Yellow and purple nutsedges survey in the southeastern Buenos Aires Province, Argentina

A survey of 79 fields was conducted between December 1993 and January 1994, to determine the distribution and relative importance of species of the genus Cyperus, to justify developing management strategies in the southeastern of Buenos Aires Province, Argentina. Yellow and purple nutsedge were found in 43% and 9% respectively of the surveyed fields. Thirty eight per cent of the surveyed area showed a heavy infestation of yellow nutsedge, and in 90% of cases yellow nutsedge was invading fields cultivated with summer crops and associated with one or more of other seven perennial weeds, mainly bermudagrass.

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Temperature Thresholds for Bud Sprouting in Perennial Weeds and Seed Germination in Cotton

Weed Science ◽

10.1017/s0043174500094285 ◽

1996 ◽

Vol 44 (3) ◽

pp. 523-533 ◽

Cited By ~ 29

Author(s):

Jodie S. Holt ◽

Deborah R. Orcutt

Keyword(s):

Seed Germination ◽

Low Temperature ◽

Temperature Threshold ◽

Median Response ◽

Purple Nutsedge ◽

Yellow Nutsedge ◽

Seed Biology ◽

Perennial Weeds ◽

Bud Sprouting ◽

Temperature Thresholds

Experiments were conducted to establish low temperature thresholds for initiation of bud sprouting in dormant vegetative propagules of johnsongrass, purple nutsedge, and yellow nutsedge, and seed germination in cotton. Weed propagule sprouting and cotton seed germination responses to temperature were determined in a series of experiments conducted on a temperature gradient bar. Four calculated indices were used to quantify germination: mean percent germination per day, reciprocal median response time, and two versions of germination rate index. Data were analyzed as a series of regressions of germination indices against temperature. Maximum and minimum temperatures for germination were derived directly from the regressions and compared among species. Yellow nutsedge had the lowest temperature threshold (6 C), while the other species had low temperature thresholds of 11 to 12 C. Upper temperature thresholds were similar among species and ranged from 42 to 44 C. The lower low temperature threshold of yellow nutsedge sprouting compared to those for cotton, johnsongrass, and purple nutsedge suggests that early establishment by yellow nutsedge is an important factor in competitiveness in mixtures of these species. The results presented here suggest that application of principles derived from studies in seed biology might advance our understanding and ability to manage perennial weeds.

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Functional Relationships of Growth and Competitiveness in Perennial Weeds and Cotton (Gossypium hirsutum)

Weed Science ◽

10.1017/s0043174500088408 ◽

1991 ◽

Vol 39 (4) ◽

pp. 575-584 ◽

Cited By ~ 37

Author(s):

Jodie S. Holt ◽

Deborah R. Orcutt

Keyword(s):

Growth Rate ◽

Production Efficiency ◽

Correlation Coefficients ◽

Stepwise Multiple Regression ◽

Research Station ◽

Purple Nutsedge ◽

Yellow Nutsedge ◽

Functional Relationships ◽

Unit Leaf ◽

Perennial Weeds

Growth characteristics and competitive relationships of cotton and three perennial weeds (johnsongrass, purple nutsedge, and yellow nutsedge) were investigated at the USDA Cotton Research Station in Shafter, CA. In growth analysis experiments, yellow nutsedge and johnsongrass had highest values for height, biomass, leaf area production, growth rate, and photosynthetic efficiency. The weeds exhibited greater overall resource use and production efficiency than cotton, while cotton attained greater leafiness and canopy closure than weeds over the 10-wk experiment. Linear correlation indicated that most growth variables were significantly correlated with aggressivity (competitiveness); however, all correlation coefficients were less than 0.80. Stepwise multiple regression, using aggressivity as the dependent variable, defined 4 growth variables out of 12 that best described competitiveness. These were unit leaf rate (ULR), height, relative growth rate (RGR), and initial propagule weight (PWT). Thus, parameters of light utilization (ULR, height) and early establishment (RGR, PWT) were best predictors of competitive success in this system.

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Changes in Weed Communities of Spring Wheat Crops of Buenos Aires Province of Argentina

Weed Science ◽

10.1614/ws-d-12-00141.1 ◽

2014 ◽

Vol 62 (1) ◽

pp. 51-62 ◽

Cited By ~ 17

Author(s):

Julio A. Scursoni ◽

Ramón Gigón ◽

Andrés N. Martín ◽

Mario Vigna ◽

Eduardo S. Leguizamón ◽

...

Keyword(s):

Native Species ◽

Buenos Aires ◽

Landscape Heterogeneity ◽

Management Strategies ◽

Conventional Tillage ◽

Italian Ryegrass ◽

Community Diversity ◽

Buenos Aires Province ◽

Yellow Starthistle ◽

Weed Communities

During 2004 to 2008, weed surveys were conducted in 373 wheat fields of two different cropped areas (southwest [SW] and southeast [SE]) of the southern region of Buenos Aires Province of Argentina where different weed communities were expected because of changes in cropping practices over time, including tillage, crop sequence, fertilizers, and herbicides applied. Weed communities differed between regions, with greater numbers of native species for the SW. Weed community diversity was also greater for the SW region, probably due to the more diverse land use that resulted in greater landscape heterogeneity. Rush skeletonweed, sand rocket, yellow starthistle and turnipseed occurred at higher constancy (proportion of fields in which a given species is present) in the SW region, whereas common chickweed, false bishop's weed, corn speedwell, and common lambsquarters were present more frequently in the SE region. Compared with the 1982 survey, constancy of weeds increased, but those species with high constancy in 1982 were also with high constancy in the recent surveys. Diversity (species richness) was greater in conventional than in a no-tillage system. The constancy of Italian ryegrass, sand rocket, and yellow starthistle was lower under no-till than conventional tillage. Surveys allow identification of changes in weed community related to different agricultural systems. Rotation of crops and livestock avoid the homogenization of the environment at the landscape level. Management strategies will be necessary to prevent the increase of weeds populations' size, preserving plant diversity and the properties of the agroecosystem.

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Biology and Life Cycle of Purple and Yellow Nutsedges (Cyperus rotundusandC. esculentus)

Weed Technology ◽

10.1017/s0890037x0002916x ◽

1987 ◽

Vol 1 (1) ◽

pp. 66-73 ◽

Cited By ~ 67

Author(s):

E. W. Stoller ◽

R. D. Sweet

Keyword(s):

Crop Production ◽

Crop Yields ◽

Cyperus Esculentus ◽

Purple Nutsedge ◽

Yellow Nutsedge ◽

Perennial Weeds ◽

Local Environments ◽

Extended Range ◽

Production Areas ◽

Herbaceous Perennial

Yellow and purple nutsedges (Cyperus esculentusL. # CYPES andC. rotundusL. # CYPRO) are herbaceous perennial weeds that are among the worst pests known. Holm et al. list purple nutsedge as the world's worst weed and yellow nutsedge as the sixteenth worst weed. Both weeds infest crop production areas in tropical and temperate climates, causing large losses in crop yields. While both species proliferate in the warm regions of the world, yellow nutsedge inhabits a wider range than purple nutsedge in the temperate areas, primarily because yellow nutsedge can tolerate colder temperatures. With such an extended range of habitation, many ecotypic variations of these species would be expected since they likely have adjusted to a multitude of local environments.

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Lichens found on the bridge "La Postrera" across the Salado river, Cháscomús (Buenos Aires Province, Argentina)

RILEM International Conference on Microbial Impact on Building Materials ◽

10.1617/2351580184.008 ◽

2003 ◽

Author(s):

V. G. Rosato

Keyword(s):

Buenos Aires ◽

Buenos Aires Province ◽

Salado River

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Finding of an Upper Pleistocene-Lower Holocene fecal fossil remain at General Guido Department, Buenos Aires province, Argentina

Revista del Museo Argentino de Ciencias Naturales ◽

10.22179/revmacn.10.280 ◽

2008 ◽

pp. 239-254 ◽

Cited By ~ 4

Author(s):

Nicolás Chimento ◽

Luciano Rey

Keyword(s):

Buenos Aires ◽

Buenos Aires Province ◽

Upper Pleistocene

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Occurrence of Cryptosporidium and other enteropathogens and their association with diarrhea in dairy calves of Buenos Aires province, Argentina

Veterinary Parasitology Regional Studies and Reports ◽

10.1016/j.vprsr.2021.100567 ◽

2021 ◽

Vol 24 ◽

pp. 100567

Author(s):

Carlos J. Garro ◽

Gabriel E. Morici ◽

Mariela L. Tomazic ◽

Daniel Vilte ◽

Micaela Encinas ◽

...

Keyword(s):

Buenos Aires ◽

Dairy Calves ◽

Buenos Aires Province

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Water Footprint and Virtual Water Trade of Maize in the Province of Buenos Aires, Argentina

Water ◽

10.3390/w13131769 ◽

2021 ◽

Vol 13 (13) ◽

pp. 1769

Author(s):

Maria Macarena Arrien ◽

Maite M. Aldaya ◽

Corina Iris Rodriguez

Keyword(s):

Buenos Aires ◽

Water Footprint ◽

Local Level ◽

Virtual Water ◽

Buenos Aires Province ◽

Pollution Load ◽

Basin Scale ◽

Water Volumes ◽

Water Scarce ◽

First Time

Agriculture is the largest fresh water consuming sector, and maize is the most produced and consumed crop worldwide. The water footprint (WF) methodology quantifies and evaluates the water volumes consumed and polluted by a given crop, as well as its impacts. In this work, we quantified for the first time the green WF (soil water from precipitation that is evapotranspired) and the green virtual water exports of maize from Buenos Aires province, Argentina, during 2016–2017, due to the relevance of this region in the world maize trade. Furthermore, at local level, we quantified the green, blue (evapotranspired irrigation), and grey (volume of water needed to assimilate a pollution load) WF of maize in a pilot basin. The green WF of maize in the province of Buenos Aires ranged between 170 and 730 m3/ton, with the highest values in the south following a pattern of yields. The contribution of this province in terms of green virtual water to the international maize trade reached 2213 hm3/year, allowing some water-scarce nations to ensure water and water-dependent food security and avoid further environmental impacts related to water. At the Napaleofú basin scale, the total WF of rainfed maize was 358 m3/ton (89% green and 11% grey) and 388 m3/ton (58% green, 25% blue, and 17% grey) for the irrigated crop, showing that there is not only a green WF behind the exported maize, but also a Nitrogen-related grey WF.

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