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 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) […]

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 […]

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 […]

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 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 […]

This study aimed to evaluate the effectiveness of herbicides in controlling soybean volunteer plants resistant to glyphosate. The experiment was conducted in field conditions by using randomized complete block design in factorial scheme 6×9, with four replications, with the first factor represented by six soybean genotypes resistant to glyphosate herbicide (BRS Favorita RR® , BRS Valiosa RR® , CD 219 RR® , M-SOY 7908 RR® , P98Y11® and P98R31® ) and the  second factor represented by herbicides sprayed isolated or […]

This study aimed to evaluate the effects of glyphosate sub doses in genipap (Genipa americana L.) young plants. One year after seedlings planting, three glyphosate sub doses were tested, being: T1 – 86.4, T2 – 172.8 and T3 – 345.6 g i.a. ha-1 and T4 – Check (without application). At 7, 14, 21, 28 and 120 days after herbicide application (DAA) scores were provided for visual phytotoxicity, and in the first and in the last evaluation, measurements of plant height […]

Two experiments were conducted simultaneously with the objective of evaluating the selectivity of nicosulfuron and chlorimuron-ethyl herbicides, applied in post-emergence at two developmental stages in alfalfa crop. Trials were conducted in greenhouse conditions in randomized entirely design, with five replications, in a 4 x 2 factorial scheme. The factors corresponded to the application of chlorimuron-ethyl herbicide at 0, 7.5, 15 and 30 g ha-1 (Trial 1) and nicosulfuron at doses of 0, 20, 40 and 80 g ha-1 (Trial 2). […]

Using bioindicator species is really common in studies concerning herbicides behavior in soil. Trifloxysulfuron-sodium and pyrithiobac-sodium are herbicides recommended for post-emergence weed control in cotton crop and present potential carryover to rotational crops. The research aimed to evaluate the susceptibility of vegetal species to doses of trifloxysulfuron-sodium and pyrithiobac-sodium herbicides looking forward to selecting plants that may be used in monitoring low concentrations of these herbicides in soil. Two experiments were simultaneous carried out, in randomized entirely design, disposed in […]