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

Silva, P.S.L.; Barbosa, Zenaide; Oliveira, Odaci Fernandes de; Antonio, Rolando; Silva, P.I.B.

doi:10.1590/s0100-83582004000400006

Cited by 2 publications

(2 citation statements)

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“…The rootstock factor, determining the fruit tree crown size, had a much smaller influence on the level of weed infestation than the water conditions. The phenomenon of significant weed suppression under a large tree canopy, reported by Silva et al [22], was observed in the present study only in case of Epilobium adenocaulon and Trifolium repens. These two species became dominant late during the fruit-bearing period.…”

Section: Discussioncontrasting

confidence: 50%

“…Some weed species can be present in the orchard only in certain vegetation periods, whereas other ones are observed every year and show a nearly constant frequency [18,19]. As the diameter of the tree canopy increases, the number of weeds found under the tree shrinks [22]. From the point of view of fruit production, it is important to determine the weed abundance levels beyond which particular weed species become harmful for the agricultural landscape [23].…”

Section: Introductionmentioning

confidence: 99%

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The weed composition in an orchard as a result of long-term foliar herbicide application

Licznar-Małańczuk

Sygutowska

2016

Acta Agrobot

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The weed composition and the dominance of individual species occurring in an orchard were assessed at the Research Station of the Wrocław University of Environmental and Life Sciences, Poland, during the first 10 years after orchard establishment. ‘Ligol’ apple trees were planted in the spring of 2004 (3.5 × 1.2 m). Foliar herbicides were applied in 1 m wide tree rows twice or three times per each vegetation period. In the inter-row spaces, perennial grass was maintained.Ten years of maintenance of herbicide fallow contributed to a change in the weed composition in the orchard. It changed as a result of different responses of the most important weed species to the foliar herbicides. Total suppression of Elymus repens was observed in the first year after planting the trees. Convolvulus arvensis, Cirsium arvense, and other perennial weeds, completely disappeared in the succeeding periods. The maintenance of herbicide fallow did not affect the abundance of Taraxacum officinale. The percentage of the soil surface covered by Trifolium repens and Epilobium adenocaulon, perennial weeds with considerable tolerance to post-emergence herbicides, increased during the fruit-bearing period of the trees. The abundance of these weeds was significantly reduced only in the rows with the stronger growing trees on the semi-dwarf P 2 rootstock. Stellaria media was the dominant annual weed. Senecio vulgaris, Poa annua, Capsella bursa-pastoris, and Lamium spp. were also frequently observed. A significant increase in the abundance of annual and perennial weeds was found in the tree rows as a result of improved water availability after a period of high precipitation.

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Section: Discussioncontrasting

confidence: 50%

Section: Introductionmentioning

confidence: 99%

The weed composition in an orchard as a result of long-term foliar herbicide application

Licznar-Małańczuk

Sygutowska

2016

Acta Agrobot

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Caracterização da área foliar de Merremia aegyptia

et al. 2009

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RESUMO -O conhecimento da área foliar de plantas daninhas pode auxiliar o estudo das relações de interferência entre elas e as culturas agrícolas. O objetivo desta pesquisa foi determinar uma equação matemática que estime a área foliar de Merremia aegyptia, a partir da relação entre as dimensões lineares dos limbos foliares. Folhas da espécie foram coletadas de diferentes locais na Universidade Estadual Paulista, Jaboticabal, Brasil, medindo-se o comprimento (C), a largura máxima (L) e a área foliar de três tipos de folíolos. Foram estimadas equações lineares (Y = a*X) para cada tipo de folíolo. A área foliar da espécie pode ser estimada pelo somatório das áreas dos limbos foliares de cada tipo de folíolo, por meio da equação AF est = 0,547470(X) + 1,145298(Y) + 1,244146(Z), em que X indica C*L do folíolo principal e Y e Z indicam C*L médios dos folíolos primário e secundário, respectivamente.Palavras-chave: planta daninha, crescimento, corda-de-viola.ABSTRACT -Weed leaf area knowledge can provide a support to study the relationships of interference between weeds and crops. The objective of this research was to determine a mathematical equation to estimate the leaf area of Merremia aegyptia based on the relation among the linear measures of the leaf blades. Leaves of this species were gathered from different places at Sao Paulo State University, Jaboticabal, Brazil, by measuring length (L), maximum width (W,) and leaf area of three types of leaflets. Linear equations (Y = a*X) were estimated for each type of leaflet. The leaf area of the species can be estimated by the sum of the leaf areas of each leaflet type according to the equation LA est = 0.547470(X) + 1.145298(Y) + 1.244146(Z), where X indicates L*W of the main leaflet, and Y and Z indicate the medium L*W of the primary and secondary leaflets, respectively.

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

Cited by 2 publications

References 26 publications

The weed composition in an orchard as a result of long-term foliar herbicide application

The weed composition in an orchard as a result of long-term foliar herbicide application

Caracterização da área foliar de Merremia aegyptia

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