Identificação e interferência de plantas daninhas em pinhão-manso

Fey, Rubens; Schulz, Deisinara Giane; Dranski, João Alexandre Lopes; Júnior, José Barbosa Duarte; Malavasì, Marlene de Matos; Malavasi, Ubirajara Contro

doi:10.1590/s1415-43662013000900007

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…These characteristics are strongly influenced by the coexistence period and by the interference with weeds. The longer the coexistence period, the more intense the interference and the lower the crop productivity (Alves et al, 2013;Fey et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

Periods of Weed Interference on Orange Tree Crops

et al. 2018

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Current orange tree cultivation practices in the Brazilian State of Amazonas present several production problems, being the inadequate weed management the most important one, and significantly affecting fruit productivity. However, if weeds are managed properly, their coexistence with orange cultivars does not affect the fruit yield of orange trees. Thus, the objective of this research was to identify the period of longer weed interference in orange production. The treatments were conducted during the 2013 and 2014 harvests as follows: one control treatment with no coexistence of weeds and crop throughout the growing season; and six periods of coexistence (October to January, February to May, June to September, October to May, October to January, June to September, and February to September). The coexistence of weeds from October to May with orange trees increased the fall of unripe fruits and reduced the yield and the number of oranges per plant. Therefore, this period was considered as the most critical one for the control of weeds in orange trees.

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Section: Resultsmentioning

confidence: 99%

Periods of Weed Interference on Orange Tree Crops

et al. 2018

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“…The main species of weeds in the beds were evaluated in five samples of 0.25 m 2 obtained randomly at 30, 60, and 90 days. The weeds were identified by family, genus, and species (Fey et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

Soil cover with rice husk, polyethylene and biodegradable film in bell pepper (Capsicum annum L.) cultivation

et al. 2020

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A field trial regarding the effect of different types of soil cover on the characteristics of bell pepper (Capsicum annuum L. Yolo Wonder) fruit and incidence of weeds was conducted at the facilities of the Department of Agrarian Sciences (UNITAU), Taubaté -SP at 23º02'34" S and 45º31'02" W, with an average elevation of 577 m in a medium-textured dystrophic Yellow Red Latosol. The experimental design was a randomized block with five replicates and four treatments: 1) coat of rice husk (CRH); 2) black polyethylene film (BPF); 3) black biodegradable film (BBF); and 4) soil without cover (SWC), with five replicates. The treatments were distributed in flower beds with 1.2 m wide, 0.3 m high and 10 m long. Drip irrigation was placed on the surface of the beds, with a pipe line (dripping distance 0.4 m, measured flow rate of 1.67 L.h-1, service pressure of 1.6 kPa). Harvesting occurred 90 days after planting the seedlings, and the length, number and weight of the bell pepper fruits were determined. The weed plants in the plot were evaluated in five samples of 0.25 m2 randomly obtained per plot. The coverings had a significant effect on fruit length, number and weight, and black polyethylene film and biodegradable film obtained better results, compared to the coat of rice husk and soil without cover. In the coverings with polyethylene film and biodegradable film, the fruit length was above 12 cm, the number of fruit exceeded 10 fruit per plant and the weight of the fruit was superior to 1 kg per plant. Polyethylene film and biodegradable film reduced weed infestation by 75.4% on average when compared to soil without cover. It can be concluded that the biodegradable film presented the same efficiency as the polyethylene film as regards the productivity of the pepper crop and the reduction of weeds.

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“…The degree of interference of weeds is influenced by their size, density and distribution in the area of cultivation, the environment (climate, soil and management), and the period of coexistence with the crop (Batista et al, 2017). The early stages of development of the crop are more critical due to the restriction of sunlight on the crop, resulting from the shade provided by the weed community (Fey et al, 2013). In the establishment of weed management strategies, the identification of weed species is a sine qua non within the growing environment and at the different stages of the crop, since the order of importance is established based on their frequency, density and dominance, as each species presents a different dynamic of growth and establishment in the area, and the individual aggressiveness of each species influences the cultivated species in a different way (Cunha et al, 2014;Albuquerque et al, 2017;Silva et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Floristic composition of weeds in a dystrophic Red-Yellow Argisol under the cultivation of cowpea, cv. BRS Novaera

et al. 2019

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Among the several factors that negatively influence cowpea culture, weeds have been responsible for the reduction of growth, development and productive performance of the crop, making it necessary to establish management strategies based on phytosociological studies of weed species in growing areas. Therefore, the objective of this research was to evaluate the floristic composition of weeds, aiming to identify the main species and their dynamics, and to consider their distribution in time and space as pertaining to the cultivation of a modern variety of cowpea, cv. BRS Novaera, in dystrophic Red-Yellow Argisol, in the Midnorth region of the state of Piauí, Brazil. The phytosociological survey of weeds was carried out in three sessions: the first one was immediately before the area was desiccated with glyphosate (15 days before sowing the cowpea), and the others were at 20 and 40 days after sowing (DAS). Following the quantification of species and number of individuals, the following phytosociological parameters were calculated: frequency and relative frequency; density and relative density; abundance and relative abundance; and importance value index. It was concluded that there were few changes in the floristic composition of the weed community according to the epoch of the phytosociological surveys. The main weed plants at 20 DAS of cowpea (vegetative phase) were Chamaesyce hirta, Digitaria insularis, Alternanthera tenella, Cleome affinis, Mollugo verticillata and Portulaca oleracea. At 40 days (reproductive phase), the weed species with a large establishment and acting as potential competitors with cv. BRS Novaera cowpea were Digitaria insularis, Chamaesyce hirta and Mollugo verticillata.

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Identificação e interferência de plantas daninhas em pinhão-manso

Cited by 8 publications

References 17 publications

Periods of Weed Interference on Orange Tree Crops

Periods of Weed Interference on Orange Tree Crops

Soil cover with rice husk, polyethylene and biodegradable film in bell pepper (Capsicum annum L.) cultivation

Floristic composition of weeds in a dystrophic Red-Yellow Argisol under the cultivation of cowpea, cv. BRS Novaera

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