Habilidade competitiva relativa de arroz irrigado com arroz-vermelho suscetível ou resistente ao herbicida imazapyr + imazapic

Rubin, Rafael Salles; Langaro, Ana Cláudia; Mariani, Franciele; Agostinetto, Dirceu; Berto, Roberta Manica

doi:10.1590/1808-1657001242012

Cited by 14 publications

(16 citation statements)

References 20 publications

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“…The presence of concave lines in all simulations indicated that there was competition for the same resources in the environment, with mutual injury to the growth of both the crop and the competitor (RUBIN et al, 2014). These losses are observed even in the smallest proportions of the weed species, which indicates that this can cause damage to the crop even in low population, as observed in the barley culture under the influence of ryegrass (GALON et al, 2011) or soybean in the presence of radish (BIANCHI; FLECK; LAMEGO, 2006).…”

Section: Resultsmentioning

confidence: 96%

“…These PRT results of concave lines and values lower than 1, allow to infer that competition occurred between the bean and the hairy beggarticks by the same resources present in the environment. According to Rubin et al (2014), when PRT <1, there is mutual antagonism between species that are competing for the resources of the environment.…”

Section: Resultsmentioning

confidence: 99%

“…When the PRT is equal to unit 1 (straight line), competition occurs for the same resources; If it is greater than 1 (convex line), competition is avoided. If the PRT is less than 1 (concave line), there is a mutual loss of growth (COUSENS, 1991;RUBIN et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

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Competitive Ability of Bean Cultivars With Hairy Beggarticks

et al. 2017

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Weed interference is a factor that limits the productivity of beans and, among these, hairy beggarticks is one of the main species competing with the crop for environmental resources. Thus, the aim of this study is to evaluate the competitive ability of black bean cultivars (BRS Campeiro, IPR Uirapuru, SCS204 Predileto and BRS Supremo) in the presence of a biotype of hairy beggarticks. The experimental design is a completely randomized block with four replications. Treatments were arranged in a replacement series, consisting of a proportion of the crop and the hairy beggarticks: 100:0; 75:25; 50:50: 24:75, and 0:100, which corresponds to 40:0, 30:10, 20:20, 10:30, and 0:40 plant pots1. We accomplished competitive analysis through diagrams applied to the replacement series, as well as using relative competitive indices. The leaf area and shoot dry mass were evaluated at 40 days after emergence of the species. There was competition between bean cultivars and hairy beggarticks for the same environmental resources, causing negative interference in the growth of the species, independent of the proportion of plants. Bean cultivars had a lower relative loss by reducing the morphological variables of the hairy beggarticks, thereby demonstrating superiority in its competitive ability in relation to the weed. Interspecific competition is less damaging than intraspecific competition for both species.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

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Competitive Ability of Bean Cultivars With Hairy Beggarticks

et al. 2017

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“…The widespread use of the Puitá INTA-CL cultivar should be reconsidered, as it presents a low competitive capability against the weed species (Rubin et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

Weed Phytosociological Survey in Irrigated Rice

2018

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-The phytosociological method helps evaluate the vegetation composition. The objective of this study was to identify and quantify the main weed species present in irrigated rice. The phytosociological survey was carried out in three mainly rice monoculture, Clearfield ® technology using properties in Itaqui-RS, between 2013 and 2014. For each property and period, a ½ ha representative area was selected and 10 random samples were collected, using a quadrat square of 1 m 2 . The sample colletion was conducted in two periods of time: during the irrigated rice crop initial growth and during the cereal's pre-harvesting phase. All collected plants were identified and counted, allowing for their frequency, relative frequency, density, relative density, abundance, relative abundance, relative importance index and similarity index to be calculated. Eleven weed species belonging to five families were identified. Poaceae and Cyperaceae occurred more frequently. During the initial growth of rice, the Poaceae family presented the largest index of relative importance, mainly to Echinochloa crus-galli, Echinochloa colona and Digitaria horizontalis. Overall, there was a reduction in plant density in the pre-harvest period. However, Echinochloa colona and Oryza sativa occurred in density levels that may interfere with the cereal yield. Aeschynomene denticulata, Cyperus iria and Oryza sativa are not controlled efficiently, indicating possible cases of herbicide resistance. Our conclusions emphasize the importance of correct weed species identification for the management of Echinochloa colona and Cyperus ferax. Integrated management practices are necessary for efficient weed control, avoiding productivity loss in the region's flooded rice fields. Keywords

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“…An analysis of the rice time series from 2012 to 2018 in Rio Grande do Sul shows a steady increase in yield of up to 8.0 Mg ha -1 , but this value is below the best yields obtained by farmers in the state, which is of 12 Mg ha -1 (Ribas et al, 2016). One of the major factors causing the gap between average state yield and best yield is the unsatisfactory weed control (Rubin et al, 2014).…”

Section: Introductionmentioning

confidence: 96%

Introducing rice yield loss caused by weed competition into the SimulArroz model

Richter

Streck

Zanon

et al. 2019

Pesq. agropec. bras.

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The objective of this work was to model weedy rice (Oryza sativa) and barnyard grass (Echinochloa spp.) competition with flood-irrigated rice, introducing it as a submodule into the SimulArroz model. The competition of both weeds with irrigated rice was modeled using the rectangular hyperbola equation. The “i” and “a” coefficients of the rectangular hyperbola for each of these weeds were obtained from the literature and from field experiments carried out in the state of Rio Grande do Sul, Brazil. In SimulArroz, yield loss was applied to penalize yield in all three technological levels (high, medium, and low) of physiological maturity. For weedy rice, the coefficient values of imean for the high, medium, and low technological levels were 1.04, 1.50, and 3.57 respectively, and, for barnyard grass, 4.70, 10.49, and 15.51 respectively. Coefficient “a” was 100 for weedy rice, and amean values for barnyard grass were 101.63, 104.92, and 96.88 for the high, medium, and low levels, respectively. The yield loss approach was suitable to model the competition of weedy rice and barnyard grass with irrigated rice. The submodule yield loss caused by the competition of weedy rice and barnyard grass with irrigated rice improves the predictive capacity of the SimulArroz model.

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Habilidade competitiva relativa de arroz irrigado com arroz-vermelho suscetível ou resistente ao herbicida imazapyr + imazapic

Cited by 14 publications

References 20 publications

Competitive Ability of Bean Cultivars With Hairy Beggarticks

Competitive Ability of Bean Cultivars With Hairy Beggarticks

Weed Phytosociological Survey in Irrigated Rice

Introducing rice yield loss caused by weed competition into the SimulArroz model

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