Profundidade de localização do herbicida imazetapir + imazapique no solo sobre a fitotoxicidade em de plantas de arroz não resistente

Bundt, Angela Da Cas; Avila, Luis Antônio de; Agostinetto, Dirceu; Nohatto, Marcos André; Souto, Kelen Müller; Senseman, Scott A.

doi:10.1590/s0103-84782010000900003

Cited by 2 publications

(1 citation statement)

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“…This behavior can be explained by the herbicide leaching in the lysimeter, reaching greater depths in those treatments with thicker profile; however in the shallower ones, the impervious layer physical barrier has limited the herbicide leaching, promoting a higher herbicide accumulation near the soil surface. When the herbicide leaches to greater depths, there is a relative positioning selectivity (Bundt et al, 2010). When the herbicide is deeper in soil profile, seedlings roots absorbs less herbicide, once it is not located in the higher absorption zone of most plants root.…”

Section: Resultsmentioning

confidence: 99%

Carryover of Imazethapyr + Imazapic on Ryegrass and Non-tolerant Rice as Affected by Thickness of Soil Profile

et al. 2015

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-Herbicides used in Clearfield ® rice system may persist in the environment, damaging non-tolerant crops sown in succession and/or rotation. These damages vary according to soil characteristics, climate and soil management. The thickness of the soil profile may affect carryover effect; deeper soils may allow these molecules to leach, reaching areas below the roots absorption zone. The aim of this study was to evaluate the effect of the thickness of soil profile in the carryover of imazethapyr + imazapic on ryegrass and nontolerant rice, sown in succession and rotation to rice, respectively. Lysimeters of different thicknesses (15, 20, 30, 40, 50 and 65 cm) were constructed, where 1 L ha -1 of the imazethapyr + imazapic formulated mixture was applied in tolerant rice. Firstly, imidazolinone-tolerant rice was planted, followed by ryegrass and non-tolerant rice in succession and rotation, respectively. Herbicide injury, height reduction and dry weight of non-tolerant species were assessed. There was no visual symptoms of herbicide injury on ryegrass sown 128 days after the herbicide application; however it causes dry weight mass reduction of plants. The herbicides persist in the soil and cause injury in non-tolerant rice, sown 280 days after application, and the deeper the soil profile, the lower the herbicides injury on irrigated rice.Keywords: degradation, imidazolinone, Lolium multiflorum, leaching, Oryza sativa. (15, 20, 30, 40, 50 RESUMO -Os herbicidas usados na cultura do arroz

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Section: Resultsmentioning

confidence: 99%