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Registros recuperados: 7
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Atrazine Reduces the Critical Period of Weed Interference on Narrow Row Corn Planta Daninha
PADILHA,M.; BARROSO,A.A.M.; CARVALHO,L.B.; COSTA,F.R.; BIANCO,S..
ABSTRACT The objective was to determine whether a change occurs in the critical period of weed interference prevention in narrow row corn with the use of atrazine and whether there is influence of the herbicide on crop yield components. The treatments consisted of periods without or with an initial weed control (0, 21, 35, 49, 63, 77, and 91 days after emergence), with or without application of atrazine in spikely post-emergence. The experiment was carried out in a 2 x 7 randomized blocks design (with and without weed control and seven periods with three replications). The use or not of atrazine was arranged in a split plot design. The most important weed species were Senecio brasiliensis, Urochloa plantaginea, Conyza bonariensis, Sida rhombifolia, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Herbicide; Period of coexistence; Zea mays.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000400721
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EFFECTS OF ENVIRONMENTAL FACTORS ON SEED GERMINATION AND EMERGENCE OF GLYPHOSATE RESISTANT AND SUSCEPTIBLE SOURGRASS Planta Daninha
MARTINS,J.F.; BARROSO,A.A.M.; ALVES,P.L.C.A..
ABSTRACT Sourgrass is one of the most problematic weeds of Brazil. It is an aggressive species in the allocation of resources from the environment and reported to be glyphosate resistant in several states of the country. This work has aimed to verify environmental effects on seed germination and seedling emergence of sourgrass. Laboratory and field trials were conducted to determine the effects of temperature, light, photoperiod, water availability and depth of burial in germination and emergence of seeds. The maximum germination was greater than 80% for seed originated from resistant plants between 15 and 30 oC. For the susceptible ones, the maximum germination occurred only at 30 oC. Germination occurred for both biotypes independent of the presence of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Digitaria insularis; Water availability; Photoperiod; Seeds; Temperature.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100243
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Growth and Development of Ipomoea Weeds Planta Daninha
BARROSO,A.A.M.; FERREIRA,P.S.H.; MARTINS,D..
ABSTRACT: Weeds reduce the productive potential of crops. Plants of the Ipomoea genus, besides competing for water, light, space and nutrients, create problems in crop harvests due to their volatile stems. The objective of this work was to evaluate the growth and development of five Ipomoea species. For such, Ipomoea grandifolia, Ipomoea hederifolia, Ipomoea nil, Ipomoea purpurea and Ipomoea quamoclit plants were analyzed during the summer and winter season. Five destructive and periodic growth evaluations were carried out for each study, where leaf number, leaves, stems, roots and the total biomass were analyzed. Phenological stages of the plant development were also evaluated for emergence, flowering and maturation sub-periods by degree-days, totalizing...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Morning glory species; Ipomoea grandifolia; Ipomoea hederifolia; Ipomoea nil; Ipomoea purpurea; I. quamoclit.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100233
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Population Interference of Glyphosate Resistant and Susceptible Ryegrass on Eucalyptus Initial Development Planta Daninha
BRAGA,A.F.; BARROSO,A.A.M.; AMARAL,C.L.; NEPOMUCENO,M.P.; ALVES,P.L.C.A..
ABSTRACT: The repetitive use of herbicides with the same mechanism of action causes the selection of resistant weeds, such as ryegrass. Considering the occurrence of ryegrass (Lolium multiflorum) in eucalyptus, a crop on which glyphosate is used, it is necessary to study its interference. The objective of this study was to evaluate the effect of densities (0, 10, 20, 30 and 50 plants m-2) of two ryegrass biotypes (resistant and susceptible to glyphosate) on seedlings of two eucalyptus clones (I-144 and 1407). The used experimental design was in randomized blocks with four replications, following a 2 x 5 factorial arrangement for each clone. The height and diameter of the clones were evaluated at 0, 14, 28, 42, 56 and 70 days after transplantation (DAT),...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lolium multiflorum; Eucalyptus urograndis; Competition.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100286
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Susceptibility Among Populations of Crabgrass to Herbicides Inhibiting Photosystem II Planta Daninha
LUCIO,F.R.; BARROSO,A.A.M.; TOLEDO,R.E.B.; PITELLI,R.A.; VICTORIA FILHO,R..
ABSTRACT: Weed interference reduces the productive potential of crops. Among the control methods used, chemical ones occupy a major position. The repeated application of the same mechanism of action selects tolerant plants. Among the species that affect sugarcane, crabgrass is one of them. This study has aimed to know the tolerance of different populations of this species to herbicides inhibiting photosystem II. Three populations were collected, identified and submitted to the application of ametryn and diuron herbicides in ten different doses, and the experiment was conducted in a experimental design of complete randomized blocks with four repetitions in a factorial arrangement of 10 x 3 (10 doses x 3 populations), being one trial for each herbicide....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Digitaria horizontalis; Ametryn; Diuron; Tolerance; Resistance.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100242
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Use of Herbicides in Sugarcane in the São Paulo State Planta Daninha
REIS,F.C.; VICTÓRIA FILHO,R.; ANDRADE,M.T.; BARROSO,A.A.M..
ABSTRACT: Sugarcane is one of the main agricultural cultivations of Brazil, and one of the crops in which herbicides are most applied. In the 2017/2018 season, the estimated sugarcane production was 694.54 million tons, with an estimated increase of 0.9% in yield for this season. In order to evaluate the use of herbicides in this crop in the São Paulo State during a five-year period, a survey was carried out with sugarcane farmers. The use of herbicides applied alone and in a formulated mixture, according to their mechanism of action, were evaluated from 2010 to 2014. Photosystem II inhibitor herbicides were the most used in this period and the total amount of herbicides of almost all mechanism of action increased from 2010 to 2014, except for photosystem...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Marketing; Mechanism of action; Research; Pesticides; Saccharum officinarum.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100262
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WEED COMMUNITY INTERFERENCE AND PHYTOSOCIOLOGICAL STUDIES IN A SWEET SORGHUM CROP Planta Daninha
GIANCOTTI,P.R.F.; MORO,M.S.; NEPOMUCENO,M.P.; MARTINS,P.F.R.B.; BARROSO,A.A.M.; ALVES,P.L.C.A..
ABSTRACT This research was carried out to evaluate the interference periods and phytosociological indexes of the weed community on sweet sorghum, hybrid CVSW 80007, cultivated for two seasons in a year. The treatments were based on an increased duration of weed presence and weed absence after sowing (0, 4, 7, 14, 21, 28, 35, 42, 56 and 68 days after crop emergence for the summer season and 0, 4, 7, 14, 21, 28, 35, 42, 49, 56, 63 and 100 days for the fall season). The weed community was evaluated based on the number of weeds and the dry mass of each weed population in each period of weed control in the summer season and each period of no weed control and weed control in the autumn season. These data were used to determine the relative indexes of density,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sorghum bicolor; Weeds; Weed competition.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100249
Registros recuperados: 7
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