Interferência das plantas daninhas no amendoinzeiro

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Fitossociologia e períodos de convivência e de controle de plantas daninhas em soja transgênica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influência das plantas daninhas na cultura do feijoeiro em função do espaçamento e da densidade de plantas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeito da época e local de semeadura na interferência das plantas daninhas na cultura do amendoim

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeito de diferentes períodos de convivência com as plantas daninhas sobre a produtividade da cultura da cenoura (Daucus carota L.)

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Períodos de interferência de plantas daninhas em cultivares de girassol

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Períodos de interferência de plantas daninhas em algodoeiro cultivares BRS Safira e BRS Verde

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Otimização da aplicação de Fluazifop-P-Butil em pós-emergência na cultura de soja (Glycine max)

The objective of this study was to evaluate the possibility of reducing spray concentration and volume of Fluazifop-p-butyl applications on postemergence soybeans, while maintaining weed control and growth selectivity. The study was conducted in the experimental area of the Teaching and Research Farm of FCAV/Unesp - Jaboticabal Campus, during the agricultural season of 1998/99, carried out on a crop of soybean cultivar FT 2009. The experimental setup utilized was a randomized block design with 24 treatments, 20 following a factorial scheme 2 x 2 x 5 and 4 control treatments. The factors examined were: spray volume (100 and 200 L ha-1); reduced spray concentration - 75.2 and 112.8 g of fluazifop-p-butyl/ha (40 and 60% of the recommended concentration, respectively); and application schedule (5 A.M., 9 A.M., 1 P.M., 5 P.M. and 9 P.M.). The controls were applications at the recommended concentration (188.0 g fluazifop-p-butyl/ha), using volumes of 100 and 200 L ha-1, and treatments without weed control and weeds controlled with manual hoeing. The main species of weeds that emerged in the experimental area were: Cenchrus echinatus, comprising 60% of the infested sections; Digitaria horizontalis, 10%, and Eleusine indica, 30%. All fluazifop-p-butyl applications made up to 9 A.M. and from 5 P.M. effectively controlled the three species of weeds and provided a selective growth of soybeans. Therefore, the use of fluazifop-p-butyl can be optimized by reducing both the concentration and the volume of the spray for applications times providing favorable conditions for crop dusting.

Épocas e extensões do período de convivência das plantas daninhas interferindo na produtividade da cultura do milho (Zea mays)

Q field experiment was carried out at the Gralha Azul Experimental Farm/PUCPR, in the municipality of Fazenda Rio Grande-PR, to evaluate the effect of different times and coexistence extension periods of weeds interfering in corn yield. The experiment was arranged in a complete randomized complete block design and the treatments in a 4x5+2 factorial, with four replications. The treatments were as follows: four initial weed control periods (0-0, 0-7, 0-14 and 0-21 DAE) and five restarted weed control periods until the harvest (28, 42, 56, 70 and 84 DAE) and two checks, weedy and weed-free. The experiment was carried out under a no-till system. The period prior to weed interference (PBWI), the start of the critical period of weed interference (CPWI) and the infesting community were evaluated. When the initial weed control period was 0-0 day, the PPWI was at 9 DAE of corn; however, with increasing initial weed control periods (0-7, 0-14 and 0-21 DAE) the period prior to weed interference inncreased in relation to 0-0 day of the initial weed control, evidencing the existence of PPWI-S of 17, 24 and 28 DAE of corn, respectively. Thus CPWI initiates at the end of PPWI-S, the period when weed control is indispensable to prevent a significant reduction in corn yield. Coexistance with the weeds throughout the crop cycle reduced yield in 15%, compared to the weed-free check. Nine species of seven botanical families were assessed in the infesting community. Reduced density and dry mass were verified in the weeds that coexisted with corn, compared to those that grew without it, thus evidencing a suppressive effect of corn over the infesting plants.

Infestação de plantas daninhas em canaviais: efeito do ambiente de produção e do sistema de colheita, potencial alelopático de cultivares e da benzoxazolinona

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Espacialização do banco de sementes de plantas daninhas sob diferentes manejos de cana-de-açúcar em Rio Brilhante, Mato Grosso do Sul

The State of Mato Grosso do Sul is in full growth of this sector, thus the concern about harvesting systems are being studied, and these systems may influence the weed community interference of weeds in the cane sugar. The integrated management tool attached to geostatistics is to avoid productivity losses due to weed interference. The objective of this work was to study the spatial variability of the seed bank of weeds depending on the system for collecting cane sugar (raw and burning). The experiment was conducted in the area of commercial cultivation of the plant ETH Bioenergy S/A Eldorado Unity. Soil samples were taken with auger layer from 0.00 to 0.40 m depth in both cropping systems. The experimental plot was composed by a mesh consisting of 50 points georeferenced with irregular distances. Soil samples were taken to the greenhouse for germination. The number of weed species was analyzed using descriptive statistics and geostatistical techniques. The seeds of B. pilosa, dicots, bitter grass, nutsedge, dayflower monocots and spatial dependence of the seed bank in the collection system with burning of cane sugar. For the system of harvest only the raw sedge species present spatial dependence of distribution in the seed bank. In the harvest green cane enable the mapping of these species through the kriging maps produced, spot applications of herbicides in integrated management of Cyperus rotundus.

Período anterior à interferência de corda-de-viola em cana-planta

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Períodos de interferência de Mucuna aterrima (Piper & Tracy) em cana-de-açúcar e seu controle químico

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Interferência das plantas daninhas na nutrição e produtividade da cultura da berinjela cultivar 'Nápoli' com e sem tutoramento e desbrota

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Interação entre Sorgo Sacarino e plantas daninhas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)