Clomazone and Starter Nitrogen Fertilizer Effects on Growth and Yield of Hybrid and Inbred Rice Cultivars

Golden, Bobby R.; Lawrence, Benjamin H.; Bond, Jason A.; Edwards, H. Matthew; Walker, T. W.

doi:10.1017/wet.2016.33

Cited by 6 publications

(4 citation statements)

References 28 publications

(45 reference statements)

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“…Differences among cultivars and herbicide tolerance has been reported previously (Davis et al 2011;Golden et al 2017;Lanclos et al 1999;Mudge et al 2005). Previous research suggests that hybrid cultivars may incur greater yield reductions than inbred cultivars with glyphosate exposure (Davis et al 2011).…”

Section: Rough Rice Grain Yieldmentioning

confidence: 69%

Rice cultivar response to sublethal concentrations of glyphosate and paraquat late in the season

et al. 2020

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Differential tolerance may be observed among rice cultivars with desiccant exposure events during rice reproduction and ripening. Five field studies were established at the Mississippi State University Delta Research and Extension Center in Stoneville, MS, to determine the effects of exposure to sub-lethal concentrations of common desiccants across multiple rice cultivars. Rice cultivars in the study were ‘CLXL745’, ‘XL753’, ‘CL163’, ‘Rex’, and ‘Jupiter’. Desiccant treatments included no desiccant, paraquat, or glyphosate and were applied at the 50% heading growth stage respective to cultivar. Differential injury estimates among cultivars and desiccant treatments was observed when glyphosate or paraquat was applied at 50% heading. Injury from glyphosate at 50% heading was non-detectable across all cultivars. However, injury following paraquat applications was >7% across all rating intervals and cultivars. Hybrid cultivars exhibited less injury with paraquat applications than the inbred cultivars in the study. Rice following exposure to glyphosate or paraquat at 50% heading growth stage produced rough rice grain yield decreases ranging from 0 to 20 and 9 to 21 %, respectively. Rough rice grain yield decreases were observed across all cultivars following paraquat exposure, and all inbred cultivars following glyphosate exposure. Across desiccant treatment, head rice yield was reduced in three of five cultivars in the study. When pooled across cultivar, paraquat applications cause a head rice yield reduction of 10%, while rice following glyphosate application remained >95%. While differential tolerance among cultivars to paraquat or glyphosate exposure was observed, impacts on grain quality coupled with yield reductions suggests extreme rice sensitivity to exposure to sub-lethal concentrations of these desiccants at the 50% heading growth stage.

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Section: Rough Rice Grain Yieldmentioning

confidence: 69%

Rice cultivar response to sublethal concentrations of glyphosate and paraquat late in the season

et al. 2020

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“…We suggest that continued management with cover fertilizers can help the plants to recover. Camargo et al (2011) observed recovery of rice plants with high levels of injury by the application of post-emergence herbicides, suggesting that the management of the crop and the addition of nutrients by nitrogenous fertilizers (Golden et al, 2017), as well as the entry of water (Avila et al, 2009), contribute to plant recovery. The estimated drift rates using the phytotoxicity level of the sentinel plants were 14, 13, and 5% of the package insert dose (1,920 g e.a.…”

Section: Resultsmentioning

confidence: 99%

Drift Distance in Aircraft Glyphosate Application Using Rice Plants as Indicators

et al. 2020

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ABSTRACT: This study aimed to evaluate the potential for glyphosate drift during aerial application using rice plants as sentinels, aiming to determine the effect of drift on irrigated rice crops. For this purpose, a field experiment was performed using an entirely randomized design with four replicates, evaluating different distances from the site of application [control (no application), 0, 12.5, 25, 50, 75, 100, 150, 200, 300, and 400 m]. The experiment was carried out at the Granjas 4 Irmãos farm, located in the Rio Grande city, Rio Grande do Sul State, Brazil. The glyphosate dose application was 1,920 g e.a. ha-1 (Roundup Transorb®, 480 g e.a. L-1 glyphosate isopropylamine salt). A dose-response curve was developed to estimate the drift rate in sentinel plants, by applying increasing glyphosate doses in rice plants and assessing the injury level. The drift rates estimated by the injury level in sentinel plants were 14% (150 m), 13% (200 m), and 5% (400 m). Death of the experimental units was observed for distances between 0 and 50 m, while in distances between 75 and 150 m, 25 to 50% of the plants survived, reducing productivity. In the distances between 200 and 400 m, there was no reduction in productivity when compared to the control, even when the injury levels reached 52 to 82%. Thus, we concluded that a 5% glyphosate drift reached up to 400 m from the application range. Considering the recommendation of zero drift, distances greater than 400 m should be adopted to avoid symptoms in rice plants. We suggest using distances of more than 400 m in future studies.

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“…Based on these data, only clomazone should be utilized as a fall-applied residual herbicide treatment targeting GR Italian ryegrass prior to seeding rice. Of note, differential susceptibility to clomazone among rice cultivars has been documented (Golden et al 2017; Scherder et al 2004; Zhang et al 2004), and the current research included only one inbred rice cultivar, ‘CL151’. Previous research on cultivar response to clomazone included applications at or near the time of rice seeding.…”

Section: Resultsmentioning

confidence: 99%

Effect of Fall-Applied Residual Herbicides on Rice Growth and Yield

et al. 2018

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Glyphosate-resistant (GR) Italian ryegrass is one of the most troublesome weeds in Mississippi row crop production. Fall-applied residual herbicide applications are recommended for control of GR Italian ryegrass. However, carryover of residual herbicides applied in fields for rice production can have a negative impact on rice performance. Field studies were conducted in Stoneville, MS, to determine the effects of fall-applied residual herbicides on rice growth and yield. Herbicide treatments included suggested use rates (1×) of clomazone at 840 g ai ha–1, pyroxasulfone 170 g ai ha–1,S-metolachlor 1,420 g ai ha–1, and trifluralin 1,680 g ai ha–1, and two times (2×) the suggested use rates in the fall before rice seeding. Pooled across application rate, pyroxasulfone,S-metolachlor, and trifluralin injured rice to an extent 28% to 36% greater than clomazone 14 d after emergence (DAE). Rice seedling density and height 14 DAE and rice maturity were negatively affected by all fall-applied herbicides except clomazone. Applications at 2× rates reduced rough rice yields in plots treated with pyroxasulfone,S-metolachlor, and trifluralin compared with clomazone. Pyroxasulfone applied at the 2× rate reduced rough rice yield 22% compared with the 1× rate. Rough rice yield was 90% or greater of the nontreated control in plots treated with either rate ofS-metolachlor, and these were comparable with rough rice yields from plots treated with both rates of trifluralin and the 1× rate of pyroxasulfone. Early-season injury and reductions in seedling density and height 14 DAE, would preclude even 1× applications of pyroxasulfone,S-metolachlor, and trifluralin from being viable options for residual herbicide treatments targeting GR Italian ryegrass in the fall before rice seeding. Of the herbicides evaluated, only clomazone should be utilized as a fall-applied residual herbicide treatment targeting GR Italian ryegrass before seeding rice.

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Clomazone and Starter Nitrogen Fertilizer Effects on Growth and Yield of Hybrid and Inbred Rice Cultivars

Cited by 6 publications

References 28 publications

Rice cultivar response to sublethal concentrations of glyphosate and paraquat late in the season

Rice cultivar response to sublethal concentrations of glyphosate and paraquat late in the season

Drift Distance in Aircraft Glyphosate Application Using Rice Plants as Indicators

Effect of Fall-Applied Residual Herbicides on Rice Growth and Yield

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