Corn stands out among the cultivars because of its high importance in food, animal feed and raw materials for energy production. The quantity quality harvested grain can be reduced, mainly due to inadequate weed management. Nowadays, control is accomplished with use herbicides as pre‐emergence postemergence, applied alone or a tank mix. This study aimed evaluate efficiency weeds phytotoxicity that were mix isolated corn hybrids, Formula TL® SYN 7B28 . Two experiments conducted: 2012/2013...

The study of weed interference periods and the economic threshold level (ETL) weeds on crops allows adoption management methods rationalized use herbicides. objective this was to determine test mathematical models ryegrass in wheat crop. Two experiments were carried out a randomized block design with four replications. first experiment conducted 2014/2015 agricultural season. control studied wheat. and/or were: 0, 10, 20, 30, 40, 50 120 days after emergence (DAE). second 2016/2017 ETLs...

ABSTRACT The aim of the study was to assess interference and determine economic threshold level beggartick damage on bean crops. Treatments consisted cultivars (IPR Uirapuru, BRS Supremo, Campeiro, Fepagro 26, Esplendor IPR Tuiuiú) submitted competition with ten populations. We evaluated plant population, leaf area, ground cover shoot dry mass beggartick. Dry shoots fitted better hyperbolic model, grain yield losses due were estimated satisfactorily by this model. Tuiuiú more competitive...

Abstract: The objective of this work was to evaluate the density and composition soil weed seed bank when bean, corn, soybean are cultivated in no-tillage system (NTS) rotation with winter cover crop species conventional tillage (CTS). experiment installed a complete randomized block design three replicates. evaluation performed on samples (0-10 10-20 cm) four points each experimental unit, at 15, 30, 60, 90 days cultivation. Bean, crops were sown NTS different rotation, as well CTS....

ABSTRACTThe objective of the study was to assess relative competitive ability canola hybrids in presence turnip (Raphanus sativus) and ryegrass (Lolium multiflorum) different ratios plants mixture. The experiments were conducted a greenhouse, completely randomized design with four replications. Treatments arranged against or ryegrass: 100:0, 75:25, 50:50, 25:75 0:100. Competitive analysis species accomplished by means diagrams usually applied replacement series also competitiveness indices....

Determination of interference periods, competitive ability and economic threshold level (ETL) are important tools for integrated weed management (IWM) in barley.The objective the work was to determine periods interference, ETL weeds barley (Hordeum vulgare).Two field experiments were carried out, a randomized block design, with four replications.In this study, coexistence control ryegrass (Lolium multiflorum) turnip (Raphanus raphanistrum) infesting cultivar, cv.ANA 01 evaluated.The and/or...

Ryegrass and turnip are weeds that cause high yield losses when infesting barley, thus requiring adequate management. In this context, the aim of study was to evaluate selectivity different herbicide treatments weed control in barley crop, cultivar BRS Cauê. Two field experiments were conducted randomized blocks, with four replications. The used were: pendimethalin (800 g·ha-1), sulfentrazone + diuron (175 350 imazaquim (150 g·ha-1 a. e.) applied pre-emergence; iodosulfuron (3.5 pyroxsulam...

The objective of this work was to evaluate the effectiveness, selectivity and effect on yield components RR® maize as a function herbicide application, applied alone or in tank mix. experiment conducted randomized block design, with four replications, treatments were control without weeding, glyphosate, glyphosate + [atrazine+simazine], [atrazine simazine], tembotrione, glyphosate+mesotrione, T8-glyphosate nicosulfuron, 2,4-D, S-metolachlor], T11-glyphosate (atrazine S-metolachlor),...

The objective this work was to evaluate the agronomic performance of beans, corn and soybean cultivated under no - tillage system conventional management. consisted 12 experiments, divided three agricultural crops, with cultivation species vegetal cover in a consortium or an isolated way, later sowed summer besides crop preparation, where soil remained fallow during winter period. Aerial dry mass yield components maize were evaluated. turnip along present those that demonstrated lower...

ABSTRACT: Phytosociological studies are groups of methods that aim at the identification, composition and distribution plant species in a community. The objective this study was to identify quantify main weeds found beans, maize soybean cultivated no-tillage conventional systems. experimental design randomized block one, with four replications. Experiments were conducted during three consecutive years, summer crop (bean, soybean) treatments, system (NTS) composed by covers, black oat, vetch...

Objetivou-se com o trabalho avaliar a habilidade competitiva relativa de cultivares arroz na presença um biótipo angiquinho (Aeschynomene denticulata) em diferentes proporções substitutivas plantas associação. Os experimentos foram instalados no delineamento blocos casualizados, quatro repetições. Primeiramente, tanto para quanto angiquinho, determinou-se população que produção final massa seca se torna constante (24 vaso–1). Posteriormente instalaram-se dois competitividade das BRS...

Among the factors that affect potato productivity, interference caused by weeds stands out as they may compete with crop, release allelopathic substances to soil and host insects diseases. Therefore, objective of this work was assess competitive ability white (Aghata) pink (Asterix) cultivars when infested Alexandergrass (Urochloa plantaginea) or wild poinsettia (Euphorbia heteroplylla). The experiment carried into greenhouse in randomized blocks design, four replications. A single plant...

ABSTRACT This study aimed to evaluate the competitive interaction between maize hybrids in presence of Digitaria insularis through experiments a series substitutions. The were conducted randomized block design with four replicates. Six used, and plant density D. was set for constant final production 463 plants m-2. Competition had detrimental effect on growth both species. demand environmental resources same competing insularis. negative physiological characteristics hybrids, regardless...

The weeds if not properly controlled have great ability to settle in agricultural systems, affecting crop production. objective of this work was determine the interference and level economic damage different density crop. treatments were composed canola hybrids (Hyola 50, Hyola 76, 433, 571 CL, 575 CL Diamond) twelve infestation turnip variables evaluated estimate competitiveness plant density, leaf area, soil cover dry mass turnip. Grain yield, price, herbicide efficiency, control cost used...

Among the factors which affect crop productivity, there are weeds compete for environment resources. The objective of this work was to determine periods interference alexandergrass on morphophysiology and productivity components black beans. experiment conducted in a complete randomized block design with four replications. bean cultivar type used IPR Uirapuru, being treatments separated two models interference: coexistence group, lived by growing 0, 7, 14, 21, 28, 35, 42 throughout cycledays...

Competition between crops and weeds interfere on growth development with harm to one or both, in different ways. To quantify these differences competition, additive replacement series study methods are most often used, each characteristics goals. Therefore, we aimed this work inter-specific competition plants of soybean corn against the Bidens pilosa (beggartick) Digitaria insularis (sourgrass), by two experimental study: (substitutive) experiments. Initial tests were performed prior...

Objetivou-se com o trabalho identificar alternativas para manejo químico de plantas daninhas infestante do trigo, bem como verificar a fitotoxicidade herbicidas sobre cultura. Instalou-se experimento em blocos casualizados, arranjado esquema fatorial 2 x 13, quatro repetições. No fator A, alocou-se as cultivares trigo (Quartzo e Pioneiro) no B os (iodosulfuron – 0,100 kg ha-1; imazapic + imazapyr 0,140 clomazone 0,800 L imazethapyr 1,250 propanil 6,000 oxyfluorfen 1,000 penoxsulam 0,175...

The growing global demand of energy, the decrease petroleum reserves and current environmental contamination problems, make it imperative to study renewable energy sources for use in internal combustion engines, order dependence on fossil fuels reduce emissions pollutant gases. This aimed evaluate a diesel-cycle engine an agricultural tractor that uses diesel S500 (B5) mixed with 3, 6, 9, 12 15% hydrous ethanol. It determined CO2 (ppm), NOx opacity (k value) A standard procedure was applied...

When plants are subjected to competition, their physiological behavior changes. To understand the developmental physiology of weeds will subsidize development cropping systems which favor crops in detriment weeds. The objective this work was evaluate different weed species, growing under intraspecific competition. Greenhouse experiment conducted randomized complete block design arranged factorial scheme 4 × 5 with four replications. Factor A species [Urochloa plantaginea (Alexandrergrass),...

The objective of this work was to evaluate the selectivity herbicides applied alone or in tank mix, and also combinations different classes pesticides (fungicides, insecticides) on corn. An experiment installed 2017/18 crop assess herbicide selectivity, repeated 2018/19. second aimed mixtures pesticides, only 2017/18. experimental design adopted tests randomized blocks, with four replicates. In each trial, a total 16 treatments were evaluated, plus control. At 7, 14 21 days after application...

Objetivou-se com este trabalho avaliar a resposta competitiva de genótipos arroz na presença um biótipo papuã (Brachiaria plantaginea), em diferentes proporções plantas associação. O delineamento experimental adotado foi o completamente casualizado quatro repetições. Os tratamentos foram arranjados série substituição e constituíram-se cinco do associação (100:0, 75:25, 50:50, 25:75 0:100). Aos 50 dias após emergência das espécies, efetuou-se aferição perfilhamento, da estatura, área foliar...

Resumo: O objetivo deste trabalho foi quantificar o efeito do tipo de diesel e da concentração biodiesel na mistura combustível sobre as emissões gases por motor agrícola submetido a diferentes cargas. Foram testados dois tipos diesel: S10, com baixo teor enxofre; S500, alto bem como suas misturas 5, 10, 15, 20, 50 100% biodiesel. motor, quatro cilindros, turboalimentado 105 cv potência máxima, oito modos operação, sob rotações torques. ensaio seguiu metodologia prevista norma NBR ISSO...

ABSTRACT The objective of the study was to evaluate competitive ability summer crisp and butterhead lettuce types in coexistence with populations ryegrass. experimental design completely randomized a factorial 2 x 7 scheme, four replications. On A factor (summer butterhead) were allocated and, on B, densities ryegrass (0, 2, 4, 8, 16, 32 64 plants per pot). number leaves, chlorophyll content, leaf area, green mass dry evaluated, diameter culture stem tiller weed determined. Differences...

O uso intensivo e repetido do método químico de controle na cultura trigo selecionou populações nabo (Raphanus raphanistrum R. sativus) azevém (Lolium multiflorum) resistentes a alguns herbicidas, em especial aos inibidores das enzimas ALS, ACCase EPSPs. Para manejar as plantas daninhas resistentes, é importante rotacionar os mecanismos ação tanto dessecação como nas aplicações realizadas após implantação da cultura. Assim, objetivou-se com este trabalho avaliar eficácia herbicida clomazone...

The lack of knowledge management in the application yerba mate is reason for present study, given economic importance this crop family farming, economy and also culture southern region Brazil. objective work was to evaluate effects winter cover species on morphophysiological characteristics seedlings. experimental design laid out randomized blocks with four replicates. weed used were Avena strigosa, Lolium multiflorum, Vicia sativa, Raphanus sativus, Lupinus albus, Axonopus catharinensis,...