Effects of straw decomposition degree on leaching and weed control efficacy of tebuthiuron and hexazinone in green sugarcane harvesting

Toniêto, Thiago Antônio Pinheiro; Regitano, Jussara Borges

doi:10.1590/s0100-83582014000400016

Cited by 8 publications

(6 citation statements)

References 13 publications

(9 reference statements)

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“…Therefore, the straw left on the soil surface in greencane harvesting systems seems advantageous from an environ- mental point of view because it attenuates groundwater contamination risks by highly mobile herbicides, such as tebuthiuron and hexazinone. 47 These results are in disagreement with those from sorption, suggesting that straw presence did not considerably affect our herbicides' mobility. HA application appeared to have increased hexazinone retention to the straw and, as a result, decreased its leaching apart from the formulation (although differences were not statistically significant).…”

Section: ■ Results and Discussioncontrasting

confidence: 56%

“…Even after 100 mm of rain, ∼40% of both applied herbicides remained intercepted in the straw, which differs from sorption expectations, mainly for hexazinone (Figure ). Therefore, the straw left on the soil surface in green-cane harvesting systems seems advantageous from an environmental point of view because it attenuates groundwater contamination risks by highly mobile herbicides, such as tebuthiuron and hexazinone . These results are in disagreement with those from sorption, suggesting that straw presence did not considerably affect our herbicides’ mobility.…”

Section: Results and Discussionmentioning

confidence: 89%

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Fate of Tebuthiuron and Hexazinone in Green-Cane Harvesting System

Toniêto

Pierri

Tornisielo

et al. 2016

J. Agric. Food Chem.

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In Brazil, fire prior to sugar cane harvesting has to be phased out by 2017, but it has already been phased out in up to 85-90% of the cropped area. The new system is called green cane and has entirely changed weed management practices. The main goal of this study was to evaluate the effects of the straw presence as well as humic acid (HA), formulation, soil type, and aging on the sorption and leaching of (14)C-tebuthiuron and hexazinone. Both herbicides presented low sorption for all treatments (Kd,app ≤ 3.25 L kg(-1)), but it was higher for tebuthiuron in the clayer soil (LVd). Straw and aging only slightly enhanced sorption. The HA effects were not clear. Sorption was mostly affected by herbicide and soil type. Straw may promote physical trapping (∼40% of applied amount), which cannot be accessed by "batch" sorption (∼15% of the applied amount is sorbed), attenuating leaching of highly mobile herbicides in green-cane systems. To properly assess leaching through straw residues under laboratory condition, rainfall distribution is very important.

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Section: ■ Results and Discussioncontrasting

confidence: 56%

Section: Results and Discussionmentioning

confidence: 89%

Fate of Tebuthiuron and Hexazinone in Green-Cane Harvesting System

Toniêto

Pierri

Tornisielo

et al. 2016

J. Agric. Food Chem.

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“…Despite the numerous agricultural and environmental benefits and functionalities of straw [18], its presence has a significant impact on the transport of herbicides into the soil. This is due to the herbicides adhering to the surface of the straw, which compromises the management of difficult-to-control weeds and significantly influences the final fate of herbicides in the environment [19,20]. This influence arises from the increase in the soil organic matter content, leading to a strong sorption of herbicides [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a System to Assess Herbicide Movement in Straw under Dry and Wet Conditions

Thais dos Santos,

Ferraz Santos de Brito,

Alves de Matos

et al. 2024

AgriEngineering

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Straw from no-till cropping systems, in addition to increasing the soil organic matter content, may also impede the movement of applied herbicides into the soil and, thus, alter the behavior and fate of these compounds in the environment. Rain or irrigation before or after an herbicide treatment can either help or hinder its movement through the straw, influencing weed control. Our objective was to develop a system for herbicide application and rain simulation, enabling the evaluation of the movement of various herbicides either in dry or wet straw under different rainfall volumes (25, 50, 75, and 100 mm). The amount of the applied herbicides that moved through the straw were collected and measured using a liquid chromatograph with a tandem mass spectrometry system (LC-MS/MS). Measurements obtained with the developed system showed a high herbicide treatment uniformity across all replications. The movement of the active ingredients through the straw showed variability that was a function of the applied herbicide, ranging from 17% to 99%. In wet straw, the collected herbicide remained constant from 50 to 100 mm of simulated rainfall. For the wet straw, the decreasing percentages of the herbicide movement through straw to the soil were sulfentrazone (99%), atrazine and diuron (91% each), hexazinone (84%), fomesafen (80.4%), indaziflam (79%), glyphosate (63%), haloxyfop-p-methyl (45%), and S-metolachlor (27%). On the dry straw, the decreasing percentages of the herbicide movement were fomesafen (88%), sulfentrazone (74%), atrazine (69.4%), hexazinone (69%), diuron (68.4%), glyphosate (48%), indaziflam (34.4%), S-metolachlor (22%), and haloxyfop-p-methyl (18%). Overall, herbicide movement was higher in wet straw (with a previous 25 mm simulated rainfall layer) than in dry straw. Some herbicides, like haloxyfop-p-methyl and indaziflam, exhibited over 50% higher movement in wet straw than dry straw after 100 mm of simulated rain. The developed system can be adapted for various uses, serving as a valuable tool to evaluate the behavior of hazardous substances in different agricultural and environmental scenarios.

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“…Hexazinone is an herbicide of the triazinone chemical group used in sugarcane crops (TONIETO & REGINATO, 2014). According to Santos et al MARTINS (2015), the study and assessment of the risks of this compound in the environment are relevant because it presents moderate solubility in an aqueous medium.…”

Section: Introductionmentioning

confidence: 99%

Selection of microorganisms and preparation of inoculants with potential applications in the remediation of soil contaminated with hexazinone

et al. 2021

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The excessive use of agrochemicals negatively impacts the environment, making the development of sustainable technologies for the reduction of contaminants in soil necessary. Hexazinone is the herbicide most used for sugarcane crops and persists in the environment. Moreover, its main route of degradation in the soil is through microorganisms. Therefore, six microorganisms were selected that presented growth in the presence of the herbicide; SCR1 - Microbacterium arborescens; SCR2 - Bacillus pumilus; SCM3 - Stenotrophomonas maltophilia; SCM4 - Bacillus cereus; SCM5A - M. arborescens; and SCM5B - B. safensis. A test was performed to evaluate the ability of each lineage in phosphate solubilization. For the Ca3(PO4)2 solubilization test, the strains that showed the best results were B. pumilus and S. maltophilia. Subsequently, the inoculants were prepared and the concentrations after plating were 2.71 × 109 CFU mL-1 for B. pumilus, 1.02 × 109 CFU mL-1 for S. maltophilia, and 1.14 × 1010 CFU mL-1 for a combination of the two strains. These were satisfactory values for use as inoculants.

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Effects of straw decomposition degree on leaching and weed control efficacy of tebuthiuron and hexazinone in green sugarcane harvesting

Cited by 8 publications

References 13 publications

Fate of Tebuthiuron and Hexazinone in Green-Cane Harvesting System

Fate of Tebuthiuron and Hexazinone in Green-Cane Harvesting System

Evaluation of a System to Assess Herbicide Movement in Straw under Dry and Wet Conditions

Selection of microorganisms and preparation of inoculants with potential applications in the remediation of soil contaminated with hexazinone

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