosystems ◽

Corn Plants ◽

The University

In nature, plants interact with each other and establish positive, negative, and neutral interference relationships. In agricultural ecosystems, crops are usually affected by competition with weeds, and the effects of this process are influenced by the plant population density and proportional abundance and by the species involved. The present study evaluates the competitive interactions of soybean and corn with Chloris distichophylla. Two experiments were conducted in a greenhouse belonging to the University of Passo Fundo during the 2011/12 crop season: one experiment involving corn and C. distichophylla and another involving soybean and C. distichophylla. The experimental units were plastic pots, and the treatments were based on a replacement series, with a constant total density of eight plants per pot. The treatments included five combinations of soybean or corn plants with the weed species (8:0, 6:2, 4:4, 2:6 and 0:8), corresponding to relative abundances of 100, 75, 50, 25 and 0% of the crop species (and the reverse for the weed species). Competitiveness was analyzed using replacement-series experiment diagrams and competitive indices. Total dry matter and plant height were the two variables analyzed. The competitive indices indicated that corn and soybean crops were more competitive than the weed. The plant height was not affected by competition between both the species.

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Dioecious hemp (Cannabis sativa L.) plants do not express significant sexually dimorphic morphology in the seedling stage

Scientific Reports ◽

10.1038/s41598-021-96311-w ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Lesley G. Campbell ◽

Kristen Peach ◽

Sydney B. Wizenberg

Keyword(s):

Sexual Dimorphism ◽

Cannabis Sativa ◽

Research Effort ◽

Crop Improvement ◽

Seedling Stage ◽

Diagnostic Tools ◽

Phenotypic Traits ◽

Hypocotyl Length ◽

Crop Species ◽

Seedling Morphology

AbstractSome economically important crop species are dioecious, producing pollen and ovules on distinct, unisexual, individuals. On-the-spot diagnosis of sex is important to breeders and farmers for crop improvement and maximizing yield, yet diagnostic tools at the seedling stage are understudied and lack a scientific basis. Understanding sexual dimorphism in juvenile plants may provide key ecological, evolutionary and economic insights into dioecious plant species in addition to improving the process of crop cultivation. To address this gap in the literature, we asked: can we reliably differentiate males, females, and co-sexual individuals based on seedling morphology in Cannabis sativa, and do the traits used to distinguish sex at this stage vary between genotypes? To answer these questions, we collected data on phenotypic traits of 112 C. sativa plants (50 female, 52 male, 10 co-sexuals) from two hemp cultivars (CFX-1, CFX-2) during the second week of vegetative growth and used ANOVAs to compare morphology among sexes. We found males grew significantly longer hypocotyls than females by week 2, but this difference depended on the cultivar investigated. Preliminary evidence suggests that co-sexual plants may be distinguished from male and female plants using short hypocotyl length and seedling height, although this relationship requires more study since sample sizes of co-sexual plants were small. In one of the cultivars, two-week old male plants tend to produce longer hypocotyls than other plants, which may help to identify these plants prior to anthesis. We call for increased research effort on co-sexual plants, given their heavy economic cost in industrial contexts and rare mention in the literature. Our preliminary data suggests that short hypocotyl length may be an indicator of co-sexuality. These results are the first steps towards developing diagnostic tools for predicting sex using vegetative morphology in dioecious species and understanding how sexual dimorphism influences phenotype preceding sexual maturity.

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Relative Susceptibility Among Alternative Host Species Prevalent in the Great Plains to Wheat streak mosaic virus

Plant Disease ◽

10.1094/pdis-09-11-0746-re ◽

2012 ◽

Vol 96 (8) ◽

pp. 1185-1192 ◽

Cited By ~ 15

Author(s):

D. Ito ◽

Z. Miller ◽

F. Menalled ◽

M. Moffet ◽

M. Burrows

Keyword(s):

Mosaic Virus ◽

Great Plains ◽

Transmission Efficiency ◽

Wheat Streak Mosaic Virus ◽

Viral Reservoir ◽

Grass Species ◽

Mechanical Transmission ◽

Weed Species ◽

Crop Species ◽

Jointed Goatgrass

Wild grasses, crops, and grassy weeds are known to host Wheat streak mosaic virus (WSMV) and its vector, the wheat curl mite (WCM). Their relative importance as a source of WSMV was evaluated. A survey of small-grain fields throughout Montana was conducted between 2008 and 2009. Cheatgrass was the most prevalent grassy weed and the most frequent viral host, with 6% infection by WSMV in 2008 (n = 125) and 15% in 2009 (n = 358). By mechanically inoculating plants with WSMV in the greenhouse, the highest susceptibility was found in rye brome (52.1%), jointed goatgrass (80.9%), and wild oat (53.9%. Quackgrass, not previously reported as a host, was susceptible to WSMV (12.7%). Mite transmission efficiency from susceptible grass species was lower than from wheat, and grass species must be a host for both WSMV and the WCM to serve as a virus source. WCM transmission was more efficient than mechanical transmission. Overall, results indicate that grass species can serve as a viral reservoir, regional variation in a weed species' susceptibility to WSMV cannot explain geographic variation in epidemic intensity, and crop species and closely related weeds (e.g., jointed goatgrass) remain the best reservoirs for both WSMV and the WCM.

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First Report of Sclerotium rolfsii on Common Chickweed in North Carolina

Plant Disease ◽

10.1094/pdis.2004.88.4.426b ◽

2004 ◽

Vol 88 (4) ◽

pp. 426-426

Author(s):

J. E. Hollowell ◽

B. B. Shew

Keyword(s):

North Carolina ◽

Tap Water ◽

Sclerotium Rolfsii ◽

Control Treatment ◽

Fungal Mycelium ◽

Weed Species ◽

Stellaria Media ◽

Crop Species ◽

First Report ◽

Pure Cultures

Common chickweed (Stellaria media (L.) Cyrillo) is a common weed species found in agricultural fields of northeastern North Carolina. Symptomatic plants of common chickweed were observed during a March 2001 survey of winter annual weed species in Perquimans County, NC. The plants were growing in a harvested peanut field with a known history of southern stem rot caused by Sclerotium rolfsii Sacc. Water-soaked, bleached stems and chlorotic leaves were collected from plants and brought to the laboratory for isolation. Small portions (1 to 2 cm) of symptomatic stems and entire leaves were rinsed with tap water and placed on potato dextrose agar (PDA). Developing colonies were transferred to obtain pure cultures. The rapidly growing cultures had coarse, white mycelium typical of S. rolfsii and produced abundant, small, round, brown sclerotia approximately 2.0 mm in diameter on the surface of the culture. Clamp connections were observed with microscopic examination of mycelia. Pathogenicity of isolates was tested by placing 4-mm-diameter agar plugs of 2-day-old fungal mycelium on stems of three mature, nonsymptomatic chickweed plants. Agar plugs without fungal mycelium were used for the control treatment. Plugs were held in place with self-sticking bandage gauze. Plants were misted with water, enclosed in plastic bags, and incubated on a laboratory counter top at ambient temperature (24°C). Abundant mycelia developed, and water-soaked lesions and necrotic stems were observed. Noninoculated plants remained healthy and free of signs and symptoms during the incubation period. The fungus was reisolated on PDA, and pure cultures of S. rolfsii were obtained. Koch's postulates confirmed common chickweed was a host of S. rolfsii. To our knowledge, this is the first report of common chickweed as a host of S. rolfsii. Crop species commonly used in peanut rotations (corn, small grains, sorghum, and cotton) do not support populations of S. rolfsii. Many dicotyledonous weed species have been reported as hosts of S. rolfsii, but our observation of active disease on a winter weed species was unexpected. Colonization of winter weed, if prevalent, may enhance survival of S. rolfsii between crops of susceptible hosts such as peanut.

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MANAGEMENT OF COVER CROPS FOR WEED CONTROL BETWEEN PLASTIC MULCH IN PEPPERS (CAPSICUM ANNUUM)

HortScience ◽

10.21273/hortsci.28.4.257e ◽

1993 ◽

Vol 28 (4) ◽

pp. 257E-257

Author(s):

Francis X. Mangan ◽

Mary Jane Else ◽

Stephen J. Herbert

Keyword(s):

White Clover ◽

Cover Crops ◽

Cover Crop ◽

Lolium Multiflorum ◽

Field Research ◽

Soil Surface ◽

Winter Rye ◽

Weed Species ◽

Plastic Mulch ◽

Crop Species

Field research was conducted in Deerfield, Mass. to study the effects of different cover crop species seeded between plastic mulch on weed pressure and pepper yield. A complete fertilizer was applied before plastic was laid on Sept. 13, 1991. Two cover crop treatments were seeded Sept. 13, 1991: white clover (Trifolium repens) alone and hairy vetch (Vicia villosa) in combination with winter rye (Secale cereale). On May 27, 1992 the vetch and rye were mow-killed with the biomass left on the soil surface. Annual rye (Lolium multiflorum) was then seeded on the same day as the third cover crop treatment. The remaining two treatments were a weedy check and a hand-weeded check. Peppers were transplanted into the plastic on May 31. Both the annual rye and clover were mowed three times over the course of the experiment with the biomass left between the plastic mulch. The white clover and annual rye were much more competitive with weed species than the dead mulch of vetch and rye. The three cover crop treatments had pepper yields that were severely depressed compared to the hand-weeded treatment. Among the three cover crop treatments, only the annual rye yielded more peppers than the weedy check.

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