The use of growth regulators in wheat crop is a usual practice, and one of its effects is the changing in plants architecture, what may interfere in the early season for weeds control. With the objective of evaluating the influence of growth regulator (trinexapac-ethyl) effect over agronomic characteristics and wheat yield, in order to determining the best period to initiating weeds control in wheat crop, an experiment was conducted in Ponta Grossa County, Parana State in 2011 agricultural year. Experimental […]

The objective of this study was to evaluate the effect of doses of paraquat and glyphosate on desiccation Brachiaria ruziziensis. The experimental design was randomized blocks with four replications. The rates glyphosate were 0, 90, 180, 360, 720 and 1440 g ha-1 and paraquat were 0, 50, 100, 200, 400 and 800 g ha-1. Based on the results obtained it can be concluded that paraquat was ineffective in desiccation B. ruziziensis and the glyphosate was only effective at rates of […]

The 2,4-D has been one of the most widely used herbicide in combination with glyphosate, especially in applications desiccation pre-planting. The objective of this study was to evaluate the effect of adding 2,4-D to glyphosate for the control of weed species considered difficult to control (Commelina benghalensis, Richardia brasiliensis, Euphorbia heterophylla, Spermacoce latifolia, Ipomoea grandifolia e Conyza spp.). The experimental design was completely randomized, and treatments were arranged in a 3 x 4 factorial design with four replications. The first […]

This research aimed to evaluate the selectivity and efficacy of glyphosate tank mixture with different post- emergent herbicides on controlling Commelina benghalensis in soybean RR® crop. The experiment was conducted in field conditions using complete randomized block design, with four replications, where the treatments were four rates of cloransulam-methyl herbicide (10, 20, 30 and 40 g ha-1), four rates of chlorimuron-ethyl herbicide (2.5; 5.0; 7.5 and 10 g ha-1), imazethapyr at 100 g ha-1 and lactofen at 72 g ha-1, […]

The winter field system has impacted the Conyza spp. infestation on the next Field. Thus, the aim of the research was evaluate burndown efficacy to Conyza spp. control in wheat crop area during the winter season, as well as at monitoring the residual effect of herbicides in soil on weed control within soybean cycle. The same experiment was conducted in two locations during the months of November 2010 and January 2011, in two locations in Rio Grande do Sul state […]

The straw left on the soil surface after the sugarcane mechanical harvest affects directly the weed infestation, due to, among others, the limitation of temperature variation on the seed bank, the formation of a physical barrier which enables weed emergence, and the possible allelopathic effect of the sugarcane straw. On the other hand, the straw also works as a barrier to the herbicide until it is leached into the soil. The objective of this study was to test the effect of herbicides amicarbazone and imazapic applied on different amounts of straw for the control of Luffa aegyptiaca, Ipomoea hederifolia and Bidens pilosa. Two herbicides – amicarbazone and imazapic were tested at three different rates: 1008 g a.i. […]

The objective of this study was to evaluate the efficiency of ammonium-glufosinate in management programs for weeds in cotton crop FiberMax 966 Liberty Link® genotype. The experiment was installed in experimental area of Paiaguás Farm, located in municipality of Diamantino, Mato Grosso State. The experiment was conducted in a randomized block design with eight treatments and four replications. For weeds efficient management in FiberMax 966 LL genotype, the application of herbicide treatment in pre-emergence may reduce up to two post-emergence […]

Chemical control of weeds in sugarcane crop may be performed in dry season, mainly due to agricultural operations planning, and logistics in relation to the use of equipment and labor. This study aimed to evaluate the agronomic efficacy of herbicides for controlling sugarcane grass weeds by using different periods of water restriction. Evaluated weeds were Digitaria nuda, Panicum maximum and Brachiaria decumbens. Herbicides treatments applied in total pre-emergency condition were: diuron + hexazinone + sulfometuron-methyl (1387 + 391 + 33.35; […]

This study aimed to evaluate the weed control with the herbicide diuron sprayed in pre- and post-emergence, either under shade or full sun. It was studied the effect of the diuron at in the formulation 500 SC at 3.2 and 4.8 L ha-1 of the trade product on the plants of Euphorbia heterophylla, Ipomoea grandifolia and Raphanus raphanistrum sprayed in pre-emergence, as well as the same doses sprayed in post-emergence on plants of E. heterophylla, I. grandifolia and Senna occidentalis. […]

The accompaniment of cultivated areas with cotton Liberty Link genotype (LL®) in Brazilian Cerrado-like vegetation has conducted to the observation that amonio-glufosinate isolated does not have proportionate the adequate weeds control commonly found in these areas, becoming clear the necessity of several control interventions until crop closing. The objective of this work was to verify the benefits in associating pyrithiobac-sodium to applications carried with amonio-glufosinate in cotton Liberty Link genotype (LL®) for controlling and reducing weeds new infestation. The experiment […]