Interação competitiva de genótipos de arroz e papuã

Galon, Leandro; Guimarães, Sebastião Carneiro; Lima, Anderson Moraes De; Radünz, André Luiz; Beutler, Amauri Nelson; Burg, Giovane Matias; Zandoná, Renan Ricardo; Perin, Gismael Francisco; Bastiani, Marlon Ouriques; Belarmino, Juliana Gomes; Radünz, Lauri Lourenço

doi:10.1590/s0100-83582014000300009

Cited by 7 publications

(11 citation statements)

References 20 publications

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“…There are several methods to investigate the competitive relationships between plants; among them, the experiments in replacement series stand out, which have been widely used for studies of different crop/weeds (Aminpanah and Javadi 2011;Bianchi et al 2006;Galon et al 2014;Rigoli et al 2008;Wandscheer and Rizzardi 2013). This method allows the understanding of the competitive process between plants, especially when related to the effect of the population as well as of the crop and weeds proportion (Aminpanah and Javadi 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Studies in substitutive series have found that usually crops have higher competitive ability than weeds (Agostinetto et al 2013;Galon et al 2014;Moraes et al 2009). This behavior is explained by the fact that the negative effect of weeds is not restricted by the largest individual competitive ability, but mainly due to the level of infestation in the area (Vilà et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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Relative competitiveness of soybean cultivars with barnyardgrass

et al. 2016

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ABSTRACT:The aim of this work was to evaluate the competitiveness between soybean cultivars and barnyardgrass, based on morphological and physiological characteristics of species. The experiments were conducted in completely randomized experimental design, with 4 replications. therefore, the ability of one species to interfere on another is equivalent.For plant height, barnyardgrass displays higher competitiveness compared to BMX Apolo RR, with early cycle and short height. The intraspecific competition is more important to barnyardgrass than interspecific competition with soybean cultivars, resulting in negative effects on the morphological and physiological characteristics of species.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relative competitiveness of soybean cultivars with barnyardgrass

et al. 2016

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“…This is a probable indicator that the competitive ability of these species may be centered on Density, one of the most notable phytosociological parameters in plant community dynamics (Concenço, Andres, Teló, Martins, & Moisinho, 2017). Alexandergrass, on the other side, seems to center its competitive ability most probably on dominance (Galon et al, 2014) since its dry mass per area was high from low plant densities onwards.…”

Section: Resultsmentioning

confidence: 99%

“…The mechanisms of stomatal opening and closure depend on factors such as solar radiation, CO 2 level in the mesophyll, relative air humidity, water potential, wind speed and growth substances inherent to each species (Galon et al, 2014), as well as others secondary factors.…”

Section: Resultsmentioning

confidence: 99%

“…When plants are submitted to competition, the physiological characteristics of growth and development are generally altered (Galon et al, 2014). This results in differences in the use of environmental resources, especially water, which directly affects the availability of CO 2 in leaf mesophyll and therefore photosynthetic efficiency (Procópio, Santos, Silva, Donagemma, & Mendonça, 2004b).…”

Section: Introductionmentioning

confidence: 99%

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Physiology of Weeds in Intraspecific Competition

Thiel¹,

David²,

Galon³

et al. 2018

JAS

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When plants are subjected to competition, their physiological behavior changes. To understand the developmental physiology of weeds will subsidize the development of cropping systems which favor the crops plants in detriment of weeds. The objective of this work was to evaluate the physiological behavior of different weed species, growing under intraspecific competition. Greenhouse experiment was conducted in randomized complete block design arranged in factorial scheme 4 × 5 with four replications. Factor A was the weed species [Urochloa plantaginea (Alexandrergrass), Bidens pilosa (hairy beggarticks), Ipomoea indivisa (morningglory) and Conyza bonariensis (hairy fleabane)], and factor B was the plant density of these species (20, 40, 60, 80 or 100 plants m -2 ). The following variables were evaluated: sub-stomatal CO 2 concentration, photosynthesis rate, consumed CO 2 , stomatal conductance, transpiration rate, water use efficiency, plant height, shoot diameter, leaf area, and shoot dry biomass. Alexandergrass relies on the superior control of stomatal opening and high water use efficiency. Hairy beggarticks efficiency in competition lies on its ability to remove water from soil to levels when the other surrounding plant species would undergo stress. Morning glory and hairy fleabane did not present detectable particular features in the study, and their importance as weeds is probably tied to other survival abilities but superior competition. In conclusion, the weed species studied present distinct competitive strategies.

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Interaction between nitrogen, soil water condition and herbicides in Urochloa plantaginea control in irrigated rice crop

Spatt¹,

Lopes

Dornelles

et al. 2021

Rev. bras. eng. agríc. ambient.

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The present study sought to verify the existence of interactions between the soil water conditions, nitrogen and herbicides commonly used to control alexandergrass in irrigated rice crop. The experimental design was completely randomized, arranged in a 2 x 3 x 4 factorial scheme, corresponding to two soil water conditions (5 cm water depth and 100% soil water holding capacity [WHC]), three nitrogen doses (0, 80 and 160 kg of N ha-1) and four doses of herbicides (0, 0.5, 1 and 2 times the registration dose). The herbicides evaluated were cyhalofop-butyl, imazapyr + imazapic and imazethapyr. The treatments were repeated four times. Phytotoxicity and dry mass were evaluated 28 days after application. For cyhalofop-butyl and imazapyr + imazapic, the phytotoxicity at 100% WHC and 5 cm water depth conditions was higher in treatments with nitrogen fertilization. However, for imazethapyr under the 100% WHC condition of soil increased phytotoxicity in the absence of nitrogen fertilization. For the flooded condition, from the dose of 35 g of a.i. ha-1, the result in the control for the herbicide imazethapyr was optimized under the conditions of fertilization with 80 and 160 kg of N ha-1. Cyhalofop-butyl and imazapyr + imazapic undergo synergistic interaction with nitrogen fertilization and water status in the control efficiency, yet with imazethapyr, the synergistic interaction only occurs under 100% of soil WHC.

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Interação competitiva de genótipos de arroz e papuã

Cited by 7 publications

References 20 publications

Relative competitiveness of soybean cultivars with barnyardgrass

Relative competitiveness of soybean cultivars with barnyardgrass

Physiology of Weeds in Intraspecific Competition

Interaction between nitrogen, soil water condition and herbicides in Urochloa plantaginea control in irrigated rice crop

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