The study aimed to evaluate the efficiency and residual effect of herbicides, applied in management operations, in modalities “Apply-Plant” and “Anticipated Management” in soybean crop. The experimental design was randomized complete blocks with four repetitions in 8 x 2 factorial scheme, with eight herbicides associations (with flumioxazin, chlorimuron-ethyl and glyphosate) in two management systems. For “Anticipated Management” was conducted glyphosate application 20 days before sowing, with treatments being applied two days after planting. For “Apply-Plant” system, treatments were applied one […]

The presence of Bidens pilosa and Euphorbia heterophylla resistant to ALS inhibitors is a problem to weed management in cotton crop, due to the fact that few alternatives broadleaf selective herbicides area available. In order to supply this information gap, four experiments were established in greenhouse conditions with the objective of evaluating herbicides applied in post-emergence conditions, recommended either for conventional and transgenic cotton (resistant to glyphosate and amonio-glufosinate) for controlling these resistant biotypes. The experimental design was entirely randomized […]

Studies on chemical management of green manure are scarce in national literature. This work aimed to evaluate the herbicides efficiency in chemical control of green manure used in succession with sugarcane crop, in minimum cultivation system. Two experiments were conducted with Mucuna aterrima and Crotalaria spectabilis species, arranged in a randomized complete block design with 19 treatments and four replicates. The treatments were composed by three distinct rate for herbicides: glyphosate+2,4-D+carfentrazone-ethyl; glyphosate+2,4-D; glyphosate+MSMA; 2,4-D+carfentrazone-ethyl; 2,4-D; 2,4-D+picloran and check without herbicide […]

Adequate planting depth is one of the most important factors in germination and seedling emergence, thereby ensuring a uniform stand. Thus, this study aimed to evaluate the effect of sowing depth in cotton crop (Delta Opal var.), over diuron, oxyfluorfen, alachlor, clomazone, pendimetalin, S-metalachlor, prometryne and trifluralin herbicides plant toxicity. Evaluations on crop toxicity were carried out at 7, 10, 12, 14, 17, 19, 21, 28 and 35 days after herbicide application (DAA), through EWRC scale and total dry mass […]

This study aimed to evaluate the phytotoxic effects of glyphosate increasing doses in Aspidosperma desmanthum Benth. ex Müll. Arg. young plants. Doses of glyphosate applied one year after planting were: T1 – 86.4, T2 – 172.8, T3 – 345.6 g i.a ha-1 and T4 – check (without application). Evaluations of visual phytointoxication were conducted at 7, 14, 21, 28 and 180 days after application (DAA) of herbicide, in order that in the first and last evaluations measures of trunk diameter […]

The lack of information on herbicides selective for cultivation of physic nut makes it difficult to tame the chemical control of weeds, especially during the initial stage of the crop. Therefore, the objective of this study was to evaluate the selectivity of herbicides applied in post-emergence to the culture of physic nut (Jatropha curcas L.). We used experimental design completely randomized with 16 treatments and 11 repetitions, three herbicides in five doses and a control without herbicide. The doses of […]

This work was aimed to evaluate the selectivity of main herbicides used in sugar cane crop applied in pre or post emergence conditions to common bean (“Jalo” Group – cultivar “Jalo Precoce”). In pre emergence modality the treatments evaluated consisted of: ametryn (2.500 g ha-1), tebuthiuron (800 g ha-1), [hexazinone + diuron] (237.6 + 842.4 g ha-1), metribuzin (1,440 g ha-1), clomazone (800 g ha-1), isoxaflutole (112.5 g ha-1), sulfentrazone (600 g ha-1), imazapic (105 g ha-1), trifluralin (1,800 g […]

The objective of this work was to assess the photosynthetic efficiency of sugarcane crop, in pre-emergency application, of two inhibiting photosynthesis herbicides. For sugar cane cuttings planting (SP80-3280 genotype), pots with a capacity of 8 dm3 were used. Atrazine and tebuthiuron application was performed by using a stationary spray installed in laboratory conditions and after treatment application, plants were transported to a green house where were kept until the end of the trial. The reading of electrons transport rate (ETR) […]

There are indications that glyphosate could affect the phosphorus nutrition of soybean. Thus the present study was to evaluate P uptake absorption and allocation in soybean after glyphosate application. Two experiments were conducted in green-house in randomized complete block. The 1st experiment evaluated the glyphosate at 0,0; 1,5; 3,0; 6,0 and 12,0 g ha-1 and the 2nd experiment evaluated the glyphosate at 0,0; 200; 400 and 800 g ha-1. Glyphosate was applied at 21 days after plant emergence in foliar […]

The present review aimed to collect information from main studies about carryover effect of some herbicides in different crops. Therefore, some relevant subjects were discussed to better understand herbicide dynamics in soil such as the ionization equilibrium constant (pKa/pKb), octanol/water partition coefficient (Kow), solubility, vapor pressure, Henry’s constant (H), half-life and the interaction among these properties. From these points, it was developed the review about the residual effects of several herbicides such as imazaquin, imazethapyr, sulfentrazone, nicosulfuron, fomesafen and other, […]

The work aimed to evaluate, in sugar cane crop, the selectivity and effectiveness of S-metolachlor herbicide associated to ametryn and [hexazinone+diuron], applied terrestrial and aerial forms, in pre and post emergent weeds control. The experimental design used in experiment 1 (terrestrial application) was randomized complete blocks with 16 treatments and four repetitions, applied in pre and post emergence:  S-metolachlor + ametryn (1920 + 1500;  2400 + 1500 and 2880 + 1500 g a.i. ha-1; S-metolachlor + [ hexazinone+diuron ] (1440 […]