Composição florística de plantas daninhas em agrossistemas de cupuaçuzeiro (Theobroma grandiflorum) e pupunheira (Bactris gasipaes)

Souza, Larissa; Silva, J.F.; Souza, M.D.B.

doi:10.1590/s0100-83582003000200010

Cited by 18 publications

(21 citation statements)

References 2 publications

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“…The emergence of these seeds was related to environmental greenhouse conditions, characterized by favorable humidity and sunlight. Souza (2003) verified the same behavior in a study on cupuaçu and wild palm (pupunha) plants in monoculture and agroforest system, where plants classified as monocotyledon benefited from more ample spacing of the single plantings. For the study cited, dicotyledons species predominated in agro forestry systems with a lower incidence of sunlight.…”

Section: Resultssupporting

confidence: 63%

“…Such circumstances favor the establishment of spontaneous plants, which can interfere negatively on the vigor and productivity of cultures. In agro-forestry systems, species arrangement maximizes the utilization of these resources and promotes culture development, restraining competition between the cultivated species and the weeds (Souza, 2003). Various studies recorded weed reduction in coffee plantations set up under agro-forestry systems (Nestel & Altieri, 1992).…”

Section: Introductionmentioning

confidence: 99%

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Seed bank from soil of coffee plantations associated with grevillea trees

et al. 2008

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-This study aimed to study the composition and dynamics of seed bank from soil of coffee plantations associated with grevilea trees in the experimental fields of the Southwest Bahia State University, on Vitória da Conquista campus. The experiments were carried out from September 2006 to May 2007. The coffee trees (Coffea arabica) were sown at three x one m spacing, associated with grevillea trees (Grevillea robusta) and maintained at densities of 277, 139, 123, 69, 62 and 31 plants ha -1 , under direct sunlight. One hundred grams of soil were taken from each treatment with four repetitions and later identified and counted with a 10x magnifying glass. To determine seedling emergence, four soil samples of 1000 g were collected from each experimental field and transported to the greenhouse. Seedling emergence was observed by counts after 15, 30 and 45 days. The experimental design was randomized blocks of seven treatments (soil from different tree densities) and four replicates; the experimental unit consisted of a plastic tray (0, 30 x 0.22 x 0.06 m) containing 1.000 g of soil. The variables utilized to characterize the bank and its dynamics were: relative frequency, relative density, relative abundance, importance index and species diversity (Shannon-Weaver index).Increased number of monocotyledon seeds and sprouts were verified in the treatments maintained under full sunlight.

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Section: Resultssupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Seed bank from soil of coffee plantations associated with grevillea trees

et al. 2008

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“…Studies on weeds in perennial crops have been conducted for several species, including forest species (Toledo et al, 2000a, b), fruit trees (Carvalho et al, 1993;Senarathne et al, 2003;Souza et al, 2003;Yanagizawa & Maimoni-Rodella, 1999), and other types of crops (Aguilar et al, 2003;Ronchi et al, 2003;Santa-Cecília et al, 1997;DeFrank & Clement, 1995). Such studies have evaluated the floristic composition of weeds (Souza et al, 2003;Yanagizawa & Maimoni-Rodella, 1999), their influence on nutrient accumulation by the crop (Ronchi et al, 2003), the incidence of pests (Santa-Cecília et al, 1997), initial plant development (Toledo et al, 2000a, b) and their effect on crop yield (Carvalho et al, 1993;DeFrank & Clement, 1995;Senarathne et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…Such studies have evaluated the floristic composition of weeds (Souza et al, 2003;Yanagizawa & Maimoni-Rodella, 1999), their influence on nutrient accumulation by the crop (Ronchi et al, 2003), the incidence of pests (Santa-Cecília et al, 1997), initial plant development (Toledo et al, 2000a, b) and their effect on crop yield (Carvalho et al, 1993;DeFrank & Clement, 1995;Senarathne et al, 2003). When not controlled, weeds reduce the initial growth of perennial plants, negatively influencing stem diameter and height (Toledo et al, 2000a, b), nutrient content (Ronchi et al, 2003) and crop yield (Carvalho et al, 1993;Senarathne et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Floristic composition and growth of weeds under custard apple (Annona squamosa) progenies

Silva¹,

Barbosa

Oliveira³

et al. 2004

Planta daninha

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-Weeds have a negative influence on several fruit tree characteristicsKey words: Annona squamosa, custard apple fruit, weeds. RESUMO -As plantas daninhas (PD) afetam várias características das fruteiras, inclusive orendimento, e podem dificultar a execução de tratos culturais nos pomares. Existe interesse em métodos alternativos de manejo das PD, visando reduzir o uso de herbicidas, que são caros e causam degradação ambiental. Dentre esses métodos, a adoção de cultivares com maior habilidade competitiva com as PD tem despertado atenção internacional. O objetivo do trabalho foi avaliar a composição florística e o crescimento de PD sob a copa de progênies de pinheira irrigadas. Vinte progênies de meias-irmãs, com idade aproximada de três anos, foram avaliadas no delineamento de blocos ao acaso, com cinco repetições e quatro plantas por parcela. Ao redor do caule de cada planta estabeleceu-se um círculo com área de 0,5 m 2 . Nessa área, foram avaliadas a composição e as massas das matérias fresca e seca da parte aérea das PD. Avaliaram-se também os diâmetros do colo e da copa e a área da folha das progênies. Ocorreram 58 espécies de PD. As famílias com maior número de espécies, em ordem decrescente, foram Leguminosae, Convolvulaceae, Euphorbiaceae, Malvaceae e Sterculiaceae. O número de espécies de PD/parcela variou de 6 a 18, porém não houve diferença entre a porcentagem média de diferentes PD sob a copa das progênies. As menores massas de matérias fresca e seca de PD ocorreram nas progênies JG1 e SM8, respectivamente. Não houve diferenças entre progênies quanto a diâmetro do colo e área foliar, mas sob a copa da progênie FE4, que apresentou o maior diâmetro da copa, observou-se um dos menores rendimentos de matéria seca de PD. Palavras-chave:Annona squamosa, fruta-do-conde, invasoras. SILVA, P.S.L. et al.

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“…Austin (Paz et al 2013). Ademais, a presença de frutos durante quase todo o ano pode aumentar as chances de dispersão e, especialmente a colonização de novas áreas, uma vez que a espécie estudada possui hábito ruderal, assim como o descrito para a maioria das espécies do gênero Ipomoea (Souza et al 2003;Correia & Durigan 2004;Timossi & Durigan 2006;Silva et al 2008). As espécies de Ipomoea são comumente encontradas em locais antropizados e/ou perturbados, ou até mesmo em bordas de fragmentos.…”

Section: Resultsunclassified

Biologia reprodutiva de Ipomoea eriocalyx (Convolvulaceae): espécie com distribuição restrita às regiões do leste do Brasil

Paz

Pigozzo

2013

Rodriguésia

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ResumoIpomoea eriocalyx Meisn. é uma espécie nativa, de distribuição restrita a alguns estados do Nordeste e Sudeste, sendo limitada aos domínios fitogeográficos da Caatinga e Mata Atlântica. O presente estudo objetivou investigar aspectos da floração, biologia floral e o mecanismo de polinização de I. eriocalyx, em um remanescente urbano de Mata Atlântica, em Salvador (BA), visando registrar, também, dados ecológicos. A floração e frutificação de I. eriocalyx foram contínuas ao longo do ano. As flores são conspícuas, de formato infundibiliforme, apresentam antese diurna, e oferecem pólen, e possivelmente néctar como recurso floral. Apesar das características melitófilas, as flores também são atrativas a outros visitantes florais, tais como borboletas, moscas e besouro. Ipomoea eriocalyx é autocompatível, e adicionalmente, apresenta as abelhas [Ceratina (Crewella) spp. e Melitoma segmentaria] como polinizadores principais, fatos que podem favorecer o seu estabelecimento em ambientes antropizados. Palavras-chave: Apoidea, flores efêmeras, melitofilia, planta ruderal, trepadeira. AbstractIpomoea eriocalyx Meisn. is a native Brazilian species, with distribution restricted to states in the northeastern and southeastern regions, limited to Caatinga and Atlantic Forest phytogeographic domains. This study aimed to investigate aspects of flowering, floral biology and the pollination mechanism of I. eriocalyx in an urban remnant of Atlantic Forest, Bahia, including ecological data. Flowering and fruiting of I. eriocalyx were continuous throughout the year. Flowers are showy, infundibiliform, with diurnal anthesis, and offer pollen and possibly nectar as floral resources. Although they present melittophilous features, the flowers are also attractive to other flower visitors, such as butterflies, flies and beetles. Ipomoea eriocalyx is self-compatible and has bees [(Ceratina (Crewella) spp. Melitoma segmentaria] as the main pollinators, a fact that could favor its establishment in anthropogenic environments.

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Composição florística de plantas daninhas em agrossistemas de cupuaçuzeiro (Theobroma grandiflorum) e pupunheira (Bactris gasipaes)

Cited by 18 publications

References 2 publications

Seed bank from soil of coffee plantations associated with grevillea trees

Seed bank from soil of coffee plantations associated with grevillea trees

Floristic composition and growth of weeds under custard apple (Annona squamosa) progenies

Biologia reprodutiva de Ipomoea eriocalyx (Convolvulaceae): espécie com distribuição restrita às regiões do leste do Brasil

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