Métodos de manejo de Cyperus esculentus na lavoura de arroz irrigado

Panozzo, Luís Eduardo; Agostinetto, Dirceu; Galon, Leandro; Moraes, Pedro Valério Dutra de; Pinto, J.J.O.; Neves, Rodrigo

doi:10.1590/s0100-83582009000100021

Cited by 17 publications

(9 citation statements)

References 13 publications

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“…que apresentaram IVI de 8,63; 29,96; 14,73 C. rotundus é uma planta invasora perene, que causa prejuízos em várias culturas. O período crítico de competição encontra-se na fase inicial de desenvolvimento das culturas, porém os prejuízos da competição ocorrem durante todo o ciclo (PANOZZO et al, 2009).…”

Section: Resultsunclassified

Fitossociologia Em Pomares De Mangueira Irrigados Por Gotejamento E Microaspersão Em Condições Semiáridas

Mesquita¹,

Soares²

2019

Enci Bio

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RESUMOSistemas de irrigação pertencentes a um mesmo método podem exercer diferentes impactos sobre a ocorrência e distribuição das plantas daninhas, portanto, objetivouse avaliar o efeito dos diferentes sistemas de irrigação localizada (microaspersão e gotejamento), sobre índices fitossociológicos das plantas daninhas em duas áreas de um pomar de mangueira 'Palmer'. As coletas foram em novembro de 2017 utilizando-se o método do quadrado inventário, de forma aleatória e em caminhamento zigue-zague nas respectivas áreas. Avaliou-se a massa seca (MS), frequência (F), frequência relativa (FR), densidade (D), densidade relativa (DR), dominância relativa (Dor), índice de valor de importância (IVI), importância relativa (IR) das espécies encontradas, e o índice de similaridade ( SJ ij ¿ entre as áreas. No pomar de mangueira irrigado por microaspersão os maiores valores de IVI e IR foram obtidos por Sorghum arundinaceum (137,63; 45,88% respectivamente) e Cyperus rotundus (98,98; 32,99%). Já no pomar irrigado por gotejamento os maiores valores de IVI e IR foram obtidos por Cyperus rotundus (119,54; 39,85% respectivamente) e Chloris barbata, (90,51; 30,17%). A densidade total de plantas daninhas foi semelhante entre as áreas, e o índice de similaridade, baixo (27,27%). Estes resultados sugerem que os sistemas de irrigação avaliados influenciaram a ocorrência de diferentes espécies de plantas daninhas nas áreas em estudo, o que pode implicar em diferentes estratégias de manejo dessas plantas a depender do sistema de irrigação utilizado. PALAVRAS-CHAVE: irrigação, Mangifera indica L., plantas daninhas. PHYTOSOCIOLOGY IN HOSE ORCHARDS IRRIGATED BY DRIP AND MICRO SPRINKLER IN SEMI-ARID CONDITIONSABSTRACT Different irrigation systems may influence the occurrence and distribution of weeds. Therefore, the objective of this study was to evaluate the influence of different irrigation systems (micro sprinkler and drip) on weed phytosociological indexes in two areas of a mango orchard 'Palmer'. Samplings were performed in November 2017, using the inventory square method. The quadrat measured 0.4 m x 0.4 m and was randomly thrown on the field in zigzag. The following data were assessed: dry matter (DM), frequency (F), relative frequency (RF), density (D), relative density (RD),

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Section: Resultsunclassified

Fitossociologia Em Pomares De Mangueira Irrigados Por Gotejamento E Microaspersão Em Condições Semiáridas

Mesquita¹,

Soares²

2019

Enci Bio

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“…This species is also difficult to control, causing reductions in the stand and in a range of commercial crops. For this reason, it is among the 20 weed species that cause the most damage to global agriculture (Panozzo et al 2009).…”

Section: Resultsmentioning

confidence: 99%

“…According to Monquero et al (2009), a small amount of rattlepod on the soil surface does not inhibit the weed infestation, while larger amounts resulted in the emergence of weakened weeds, with yellowing, necrosis and deformed leaves, likely due to physical and/or chemical effects. The small amount of rattlepod used in the present study likely resulted in the inefficient control of weed infestation, especially C. rotundus, since it propagates aggressively (Panozzo et al 2009, Hussain et al 2017). Thus, a large amount of rattlepod exhibits an allelopathic effect, which is the inhibitory or stimulating effect of a plant on other species, resulting from the release of chemical substances into the environment and contributing to reduce the weed population (Scholberg et al 2006).…”

Section: Weeds Parametersmentioning

confidence: 96%

Soil management and mulching for weed control in cowpea

Júnior

Andrade

Reis

et al. 2018

Pesqui. Agropecu. Trop.

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More efficient weed control managements can be achieved through different strategies, given that the population of these plants changes according to the system used. This study aimed at assessing solarization methods associated with different mulches for weed control in the cowpea crop. The methods used were soil solarization, with plastic sheeting and with solar collector, associated with the following mulches: castor bean, rattlepod and spontaneous vegetation. Weed phytosociology was calculated by frequency, density and abundance. The most infesting families were Asteraceae, Poaceae and Amaranthaceae. The species with the highest frequency, density and abundance in the treatments without mulching was Cyperus rotundus, while Bidens spp. occurred only in non-solarized soil and without mulching. The largest number of weeds was found in the treatments without mulching in non-solarized soil or soil solarized with plastic sheeting, the latter being less efficient than the solar collector. Mulching inhibits the weed infestation in cowpea crops, irrespective of soil solarization. However, rattlepod as mulch is more efficient in the solarization with plastic sheeting than with a solar collector.

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“…Weed interference in irrigated rice growing varies according to the weed species, the infestation intensity, the cultivar and the field handling (Panozzo et al, 2009). This way, identifying the species in an area, as well as its relative significance (frequency, density and dominance), is the first step to the adequate weed handling.…”

Section: Introductionmentioning

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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Métodos de manejo de Cyperus esculentus na lavoura de arroz irrigado

Cited by 17 publications

References 13 publications

Fitossociologia Em Pomares De Mangueira Irrigados Por Gotejamento E Microaspersão Em Condições Semiáridas

Fitossociologia Em Pomares De Mangueira Irrigados Por Gotejamento E Microaspersão Em Condições Semiáridas

Soil management and mulching for weed control in cowpea

Weed Phytosociological Survey in Irrigated Rice

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