scholarly journals Downy Brome (Bromus tectorum) Control with Imazapic on Montana Grasslands

2013 ◽  
Vol 6 (4) ◽  
pp. 554-558 ◽  
Author(s):  
Jane Mangold ◽  
Hilary Parkinson ◽  
Celestine Duncan ◽  
Peter Rice ◽  
Ed Davis ◽  
...  
Keyword(s):  
Growth Stage ◽  
Mixed Model ◽  
Leaf Growth ◽  
Application Rate ◽  
Downy Brome ◽  
Application Timing ◽  
Research Triangle ◽  
Mixed Model Anova ◽  
Management Recommendations ◽  
Main Effects

AbstractDowny brome is a problematic invasive annual grass throughout western rangeland and has been increasing its abundance, spread, and impacts across Montana during the past several years. In an effort to develop effective management recommendations for control of downy brome on Montana rangeland, we compiled data from 24 trials across the state that investigated efficacy of imazapic (Plateau®, BASF Corporation, Research Triangle Park, NC) applied at various rates and timings and with methylated seed oil (MSO) or a nonionic surfactant (NIS). We ran a mixed-model ANOVA to test for main effects and interactions across application rate (70, 105, 141, 176, and 211 g ai ha−1), application timing (preemergent [PRE], early postemergent [EPOST, one- to two-leaf growth stage], and postemergent [POST, three- to four-leaf growth stage]), and adjuvant (MSO, NIS). Application timing and rate interacted to affect downy brome control (P = 0.0033). PRE imazapic application resulted in the lowest downy brome control (5 to 19%), followed by POST application (25 to 77%) and EPOST application (70 to 95%). Downy brome control remained fairly consistent across rates within application timing. Adjuvant (MSO or NIS) did not affect downy brome control (P = 0.2789). Our data indicate that POST application at 105 to 141 g ai ha−1 provides the most-consistent, short-term control of downy brome. Furthermore, applying imazapic to downy brome seedlings shortly after emergence (one- to two-leaf growth stage) provided better control than applying it to older downy brome seedlings (three- to four-leaf growth stage).

Control of Early Watergrass (Echinochloa Oryzoides) and Late Watergrass (Echinochloa Phyllopogon) with Cyhalofop, Clefoxydim, and Penoxsulam Applied Alone and in Mixture with Broadleaf Herbicides

2006 ◽  
Vol 20 (4) ◽  
pp. 992-998 ◽  
Author(s):  
Christos A. Damalas ◽  
Kico V. Dhima ◽  
Ilias G. Eleftherohorinos
Keyword(s):  
Growth Stage ◽  
Leaf Growth ◽  
Application Rate ◽  
Early Growth ◽  
Rice Fields ◽  
Growth Stages ◽  
Early Growth Stage ◽  
Late Growth ◽  
Echinochloa Phyllopogon

Experiments were conducted to study the effect of application rate, growth stage, and tank-mixing azimsulfuron or bentazon on the activity of cyhalofop, clefoxydim, and penoxsulam against two morphologically distinctEchinochloaspecies from rice fields in Greece. Mixtures of penoxsulam with MCPA were also evaluated. Cyhalofop (300 to 600 g ai/ha) applied at the three- to four-leaf growth stage provided 62 to 85% control of early watergrass but 41 to 83% control of late watergrass averaged over mixture treatments. Control ranged from 37 to 80% for early watergrass and from 35 to 78% for late watergrass when cyhalofop was applied at the five- to six-leaf growth stage averaged over mixture treatments. Mixtures of cyhalofop with azimsulfuron or bentazon reduced efficacy on both species irrespective of growth stage or cyhalofop application rate compared with cyhalofop alone. Clefoxydim (100 to 250 g ai/ha) applied alone at the three- to four-leaf growth stage provided 98 to 100% control of early watergrass and 91 to 100% control of late watergrass; when clefoxydim was applied alone at the five- to six-leaf growth stage the control obtained was 91 to 100% for early watergrass and 79 to 100% for late watergrass. Mixtures of clefoxydim with azimsulfuron or bentazon reduced efficacy on late watergrass at the early growth stage and on both species at the late growth stage. Penoxsulam (20 to 40 g ai/ha) applied alone provided 94 to 100% control of both species at both growth stages. Mixtures of MCPA with penoxsulam reduced efficacy on late watergrass at the early growth stage and on both species at the late growth stage. Mixtures of penoxsulam with azimsulfuron or bentazon reduced efficacy only on late watergrass at the late growth stage.

Use of AC 263,222 for Sicklepod (Cassia obtusifolia) Control in Soybean (Glycine max)

1991 ◽  
Vol 5 (2) ◽  
pp. 434-438 ◽  
Author(s):  
Marshall B. Wixson ◽  
David R. Shaw
Keyword(s):  
Glycine Max ◽  
Growth Stage ◽  
Field Experiments ◽  
Application Rate ◽  
Cassia Obtusifolia ◽  
Soybean Yield ◽  
Application Timing ◽  
Height Reduction ◽  
Ac 263,222

Field experiments were established in 1989 and 1990 to determine the effects of application rate and timing on sicklepod control and soybean tolerance to POST applications of AC 263,222 and chlorimuron. When applied to 3-, 6-, or 10-leaf sicklepod, 35 g ai ha-1or more AC 263,222 controlled more than 85% of sicklepod early in the season, and season-long when applied to 3- or 6-leaf sicklepod. At all timings, 70 g ha-1or more AC 263,222 resulted in better control than a PRE application of 420 g ai ha-1metribuzin followed by 9 g ai ha-1chlorimuron applied POST. At 35 g ha-1or more AC 263,222, application timing did not affect sicklepod control. However, control was reduced with 18 g ha-1when applications were delayed from 3- or 6-leaf to 10-leaf sicklepod. At the 10-leaf sicklepod growth stage, a PRE application of imazaquin increased both sicklepod control and soybean yield with 35 g ha-1AC 263,222 as compared with AC 263,222 applied alone. Soybean injury and height reductions with AC 263,222 at 35 g ha-1and above were greater than with chlorimuron; however, increased soybean injury or height reduction was not reflected in pod numbers or yield.

Motivation and Preference for Acoustic or Tablet-Based Musical Instruments: Comparing Guitars and Gayageums

2018 ◽  
Vol 66 (3) ◽  
pp. 278-294
Author(s):  
Sangmi Kang
Keyword(s):  
Mixed Model ◽  
General Pattern ◽  
Musical Instrument ◽  
String Instrument ◽  
Mixed Model Anova ◽  
Acoustic Instruments ◽  
Preference Ratings ◽  
Level Of Motivation ◽  
Main Effects ◽  
Low Motivation

The purpose of this study was to examine the effect of motivation on upper-grade elementary students’ preferences for acoustic or tablet-based instruments. The effect of cultural familiarity on musical instrument preference was also investigated. Participants ( N = 138) were classified by motivation levels (low, medium-low, medium-high, and high) and played the guitar, tablet-based guitar, gayageum (Korean string instrument), and tablet-based gayageum. After playing each instrument, participants rated preferences and provided their reasons. Results of the mixed-model ANOVA revealed two significant main effects for instrumental mode (acoustic vs. tablet-based) and motivation on instrument preference. A significant three-way interaction was also found: Cultural Familiarity × Mode × Motivation. The two main effects of mode and motivation produced a general pattern in instrument preference: (a) Students generally preferred acoustic instruments to tablet-based instruments, and (b) the level of motivation was associated with the degree of preference ratings. However, the interaction effect deviated from the general pattern; the low motivation group participants’ preference ratings between acoustic and tablet-based guitars were not significantly different. This deviation from the general pattern appeared only for the culturally familiar instrument (guitar) but not the culturally unfamiliar instrument (gayageum) among the low motivation group.

Effect of hybrid varieties, application timing, and herbicide rate on field corn tolerance to tolpyralate plus atrazine

Weed Science ◽  
2019 ◽  
Vol 67 (05) ◽  
pp. 475-484 ◽  
Author(s):  
Brendan A. Metzger ◽  
Nader Soltani ◽  
Alan J. Raeder ◽  
David C. Hooker ◽  
Darren E. Robinson ◽  
...  
Keyword(s):  
Mixed Model ◽  
Field Experiments ◽  
Application Rate ◽  
Time Of Day ◽  
Corn Hybrids ◽  
Visible Injury ◽  
Application Timing ◽  
Field Corn ◽  
Crop Injury ◽  
Grain Moisture

AbstractA wide margin of crop safety is a desirable trait of POST herbicides, and investigation of crop tolerance is a key step in evaluation of new herbicides. Six field experiments were conducted in Ontario, Canada, from 2017 to 2018 to examine the influence of corn (Zea mays L.) hybrid (DKC42-60RIB, DKC43-47RIB, P0094AM, and P9840AM), application rate (1X and 2X), and application timing (PRE, V1, V3, and V5) on the tolerance of field corn to tolpyralate, a new 4-hydroxyphenyl pyruvate dioxygenase inhibitor, co-applied with atrazine. Two corn hybrids (DKC42-60RIB and DKC43-47RIB) exhibited slightly greater visible injury from tolpyralate + atrazine, applied POST, than P0094AM and P9840AM at 1 to 2 wk after application (WAA); hybrids responded similarly with respect to height, grain moisture, and yield. Applications of tolpyralate + atrazine at a 2X rate (80 + 2,000 g ai ha−1) induced greater injury (≤31.6%) than the field rate (40 + 1,000 g ha−1) (≤11.6%); the 2X rate applied at V1 or V3 decreased corn height and slightly increased grain moisture at harvest. On average, field rates resulted in marginally higher grain yields than 2X rates. Based on mixed-model multiple stepwise regression analysis, the air temperature at application, time of day, temperature range in the 24 h before application, and precipitation following application were useful predictor variables in estimating crop injury with tolpyralate + atrazine; however, additional environmental variables also affected crop injury. These results demonstrate the margin of corn tolerance with tolpyralate + atrazine, which provides a basis for optimization of application timing, rate, and corn hybrid selection to mitigate the risk of crop injury with this herbicide tank mixture.

Validity of the SenseWear Armband to Assess Energy Expenditure in Graded Walking

2015 ◽  
Vol 12 (2) ◽  
pp. 178-183 ◽  
Author(s):  
Gianluca Vernillo ◽  
Aldo Savoldelli ◽  
Barbara Pellegrini ◽  
Federico Schena
Keyword(s):  
Physical Activity ◽  
Energy Expenditure ◽  
Indirect Calorimetry ◽  
Mixed Model ◽  
Sensewear Armband ◽  
Mixed Model Anova ◽  
Significant Difference ◽  
Advance Research ◽  
Downhill Walking ◽  
Main Effects

Background:Accurate assessments of physical activity and energy expenditure (EE) are needed to advance research on positive and negative graded walking.Purpose:To evaluate the validity of 2 SenseWear Armband monitors (Pro3 and the recently released Mini) during graded walking.Methods:Twenty healthy adults wore both monitors during randomized walking activities on a motorized treadmill at 7 grades (0%, ±5%, ±15%, and ±25%). Estimates of total EE from the monitors were computed using different algorithms and compared with values derived from indirect calorimetry methodology using a 2-way mixed model ANOVA (Device × Condition), correlation analyses and Bland-Altman plots.Results:There was no significant difference in EE between the 2 armbands in any of the conditions examined. Significant main effects for device and condition, as well as a consistent bias, were observed during positive and negative graded walking with a greater over- and under-estimation at higher slope.Conclusions:Both the armbands produced similar EE values and seem to be not accurate in estimation of EE during activities involving uphill and downhill walking. Additional work is needed to understand factors contributing to this discrepancy and to improve the ability of these monitors to accurately measure EE during graded walking.

scholarly journals Sumagic (Uniconazole) Promotes Flower Bud Set on Camellia japonica

2005 ◽  
Vol 23 (3) ◽  
pp. 153-157
Author(s):  
Thomas J. Banko ◽  
Amelia L. Landon
Keyword(s):  
Growth Stage ◽  
Shoot Growth ◽  
Application Rate ◽  
Growth Stages ◽  
Water Control ◽  
Flower Bud ◽  
Camellia Japonica ◽  
Application Timing ◽  
Bud Set

Abstract Three-year-old container-grown plants of Camellia japonica ‘Grace Albritton’, ‘Paulette Goddard’, and ‘Sea Foam’ were sprayed with a water control, B-Nine (daminozide) at 5000 ppm, Bonzi (paclobutrazol) at 80, 120, 160, 200, and 240 ppm, or Sumagic (uniconazole) at 30, 45, 60, 75, and 90 ppm in June. B-Nine and Bonzi treatments provided no increase in flower bud set but Sumagic treatments increased bud set for ‘Grace Albritten’ by up to 370% and ‘Paulette Goddard’ by 200%. In another experiment, Sumagic at 0, 45, 60, 75, and 90 ppm was applied to ‘Grace Albritton’, ‘Paulette Goddard’, and ‘Blood of China’ at three different spring growth stages: Bud swell, partial new shoot growth, and new shoots fully extended. Significant linear or quadratic increases in flower bud set occurred for all cultivars depending on application timing. Application at the two earlier stages resulted in more flowers than application at the latest (full shoot growth) stage. Sumagic decreased plant heights by 10 to 30%, depending on cultivar and application rate but this reduced the need for shearing to maintain form and compactness and made flowers more visible over the surface of the plants.

Investigating Strength and Range of Motion of the Hip Complex in Ice Hockey Athletes

2015 ◽  
Vol 24 (3) ◽  
pp. 300-306 ◽  
Author(s):  
Christopher R.J. Wilcox ◽  
Chad T. Osgood ◽  
Hollie S.F. White ◽  
Rebecca V. Vince
Keyword(s):  
Range Of Motion ◽  
Outcome Measures ◽  
Mixed Model ◽  
External Rotation ◽  
Ice Hockey ◽  
Division Iii ◽  
Mixed Model Anova ◽  
Limb Injuries ◽  
Hip Flexion ◽  
Main Effects

Context:Ice hockey athletes frequently injure the hip complex via a noncontact mechanism. The authors investigated patterns of strength and range of motion (ROM) to establish major differences compared with soccer athletes. Soccer athletes were compared with ice hockey athletes due to similarities between the 2 sports with regard to the intermittent nature and high number of lower-limb injuries.Objective:To compare the differences in ROM and strength of the hip for both the dominant (Dom) and nondominant (Ndom) limbs in ice hockey and soccer athletes.Design:Case-control study.Setting:Bilateral ROM in hip flexion in sitting (FS) and lying (FL), extension, abduction, adduction, and internal rotation (IR) and external rotation (ER) were measured using a goniometer and assessed for strength using a handheld dynamometer on both the Dom and Ndom limbs.Participants:24 male, active, uninjured NCAA Division III ice hockey (16) and soccer (8) athletes.Main Outcome Measures:ROM and strength for hip FS, FL, extension, abduction, adduction, IR, and ER. A mixed-model ANOVA was used to investigate interactions and main effects.Results:Ice hockey athletes exhibited greater hip-adduction ROM than soccer athletes in the Dom leg (both P = .002) and when both limbs were combined (P = .010). Ice hockey athletes had less ROM in ER (P = .042) than soccer athletes. Ice hockey athletes displayed less strength in adduction in their Ndom leg than in their Dom leg (P = .02), along with less adduction than soccer players in their Ndom leg (P = .40). Ice hockey athletes displayed less strength in hip adduction (P = .030), FS (P = .023) and FL (P = .030) than soccer athletes.Conclusions:The findings suggest that ice hockey athletes may present an at-risk profile for noncontact hip injuries in comparison with soccer athletes with regard to strength and ROM of the hip.

Evaluation of the SenseWear Mini Armband to Assess Energy Expenditure During Pole Walking

2014 ◽  
Vol 24 (5) ◽  
pp. 565-569 ◽  
Author(s):  
Gianluca Vernillo ◽  
Aldo Savoldelli ◽  
Barbara Pellegrini ◽  
Federico Schena
Keyword(s):  
Energy Expenditure ◽  
Indirect Calorimetry ◽  
Significant Interaction ◽  
Mixed Model ◽  
Total Energy Expenditure ◽  
Motion Sensor ◽  
Sensewear Armband ◽  
Mixed Model Anova ◽  
Main Effects ◽  
Pole Walking

The current study aimed to show the validity of a portable motion sensor, the SenseWear Armband (SWA), for the estimation of energy expenditure during pole walking. Twenty healthy adults (mean ± SD: age 30.1 ± 7.2 year, body mass 66.1 ± 10.6 kg, height 172.4 ± 8.0 cm, BMI 22.1 ± 2.4 kg·m−2) wore the armband during randomized pole walking activities at a constant speed (1.25 m·s−1) and at seven grades (0%, ±5%, ±15% and ±25%). Estimates of total energy expenditure from the armband were compared with values derived from indirect calorimetry methodology (IC) using a 2–way mixed model ANOVA (Device × Slope), correlation analyses and Bland-Altman plots. Results revealed significant main effects for device, and slope (p < .025) as well as a significant interaction (p < .001). Significant differences between IC and SWA were observed for all conditions (p < .05). SWA generally underestimate the EE values during uphill PW by 0.04 kcal·kg−1·min−1 (p < .05). Whereas, a significant overestimation has been detected during flat and downhill PW by 0.01 and 0.03 kcal·kg−1·min−1 (p < .05), respectively. The Bland-Altman plots revealed bias of the armband compared with the indirect calorimetry at any condition examined. The present data suggest that the armband is not accurate to correctly detect and estimate the energy expenditure during pole walking activities. Therefore, the observed over- and under-estimations warrants more work to improve the ability of SWA to accurately measure EE for these activities.

Bispyribac–Sodium Efficacy on Early Watergrass (Echinochloa oryzoides) and Late Watergrass (Echinochloa Phyllopogon) as Affected by Coapplication of Selected Rice Herbicides and Insecticides

2008 ◽  
Vol 22 (4) ◽  
pp. 622-627 ◽  
Author(s):  
Christos A. Damalas ◽  
Kico V. Dhima ◽  
Ilias G. Eleftherohorinos
Keyword(s):  
Growth Stage ◽  
Leaf Growth ◽  
Application Rate ◽  
Rice Fields ◽  
Single Application ◽  
Northern Greece ◽  
Echinochloa Phyllopogon

Experiments were conducted to evaluate the effect of application rate, growth stage, and tank mixing azimsulfuron, bentazon, MCPA, propanil, or cyhalofop on the efficacy of bispyribac–sodium against early watergrass and late watergrass from rice fields in northern Greece. Mixtures of bispyribac–sodium with the insecticides carbaryl, diazinon, and dichlorvos were also evaluated. Bispyribac–sodium (24 to 36 g ai/ha) applied alone at the three- to four-leaf growth stage provided 89 to 100% control of early watergrass and 84 to 100% control of late watergrass. When bispyribac–sodium was applied alone at the five- to six-leaf growth stage of early watergrass and late watergrass, control ranged from 78 to 100% and 71 to 100%, respectively. Mixtures of bispyribac–sodium with azimsulfuron provided better control of both species at any growth stage than bispyribac–sodium applied alone. On the contrary, mixtures of bispyribac–sodium with bentazon, MCPA, or propanil were less effective on both species at any growth stage than bispyribac–sodium applied alone. A slight efficacy reduction occurred on both species for the mixture of bispyribac–sodium with cyhalofop. Mixtures of bispyribac–sodium with the insecticides carbaryl or dichlorvos showed reduced efficacy on both species, whereas increased efficacy on both species was observed for mixtures of bispyribac–sodium with diazinon as compared with the single application of bispyribac–sodium.

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