Phytosociological Survey of Sugarcane Crop Weeds in Different Agroecological Areas in Tucumán Province, Argentina

Cabrera, D.C.; Chaila, S.; Sobrero, M. T.; Varela, Alejandro

doi:10.1590/s0100-83582019370100027

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…(1) Means followed by equal letter, lowercase in the columns and capital letters in the lines, do not differ by Tukey's test at 5% of probability. sensitive to infrequent species, whereas the Simpson's index accounts for numerous species more efficiently (Cabrera et al, 2019). The similarity index between crop systems was high in April 2010, with values higher than 0.66, regardless whether they were intercropped or single crops (Figure 3).…”

Section: Resultsmentioning

confidence: 99%

Weed infestations in soybean grown in succession to cropping systems with sorghum and cover plants

Filho¹,

Carmona

Marchão

et al. 2020

Pesq. agropec. bras.

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The objective of this work was to evaluate the influence of sorghum and cover plant cropping systems before soybean cultivation on the occurrence of weeds during soybean growing in the Brazilian Cerrado. The experiment was carried out in a randomized complete block design, with four replicates. The treatments comprised six cropping systems before soybean: sorghum (Sorghum bicolor), palisade grass (Urochloa brizantha), and Congo grass (Urochloa ruziziensis) as cover plants, alone or intercropped, in addition to fallowing. Weeds were evaluated as to: density, dry matter mass, diversity, importance value, and similarity. The greatest similarity of weeds ocurred in single crops of sorghum, palisade grass, and Congo grass, in comparison with their intercroppings. Congo grass before soybean promoted a greater reduction in weed diversity overtime, when compared with palisade grass. The absence of cover crops before soybean cultivation increased weed infestation during the soybean cycle. The cropping systems with sorghum intercropped with cover crops before the soybean cultivation affect the diversity and the importance value of weed species.

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Section: Resultsmentioning

confidence: 99%

Weed infestations in soybean grown in succession to cropping systems with sorghum and cover plants

Filho¹,

Carmona

Marchão

et al. 2020

Pesq. agropec. bras.

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“…The IVI was computed using standard formula of absolute frequency, relative frequency, absolute density, relative density, absolute abundance and relative abundance.

Absolute density (AD) goodbreak= \frac{Total number of individuals across normalall sampling units}{normalSum of normalall area sampled}

Importance value index ((), IVI) goodbreak= Relative frequency goodbreak+ Relative density goodbreak+ Relative abundance

The IVI can range from 0 to 300. A high IVI of a specific species in a given management indicates that species is well represented because of a large number of individuals compared with other species (Cabrera et al, 2019; Mueller‐Dombois & Ellenberg, 1974). The weed diversity indices such as evenness index, richness index and ecological dominance were calculated as described by Nkoa et al (2015), Nandan et al (2018) and Nath et al (2021).…”

Section: Methodsmentioning

confidence: 99%

Weed seedbank, above‐ground weed community and crop yields under conventional and conservation agriculture practices in maize–wheat–mungbean rotation

et al. 2023

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Weeds are the major biological barriers to achieving higher yields in agro‐ecosystem. We aimed to determine weed community (seedbank and aboveground) and crop yield responses to conventional tillage (CT) and different types of conservation agriculture (CA) practices with variable nitrogen (N) doses in a maize (Zea mays L.)–wheat (Triticum aestivum L.)–mungbean (Vigna radiata L.) rotation. After 8 years of implementation, CA practices including zero‐tilled (ZT) permanent narrow‐bed with crop residues and 100% required N (PNB + R + 100 N), and ZT permanent broad‐bed with residues and 100% required N (PBB + R + 100 N) had a lower weed seed density by 45% at 0–7.5 cm and 53% at 7.5–15 cm soil layers than CT. CT promoted dominance of Cyperus rotundus L., Cyperus esculentus L. and Dinebra retroflexa (Vahl) Panz. while, specific CA practices (PNB + R + 100 N and PBB + R + 100 N) promoted dominance of Digera arvensis Forsk. and Melilotus indicus (L.). Compared to PNB + R + 100 N and PBB + R + 100 N, CT seedbanks had 41–46% higher ecological dominance, which is an indicator that delineates dominance of few specific weed species. The PBB + R + 100 N also had a lower total above‐ground weed density in maize–wheat–mungbean rotation by 34% (mean of years) than CT. The PBB + R + 100 N had 31.1% higher system productivity over CT. Thus, PBB + R + 100 N could reduce the weed seed density in the soil and above‐ground weeds and increase crop yields for sustainable crop production in maize–wheat–mungbean rotations.

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“…The plants in the sample plots were collected by cutting their shoots, separated by species, placed in kraft paper bags, and dried in an oven at 70 °C for 72 hours to determine their dry biomass (CABRERA et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

“…The data collected were subjected to weed community analysis using phytosociological parameters, which show the absolute and relative values of weed frequency, density, abundance, and importance value index, through the formulas proposed by Mueller-Dombois and Ellemberg (1974) and described by Cabrera et al (2019). In addition, the coefficient of Sorensen (1972) was used to determine the similarity between the areas evaluated (properties).…”

Section: Methodsmentioning

confidence: 99%

Weed Phytosociology and Distribution in Vineyards in the São Francisco River Valley

et al. 2021

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Information on the different species that compose a weed community is essential for plant protection managements in production systems, which should include not only flora identification and diversity assessments, but morphological and ecophysiological aspects that can to show the potential effect of the agrosystem and guide the conduction of weed control strategies. Therefore, the objective of this work was to conduct a floristic and phytosociological surveying to identify the grouping patterns of weed populations in vineyards in the Petrolina-Juazeiro irrigated perimeter, in the Sub-Mid São Francisco River Valley, Brazil. The absolute and relative values of weed frequency, density, abundance, importance value index, population distribution level, and similarity between areas were evaluated in five properties. A high diversity of species of the families Poaceae, Malvaceae, and Asteraceae were found. The most important species found were Commelina benghalensis, Euphorbia hirta, and Cyperus aggregatus. The distribution of populations was mainly in aggregate and highly aggregate forms.

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Phytosociological Survey of Sugarcane Crop Weeds in Different Agroecological Areas in Tucumán Province, Argentina

Cited by 6 publications

References 2 publications

Weed infestations in soybean grown in succession to cropping systems with sorghum and cover plants

Weed infestations in soybean grown in succession to cropping systems with sorghum and cover plants

Weed seedbank, above‐ground weed community and crop yields under conventional and conservation agriculture practices in maize–wheat–mungbean rotation

Weed Phytosociology and Distribution in Vineyards in the São Francisco River Valley

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