An experiment was conducted in green house, with the objective of evaluating the efficacy of amicarbazone herbicide in controlling Brachiaria plantaginea and Digitaria spp., in function of germination depth and soil humidity conditions. Treatments were constituted by five germination depths of weeds (1; 2; 3; 4 e 5 cm) and four humidity conditions (15 mm of rainfall followed by herbicide application; 15 mm of rainfall, followed by herbicide application and 15 mm of rainfall after 7 days after application (DAA); […]

The use of herbicides for weed control have improved in the last years, mainly for the control of purple nutsedge (Cyperus rotundus L.) and other perennial weeds. In order to study the control of purple nutsedge, sulfentrazone and flazasulfuron isolated and in mixture, were applied in field conditions with high infestation of this species and repeated on the second year. The variable analysed were viability of the tubers of C. rotundus at 90 and 300 DAT in 2004 and at […]

The breath test is a indirect biochemical test that means to measure the amount of oxygen consumed, has been extensively used in measuring the respiration rate of seeds and soil respiration. The objective was to develop and validate a methodology to assess sprouting of purple nutsedge (Cyperus rotundus) tubers by breathing test. In order to develop the methodology, tests were carried out with the objective of homogenizing the sprouting. In these tests the tubers suffered a preconditioning with glucose, gibberelic […]

Different weeds species are present in Brazilian sugar cane areas interfering negatively in productive process, and morningglory species, Ipomoea sp. and Merremia sp., are outstanding, particularly in raw cane areas. This way, the objective of this study was to verify the effectiveness of amicarbazone herbicide in controlling Ipomoea grandifolia and Merremia cissoides species, applied in post emergency and compared to 2,4-D herbicide. So, it was conducted an experiment, in green house conditions, in pots, with Latossoil Red distrofic (LRd), seeded with […]

This work aimed to develop and to validate a methodology based on tetrazolium test to determine the viability of purple nutsedge tubers (Cyperus rotundus). The treatments for methodology development were combined in factorial design 3 x 4 x 5, three tubers conditions (dead as control, conditioning with water and conditioning for loss of moisture), four concentrations of tetrazolium (0.1, 0.25, 0.5 , and 1%) and 5 assessment periods (8, 16, 24, 32 and 48 hours after immersion in solution). For […]

Amazonian native plant, Ananas erectifolius has been a specie of great interest for automobile industry, due to the fibers contained in its leaves that show resistance, softness and reduced weight. Some studies about simulation of glyphosate drift have been demonstrating the occurrence of tolerance and/or incentives of dossel growth of some vegetable species. This way, with the objective of evaluating the effects of glyphosate subdoses application in growth, development and yield of Ananas erectifolius an experiment was conducted in field […]

The use of herbicides with residual activity in weed management has become a common practice in order to reduce weed initial competition. This study aims to evaluate the selectivity and efficiency of the sulfentrazone + glyphosate association at pre-planting management, supplemented with postemergence glyphosate. To reach such intent, an experiment was conducted in Bandeirantes – Pr, on a Eutrophic latosol. The experimental design was randomized blocks in split plot scheme with 11 treatments and 04 replicates. The main weeds in […]

The objective of this work was to evaluate the interactions among sugarcane mulch residue, the herbicide sulfentrazone and different application methods of vinasse, a sugarcane industry residue, on the initial development of purple nutsedge (Cyperus rotundus L.). A greenhouse experiment was set up using pots with soil, in randomized complete blocks, with four replications and the following treatments were studied: control (C), straw alone (P), vinasse alone (V), herbicide alone (H), straw + vinasse (PV), straw + herbicide (PH), herbicide + […]

The present work was aimed to evaluate the selectivity and efficiency of herbicides mixtures in sugar cane variety RB 83-5486. Four experiments were carried out in Nova Londrina (PR) and Marilena (PR). In each locality were developed two experiments. The experiments were conducted in randomized blocks, with nine treatments and four replications. In all experiments, the treatments were applied in pre-emergence: T1 (tebuthiuron) + (hexazinone + diuron), T2 (clomazone + ametrina) + (clomazone), T3 (clomazone + ametrina), T4 (trifloxysulfuron sodium […]

With the aim of evaluate the efficiency and the selectivity of the tembotrione herbicide, isolated and complemented with atrazine, in the weeds control of the corn culture, an experiment was installed at the UEPG School Farm, in the 2004/05 agricultural year. The experimental design was a complete randomized blocks with nine treatments and four repetitions. The treatments consisted of the postemergence application of Equip Plus (foransulfuron & iodosulfuron methyl sodium) – 0,12 L ha-1 complemented with Atrazinax (atrazine) – 2 […]