scholarly journals Phytosociology in Degraded and Renewed Pastures in Agrosilvopastoral Systems

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
R.C. DIAS ◽  
M.V. SANTOS ◽  
E.A. FERREIRA ◽  
T.G.S BRAZ ◽  
L.V. FIGUEIREDO ◽  
...  
Keyword(s):  
Similarity Index ◽  
Weed Species ◽  
Importance Value Index ◽  
Importance Value ◽  
Brachiaria Decumbens ◽  
Agrosilvopastoral Systems ◽  
Before And After ◽  
One Year ◽  
Sida Cordifolia

ABSTRACT: In pastures, the incidence of weeds reduces the productivity and quality of forage. The identification of the weed species in pastures is fundamental to choose the renewal method. Thus, the objective of this work was to perform phytosociology before and after the renewal of a Brachiaria decumbens pasture, with the implantation of agrosilvopastoral systems. Eighteen different crop arrangements for pasture renewal were evaluated. The renewal systems were by eucalyptus integration (at 12 x 2 m or 12 x 3 m spacings) with maize, Brachiaria brizantha cv. Marandu (palisade grass) and/or Macrotyloma axillare (perennial horsegram), or monoculture and intercropping of palisade grass and perennial horsegram, as well as the evaluation of the application or not of the herbicide bentazon, at the recommended dose for maize crops (0.72 kg ha-1). Relative frequency, relative density, relative abundance, relative dominance, coverage value index, importance value index, dry matter and similarity index were evaluated. In the first survey, before the pasture renewal, 23 plant species were identified. After the implantation of agrosilvopastoral systems, the species Sida cordifolia, Lantana camara and B. decumbens were the only occurring ones before and after the renewal of the pasture with agrosilvopastoral systems. The use of palisade grass and the application of the herbicide were efficient in controlling weeds. In systems that contained palisade grass and perennial horsegram, the latter was not found in the survey conducted one year after the implantation.

scholarly journals Ervas daninha em pastagens: uma abordagem fitossociológica nas áreas do Ceará

Agrarian ◽  
2019 ◽  
Vol 12 (45) ◽  
pp. 279-285
Author(s):  
Josefa Maria Francieli da Silva ◽  
Hercules Gustavo Santos Sarmento ◽  
Hellen Thayse Nascimento Araújo ◽  
Alexandre Bosco de Oliveira ◽  
Lamartine Soares Cardoso de Oliveira
Keyword(s):  
Relative Frequency ◽  
Similarity Index ◽  
Cyperus Rotundus ◽  
Weed Species ◽  
Importance Value Index ◽  
Importance Value ◽  
Brachiaria Decumbens ◽  
The One ◽  
Absolute Dominance ◽  
Nicandra Physalodes

The aim of this study was to study the phytosociology of weed species in areas of pasture cultivated with Brachiaria decumbens and Cynodon sp. (Tifton 85), in Ceará State, Brazil. The square inventory methodology was used in order to assess the weed community. Weed samples were quantified and classified by family, genus and species, using books and classification keys. The classification and quantification data of species allowed to calculate the following phytosociological variables: frequency (F), relative frequency (Fr), density (D), relative density (Dr), absolute dominance (DoA), relative dominance (DoR), importance value index (IVI), and similarity index (IS). The Amaranthaceae family was the one with the greatest intensity of species in both areas, represented mainly by Alternanthera tenera colla and Amaranthus viridis. In the area cultivated with B. decumbens, Cyperus rotundus presented higher results for frequency, density and abundance. In the Tifton 85 area, Nicandra physalodes presented higher values of density and abundance. The similarity of weed populations in pasture areas was 42.11%, with four species common to both areas.

scholarly journals WEED INCIDENCE AFTER SOYBEAN HARVEST IN NO-TILL AND CONVENTIONAL TILLAGE CROPROTATION SYSTEMS IN RORAIMA’S CERRADO

2017 ◽  
Vol 35 (0) ◽  
Author(s):  
J.A.A. ALBUQUERQUE ◽  
T.S. SANTOS ◽  
T.S. CASTRO ◽  
V.F. MELO ◽  
P.R.R. ROCHA
Keyword(s):  
Similarity Index ◽  
Dry Mass ◽  
Conventional Tillage ◽  
Weed Species ◽  
Importance Value Index ◽  
Importance Value ◽  
No Till ◽  
Rotational Systems ◽  
Botanical Classification

ABSTRACT The goal of this study was to evaluate the occurrence of weeds after soybean harvest in rotational systems of no-till and conventional tillage in the savannah of Roraima, Brazil. Two simultaneous experiments were conducted in adjacent areas, the first one with no-till soil management system and the second one with the conventional system, with crop rotations for five agricultural years: pearlmillet (2007/2008), soybean (2008/2009), maize (2009/2010), cowpea with maize (2010/2011), soybean (2011/2012) and maize (2012/2013). The used experimental design was the randomized block one with 28 plots, sized 3 x 15 m (45 m2) distributed in 4 blocks. In May 2010, the combined sowing of cowpea and maize was performed, and later, during the same month of 2011 soybean was sown. Thirty days after harvesting, weeds were collected. The botanical classification of species was performed by classes, families, scientific and popular names, as well as comparisons with specialized bibliographies. The evaluated phyto-sociological parameters were: relative frequency (FRR), relative density (DRR), dominance (Do), importance value index (IVI), Sorensen’s similarity index (SI), numbers of individuals (ha-1) and dry mass (%). Among the 37 species found in both planting systems, 60% belonged to the Liliopsida class; Fabaceae and Malvaceae stood out. However, Poaceae, belonging to the Magnoliopsida class, had the highest number of species in both systems. Most weed species were common in both systems.

scholarly journals OCORRÊNCIA DE PLANTAS DANINHAS NA CULTURA DO FEIJÃO-CAUPI SOB QUATRO MANEJOS NA AMAZÔNIA OCIDENTAL

Nativa ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 427-435
Author(s):  
Davair Lopes Teixeira Junior ◽  
José Maria Arcanjo Alves ◽  
José Anchieta Alves Albuquerque ◽  
Paulo Roberto Ribeiro Rocha ◽  
Thais Santiago Castro ◽  
...  
Keyword(s):  
Vigna Unguiculata ◽  
Weed Management ◽  
Control Strategies ◽  
Similarity Index ◽  
Natural Vegetation ◽  
Importance Value Index ◽  
Importance Value ◽  
No Till ◽  
Before And After ◽  
Herbicide Glyphosate

Sistemas de manejos das plantas daninhas, utilizando diferentes estratégias de controle, podem alterar a dinâmica populacional das plantas e favorecer o controle de algumas espécies. Objetivou-se com esse trabalho avaliar a ocorrência de plantas daninhas antes e após cultivo de feijão-caupi, em plantio direto, sob quatro formas de manejo da vegetação natural (sem roçada, com roçada, uso de fogo e dessecação com glyphosate) em área da savana Amazônica no estado de Roraima. As avaliações foram realizadas mediante a aplicação do método do quadrado inventário. As plantas daninhas situadas nas áreas amostradas foram cortadas rente ao solo, identificadas e quantificadas. Os parâmetros fitossociológicos analisados foram: frequência relativa, densidade relativa, abundância relativa, índice de valor de importância e índice de similaridade. As principais famílias identificadas foram Cyperaceae, Poaceae e Fabaceae. As formas de manejo da vegetação natural da savana de Roraima para o cultivo do feijão-caupi favoreceram a emergência de 10 espécies de um total de 29. O manejo com o herbicida glyphosate proporcionou o desenvolvimento das espécies Digitaria insularis e Hynchelitrum repens e o controle de 12 espécies, entre elas o Trachypogon plumosus, importante forrageira da região em estudo. O manejo da vegetação natural com o fogo favoreceu o surgimento da espécie Desmodium tortuosum. O manejo com glyphosate promoveu alterações na comunidade infestante de plantas daninhas, nesse foi observado os menores índices de similaridade entre os sistemas de manejo avaliados.Palavras-chave: fitossociologia; Vigna unguiculata; vegetação natural; manejo com fogo. OCCURRENCE OF WEEDS IN COWPEA CULTURE UNDER FOUR HANDLES IN THE WESTERN AMAZON ABSTRACT: Weed management systems, using different control strategies, can change the population dynamics of plants and favor the control of some species.The objective of this work was to evaluate the occurrence of weeds before and after cowpea cultivation under no-tillage under four forms of natural vegetation management (no-till, no-till, use of fire and glyphosate desiccation) in an area of savannah of Roraima. Evaluations were performed by applying the inventory square method. Weeds located in the sampled areas were sectioned close to the ground, identified and quantified. The phytosociological parameters analyzed were: relative frequency, relative density, relative abundance, importance value index and similarity index. The main families identified were Cyperaceae, Poaceae and Fabaceae. The management of the natural vegetation of the Roraima savanna for cowpea cultivation favored the emergence of 10 species out of 29. Management with the herbicide glyphosate provided the appearance of the species Digitaria insularis and Hynchelitrum repens and the control of 12 species, including the Trachypogon plumosus, an important savanna forage. The management of natural vegetation with fire favored the emergence of the species Desmodium tortuosum. Glyphosate management caused changes in the weed community, which showed the lowest similarity indexes between the evaluated management systems.Keywords: phytosociology; Vigna unguiculata; natural vegetation; fire management.

scholarly journals Phytosociological Survey of Weeds in Coffee Plants Irrigated Under Different Systems

2020 ◽  
Vol 12 (11) ◽  
pp. 179
Author(s):  
Simônica Maria De Oliveira ◽  
Abner José De Carvalho ◽  
Ignacio Aspiazú ◽  
Polyanna Mara De Oliveira ◽  
João Victor Santos Guerra ◽  
...  
Keyword(s):  
Irrigation System ◽  
Similarity Index ◽  
Sprinkler Irrigation ◽  
Dry Mass ◽  
Northern Region ◽  
Cyperus Rotundus ◽  
Weed Species ◽  
Importance Value Index ◽  
Importance Value ◽  
Irrigation Systems

The objective was to identify the species and quantify the importance value index of weeds in the cultivation of arabica coffee in two irrigation systems, at different times of the year, in the northern region of Minas Gerais. A phytosociological survey was carried out in each season of the year (spring, summer, autumn and winter) in an area cultivated with the species Coffea arabica, subjected to two irrigation systems (sprinkling and dripping). The coffee crop was implanted at a spacing of 3.5 m between rows and 0.7 meters between plants. The collection of weeds was performed using the standard method of the square inventory, which was launched between the lines of the crop. The identification of the species was carried out, the number of individuals was quantified, the dry mass, frequency, density, abundance, importance value index and coverage, and the similarity index. 33 weed species were identified, being the species with the highest IVI Euphorbia hirta, Brachiaria plantaginea, Digitaria horizontalis, Cyperus rotundus and Amaranthus spp. It was observed a higher occurrence of weeds from the monocot group in the sprinkler irrigation system while in the drip there were predominance of dicot plants.

scholarly journals LEVANTAMENTO FITOSSOCIOLÓGICO DE PLANTAS DANINHAS EM POMARES DE MANGUEIRA NO SEMIÁRIDO MINEIRO

Nativa ◽  
2019 ◽  
Vol 7 (5) ◽  
pp. 500
Author(s):  
Flávio Henrique Silva de Sena ◽  
Ignacio Aspiazú ◽  
Natanael Pereira da Silva ◽  
Renato Mendes de Oliveira ◽  
Karen Marcelle de Jesus Silva ◽  
...  
Keyword(s):  
Mangifera Indica ◽  
Similarity Index ◽  
Relative Importance ◽  
Weed Species ◽  
Importance Value Index ◽  
Importance Value ◽  
Local Conditions ◽  
Main Species ◽  
Sida Rhombifolia ◽  
Phytosociological Study

Objetivou-se identificar as principais espécies de plantas daninhas em cultivo de mangueira aos dois e oito anos após plantio. O estudo foi desenvolvido em áreas irrigados de manga ‘Palmer’ localizadas em Janaúba-MG. Para estudo fitossociológico das plantas daninhas foi utilizado o método quadrado inventário (0,25 m2). Após classificação e quantificação das espécies, foi calculado calcularam-se a frequência (F), frequência relativa (Fr), densidade (D), densidade relativa (Dr), abundância (A), abundância relativa (Ar), índice de valor de importância (IVI), índice de valor de importância relativa (IVIr) e índice de similaridade. Na área com cultivo de mangueira em produção, após oito anos do plantio, foram encontradas 17 espécies, 14 gêneros e oito famílias, sendo Sida rhombifolia a principal espécie com IVIr de 27,8%. Já na área com dois anos de plantio encontrou-se menos espécies com destaque para Paspalum urvillei com IVIr de 70,61%. O índice de similaridade entre as duas áreas foi de 18,18%. Portanto, conclui-se que nas condições locais do cultivo de mangueira de Janaúba-MG, P. urvillei e S. rhombifolia são as principais espécies encontradas em pomares após dois e oito anos após implantação, respectivamente, e além disso, estes apresentam diferentes espécies infestantes comprovado pelo valor do índice de similaridade.Palavras-chave: fitossociologia; plantas daninhas; Mangifera indica. WEED PHYTOSOCIOLOGICAL SURVEY ON MANGO ORCHARDS IN THE MINAS GERAIS SEMIARID ABSTRACT: This study aimed to identify the main weed species in mango cultivation at two and eight years after planting. The study was developed in irrigated areas of 'Palmer' mango located in Janaúba-MG. For weed phytosociological study, the square inventory method (0.25 m2) was used. The frequency (F), relative frequency (Rf), density (D), relative density (Rd), abundance (A), relative abundance (Ra), value index of importance (VII), relative importance value index (RIVI) and similarity index were determined. In the area with mango cultivation in production, after eight years of planting, 17 species, 14 genera and eight families were found, being Sida rhombifolia the main species, with RIVI of 27.8%. In the area with two years of cultivation were found less species, with emphasis to Paspalum urvillei, with RIVI of 70.61%. The similarity index between the two areas was 18.18%. Therefore, it is concluded that in the local conditions of the cultivation of mango of Janaúba-MG, P. urvillei and S. rhombifolia are the main species found in orchards after two and eight years after implantation, respectively, and, in addition, both present different weed species, as proven by the low similarity index value.Keywords: phytosociology; weed; Mangifera indica.

scholarly journals Infestation of weed species in pre-planting of soybean in succession to winter crops

2013 ◽  
Vol 31 (3) ◽  
pp. 551-558 ◽  
Author(s):  
G. Concenço ◽  
C.J. Silva ◽  
M. Tomazi ◽  
I.V.T. Correia ◽  
N.C.D.S. Souza ◽  
...  
Keyword(s):  
Weed Species ◽  
Importance Value Index ◽  
Importance Value ◽  
Crambe Abyssinica ◽  
Brachiaria Ruziziensis ◽  
Cropping Season ◽  
Winter Crops ◽  
One Year ◽  
Multivariate Cluster

This study aimed to evaluate different crops and plant species planted after soybeans for one year, in terms of their potential to inhibit the occurrence of weed species. The following crops that were planted as second crop after soybeans were evaluated: (1) corn (Zea mays) planted at spacing of 90 cm between rows, intercropped with Brachiaria ruziziensis in the inter-rows; (2) sunflower (Helianthus annuus); (3) crambe (Crambe abyssinica); (4) radish (Raphanus sativus); (5) rapeseed (Brassica napus); and (6) winter fallow - no plantation after soybeans. Phytosociological characterization of weed species was carried out at the pre-planting of soybeans in the following cropping season. Estimations of relative abundance, relative frequence, relative dominance and Importance Value Index were made for each species present. Areas were also intra-characterized by the diversity coefficients of Simpson and modified Shannon-Weiner, and areas were compared using the Jaccard similarity coefficient for presence-only, by multivariate cluster analysis. In the short‑term (a single cropping season), cultivation of winter crops do contribute for lower occurrence of weed species at the pre-planting of soybeans on the subsequent cropping season. The suppressive effects depend both on the species grown in the winter and in the amount of straw left on the soil by these winter crops. Radish was more efficient in inhibiting the occurrence of weed species and rapeseed showed composition of infestation similar to that observed at the area under fallow.

Diversity of Weeds and Population Dynamics of Predators and Prey Present in Wheat-Mustard Ecosystem at Paklihawa, Rupandehi, Nepal

2018 ◽  
Vol 35 (1) ◽  
pp. 173-181
Author(s):  
S. Khanal ◽  
S. Adhikari ◽  
A. Bhattarai ◽  
S. Shrestha
Keyword(s):  
Population Dynamics ◽  
Chenopodium Album ◽  
Effect Of Temperature ◽  
Weed Species ◽  
Importance Value Index ◽  
Importance Value ◽  
Mustard Aphid ◽  
Wooden Frame ◽  
Index Value ◽  
The Given

A study was conducted at Institute of Agriculture and Animal Science (IAAS), Paklihawa Rupandehi, agronomy field to study the diversity of weeds and population dynamics of predators and prey in wheat-mustard ecosystem. The study was conducted by quadrate sampling method using the wooden frame by selecting 40 sample spots, and locating its coordinates. Predator, prey, some of the beneficial and harmful insects as well as weed species was recorded in 5 days interval in the study. Relationships between the population of the mustard aphid and wheat aphid, lady bird beetle to maximum and minimum temperature were recorded in order to know the effect of temperature in relation to population density. Number of mustard aphid and its nymph has shown the positive significant relationship with the population of the spider in the wheat mustard ecosystem. Shannon Weiner Index value was calculated and the species richness was found to be 2.63 with the effective number of species value 9. The species evenness value was found to be 0.83 in the studied ecosystem which signifies that the given weed ecosystem is somewhat even. The importance value index (IVI) of the given ecosystem with the value of different weed species was calculated and it was found that the weed Anagalis arvensis was ranked as first with the IVI value of 57.98 following Vicia sativa and Chenopodium album. This signifies that the species Anagalis arvensis has greater control over the wheat mustard ecosystem of Paklihawa, Rupandehi.

scholarly journals Comparison of true mangrove stands in Dudepo and Ponelo Islands, North Gorontalo District, Indonesia

2018 ◽  
Vol 20 (1) ◽  
pp. 259-266
Author(s):  
FAIZAL KASIM ◽  
MIFTAHUL KHAIR KADIM ◽  
SITTI NURSINAR ◽  
ZULKIFLI KARIM ◽  
ALDIN LAMALANGO
Keyword(s):  
Similarity Index ◽  
Basal Area ◽  
Current Status ◽  
Survey Method ◽  
Landsat 8 ◽  
Importance Value Index ◽  
Importance Value ◽  
Mangrove Species ◽  
Rhizophora Apiculata ◽  
The Mean

Kasim F, Kadim MK, Nursinar S, Karim Z, Lamalango A. 2019. Comparison of true mangrove stands in Dudepo and Ponelo Islands, North Gorontalo District, Indonesia. Biodiversitas 20: 259-266. This study aimed to investigate and compare the current status of mangrove areas, as well as the composition and species diversity of mangrove stands in both regions of Dudepo and Ponelo Islands. The results showed that the mangrove areas calculated using the segmentation method in classifying image of Landsat-8 OLI (acquisition on September 2017) were 279.46 ha (Dudepo Island) and 113.35 ha (Ponelo Island) respectively. A total of 13 species of true mangrove were recorded from both islands, using survey method from 9 transect lines (TL), with a distance ranging from 40 to 210 meters (1-6 quadrats) per transect. The mean densities of trees were 2133 ± 329.78 ha-1 (Dudepo Island) and 2111 ± 234.28 ha-1 (Ponelo Island), while those of saplings and seedlings were 58 ± 13.48 ha-1 and 1425 ± 113.96 ha-1 (Dudepo Island), and 79 ± 14.51 ha-1 and 2963 ± 443.22 ha-1 (Ponelo Island). The mean diameter and basal area were 19.73 ± 10.65 cm and 84.22 ± 67.67 m2ha-1 (Dudepo Island), 17.04 ± 1.46 cm and 60.07 ± 15.12 m2ha-1 (Ponelo Island), respectively. The Importance Value Index (IVI) ranged between 3.97-114.87 (Dudepo Island) and 6.04-82.18 (Ponelo Island). The dominant and codominant species based on IVI in both islands were Rhizophora apiculata Blume and R. stylosa Griff. The indexes of diversity, richness, and evenness of mangrove species in both islands were 0.34-1.70, 0.48-1.18, 0.47-0.94 (trees), 0.00-1.10, 0.00-1.82, 0.00-1.00 (saplings), and 0.00.-1.48, 0.00-1.44, 0.72-1.00 (seedlings), respectively. The Bray-Curtis similarity index between Dudepo and Ponelo Islands, based on the overall values of community attributes, was 0.75.

scholarly journals PHYTOSOCIOLOGICAL SURVEY OF WEEDS IN ERECT PROSTRATE COWPEA CULTIVARS

2017 ◽  
Vol 35 (0) ◽  
Author(s):  
P.S.C. BATISTA ◽  
V.S. OLIVEIRA ◽  
V.B. SOUZA ◽  
A.J. CARVALHO ◽  
I. ASPIAZÚ
Keyword(s):  
Relative Density ◽  
Similarity Index ◽  
Minas Gerais ◽  
Importance Value Index ◽  
Importance Value ◽  
Cowpea Cultivars ◽  
Minas Gerais State ◽  
Weed Infestation ◽  
Amaranthus Spp ◽  
Growing Conditions

ABSTRACT The goal of this study is to characterize the weed phytosociology in some major erect and prostrate cowpea cultivars in Brazil, in the Northern growing conditions of Minas Gerais state. The test was conducted in Janaúba, Minas Gerais state. The treatments consisted in five erect cultivars (BRS Guariba, BRS Tumucumaque, BRS Novaera, BRS Itaim and BRS Cauamé) and four prostrate ones (BRS Marataoã, BRS Pajeú, BRS Pujante and BRS Xiquexique). The plots were composed of four five meter rows, spaced 0.5 m apart, for erect cultivars and 1.0 m for the prostrated ones. Weed sampling was performed 50 days after sowing by standard Square Method. The species were identified and quantified, and then dried at 65 oC for 72 hours and weighed. The frequency, absolute and relative density and abundance, the importance value index (IVI) and the similarity index were evaluated. In the erect cultivars, the Amaranthaceae, Euphorbiaceae, Asteraceae and Convolvulaceae families stood out with higher IVI’s. In prostrate cultivars, the Amaranthaceae, Asteraceae and Malvaceae families stood out. Portulaca oleracea and Amaranthus spp. were the species with the highest IVI. The similarity index between erect and prostrate cultivars was 72%; nine of the 16 families occurred in both cultivars. BRS Tumucumaque, erect, and BRS Pujante, prostrate had lower weed infestation.

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