Effect of Simulated Aminocyclopyrachlor Drift on Flue-Cured Tobacco

2011 ◽  
Vol 25 (4) ◽  
pp. 609-615 ◽  
Author(s):  
D. F. Lewis ◽  
S. T. Hoyle ◽  
L. R. Fisher ◽  
F. H. Yelverton ◽  
R. J. Richardson
Keyword(s):  
Tobacco Plant ◽  
Application Rate ◽  
Research Station ◽  
Volatility Risk ◽  
Synthetic Auxin ◽  
Right Of Way ◽  
Brush Control ◽  
Herbicide Drift ◽  
Reduced Risk

Flue-cured tobacco is sensitive to foliar and soil residues of off-target synthetic auxin drift. Aminocyclopyrachlor is a newly developed synthetic auxin herbicide that may be used in right-of-way applications for broadleaf weed and brush control. Aminocyclopyrachlor is considered a reduced-risk alternative in rights-of-way compared with similar compounds because of its low application rate and volatility risk. However, no research is available on the response of field-grown, flue-cured tobacco to aminocyclopyrachlor drift exposure. Research was conducted in 2009 and 2010 at the Border Belt Tobacco Research Station in Whiteville, NC, to determine the response of ‘NC 71’ flue-cured tobacco to five simulated drift rates of aminocyclopyrachlor (0.31, 1.6, 3.1, 15.7, and 31.4 g ae ha−1) and one aminopyralid (6.1 g ae ha−1) simulated drift rates applied pretransplant incorporated, pretransplant unincorporated, 3 wk after transplant, and 6 wk after transplant. All herbicide rates and application timings caused significant visual tobacco injury, ranging from slight to severe with increasing herbicide drift rates. Tobacco plant heights and fresh weights were reduced at all application timings receiving ≥ 15.7 g ha−1aminocyclopyrachlor and the comparative aminopyralid rate.

scholarly journals Effect of Organic and Inorganic Sources of Fertilizers on Growth, Yield and Quality of Bidi Tobacco (Nicotiana tabacum L.) Variety GABT 11

2020 ◽  
pp. 1-6
Author(s):  
K. M. Gediya ◽  
Jalpa P. Panchal ◽  
D. H. Desai ◽  
G. M. Padhiyar
Keyword(s):  
Ammonium Sulphate ◽  
Tobacco Plant ◽  
Growth Yield ◽  
Cost Ratio ◽  
Research Station ◽  
Net Income ◽  
Green Manuring ◽  
Yield And Quality ◽  
Bidi Tobacco

A field experiment was conducted at Bidi Tobacco Research Station, Anand Agricultural University, Anand for four years from 2014-15 to 2017-18 with the objective to study the effect of organic and inorganic sources of fertilizers on growth, yield and quality of bidi tobacco variety GABT 11. Results revealed that different manures and fertilizers failed to exert their significant effect on yield of bidi tobacco variety GABT 11 during all four years and in its pooled. Green manuring every year with sunnhemp recorded significantly maximum leaf size viz. leaf length and width followed by application of FYM @ 12.5 t/ha every year. Besides, Application of 180 kg N/ha through ammonium sulphate gave significantly higher tobacco plant height over application of 180 kg N/ha through castor cake and application of 135 kg N/ha through ammonium sulphate + 90 kg P2O5/ha through single super phosphate + 135 kg K2O/ha through sulphate of potash. Maximum monetary returns with benefit: cost ratio of 2.68 accrued with treatment of 180 kg N/ha through Ammonium sulphate. Among different bulky manures, green manuring with sunnhemp every year gave maximum gross income and net income with BCR value 2.43.

Rate and Application Timing Effects on Tolerance of Covington Sweetpotato to S-Metolachlor

2013 ◽  
Vol 27 (4) ◽  
pp. 729-734 ◽  
Author(s):  
Stephen L. Meyers ◽  
Katherine M. Jennings ◽  
David W. Monks ◽  
Donnie K. Miller ◽  
Mark W. Shankle
Keyword(s):  
Linear Response ◽  
Field Studies ◽  
Application Rate ◽  
Width Ratio ◽  
Research Station ◽  
Storage Roots ◽  
Marketable Yield ◽  
Application Timing ◽  
Horticultural Crops ◽  
Quadratic Response

Field studies were conducted in 2011 and 2012 at the Horticultural Crops Research Station near Clinton, NC, to determine ‘Covington' sweetpotato tolerance to S-metolachlor rate and application timing. Treatments were a factorial arrangement of four S-metolachlor rates (0, 1.1, 2.2, or 3.4 kg ai ha−1) and six application timings (0, 2, 5, 7, 9, or 14 d after transplanting [DAP]). Immediately following application, 1.9 cm of irrigation was applied to individual plots. Sweetpotato injury was minimal for all treatments (≤ 10%). No. 1 grade sweetpotato yield displayed a negative linear response to S-metolachlor rate, and decreased from 25,110 to 20,100 kg ha−1 as S-metolachlor rate increased from 0 to 3.4 kg ha−1. Conversely, no. 1 sweetpotato yield displayed a positive linear response to S-metolachlor application timing and increased from 19,670 to 27,090 kg ha−1 as timing progressed from 0 to 14 DAP. Total marketable sweetpotato yield displayed a quadratic response to both S-metolachlor application rate and timing. Total marketable yield decreased from 44,950 to 30,690 kg ha−1 as S-metolachlor rate increased from 0 to 3.4 kg ha−1. Total marketable yield increased from 37,800 to 45,780 kg ha−1 as application timing was delayed from 0 to 14 DAP. At 1.1 kg ha−1S-metolachlor, sweetpotato storage root length to width ratio displayed a quadratic relationship to application timing and increased from 1.87 to 2.23 for applications made 0 to 14 DAP. At 2.2 kg ha−1 of S-metolachlor, sweetpotato length to width ratio displayed a quadratic response to application timing, increased from 1.57 to 2.09 for 0 to 10 DAP, and decreased slightly from 2.09 to 2.03 for 10 to 14 DAP. Application timing did not influence length to width ratio of sweetpotato storage roots for those plots treated with S-metolachlor at either 0 or 3.4 kg ha−1.

A Meta-Analysis on the Effects of 2,4-D and Dicamba Drift on Soybean and Cotton

Weed Science ◽  
2014 ◽  
Vol 62 (1) ◽  
pp. 193-206 ◽  
Author(s):  
J. Franklin Egan ◽  
Kathryn M. Barlow ◽  
David A. Mortensen
Keyword(s):  
Crop Yield ◽  
Dose Response ◽  
Yield Loss ◽  
Meta Analysis ◽  
Growth Stages ◽  
Response Curves ◽  
Synthetic Auxin ◽  
Final Yield ◽  
Dose Response Curves ◽  
Herbicide Drift

Commercial introduction of cultivars of soybean and cotton genetically modified with resistance to the synthetic auxin herbicides dicamba and 2,4-D will allow these compounds to be used with greater flexibility but may expose susceptible soybean and cotton cultivars to nontarget herbicide drift. From past experience, it is well known that soybean and cotton are both highly sensitive to low-dose exposures of dicamba and 2,4-D. In this study, a meta-analysis approach was used to synthesize data from over seven decades of simulated drift experiments in which investigators treated soybean and cotton with low doses of dicamba and 2,4-D and measured the resulting yields. These data were used to produce global dose–response curves for each crop and herbicide, with crop yield plotted against herbicide dose. The meta-analysis showed that soybean is more susceptible to dicamba in the flowering stage and relatively tolerant to 2,4-D at all growth stages. Conversely, cotton is tolerant to dicamba but extremely sensitive to 2,4-D, especially in the vegetative and preflowering squaring stages. Both crops are highly variable in their responses to synthetic auxin herbicide exposure, with soil moisture and air temperature at the time of exposure identified as key factors. Visual injury symptoms, especially during vegetative stages, are not predictive of final yield loss. Global dose–response curves generated by this meta-analysis can inform guidelines for herbicide applications and provide producers and agricultural professionals with a benchmark of the mean and range of crop yield loss that can be expected from drift or other nontarget exposures to 2,4-D or dicamba.

Field Measurements of Drift of Conventional and Drift Control Formulations of 2,4-D Plus Glyphosate

2018 ◽  
Vol 32 (5) ◽  
pp. 550-556 ◽  
Author(s):  
Patrick L. Havens ◽  
David E. Hillger ◽  
Andrew J. Hewitt ◽  
Greg R. Kruger ◽  
Lia Marchi-Werle ◽  
...  
Keyword(s):  
Weed Control ◽  
Weed Management ◽  
Potassium Salt ◽  
Field Measurements ◽  
Field Scale ◽  
Typical Application ◽  
Synthetic Auxin ◽  
Increased Risk ◽  
Extended Range ◽  
Herbicide Drift

AbstractRecent advances in biotechnology have resulted in crops that are tolerant to the synthetic auxin 2,4-D, expanding the weed management versatility of this herbicide. With potential expansions of use, concerns have been raised about the increased risk of herbicide drift, leading to damage to nontarget crops. A field-scale study was conducted with the objective to measure drift deposition and the potential for drift reduction conferred by a proprietary pre-mixture formulation of 2,4-D choline salt plus glyphosate dimethylammonium salt compared to an in-tank mixture of 2,4-D dimethylamine salt plus glyphosate potassium salt. Treatments were made with field-scale spray equipment under typical application conditions in McCook, NE, using three widely used nozzle tips. Deposition was captured in triplicate downwind collector lines and assayed for tracer dye and 2,4-D. In comparison to the in-tank mixture, the pre-mixture formulation exhibited lower downwind depositions when applied through a flat-fan (TeeJet Extended Range; XR) and air induction (TeeJet Air Induction Extended Range; AIXR) nozzles, but not with a pre-orifice (TeeJet TurboTeeJet Induction; TTI) nozzle. Based upon median deposition at 30 m downwind, the pre-mixture formulation reduced drift by 62% and 91%, for the XR and AIXR nozzles, respectively. From a drift reduction perspective, the pre-mixture formulation performance with the AIXR nozzle was equivalent to a much coarser TTI nozzle while still offering sufficient foliar coverage for acceptable weed control.

Response of Sweetpotato to Oryzalin Application Rate and Timing

2018 ◽  
Vol 32 (6) ◽  
pp. 722-725 ◽  
Author(s):  
Sushila Chaudhari ◽  
Katherine M. Jennings ◽  
Stephen L. Meyers
Keyword(s):  
Weed Control ◽  
Field Studies ◽  
Application Rate ◽  
Research Station ◽  
Herbicide Resistant ◽  
Horticultural Crops ◽  
Experiment Station ◽  
Leaf Distortion

AbstractThe investigation of potential herbicides for weed control in sweetpotato is critical due to the limited number of registered herbicides and the development of populations of herbicide- resistant weeds. Therefore, field studies were conducted at the Horticultural Crops Research Station, Clinton, NC and the Pontotoc Ridge–Flatwoods Branch Experiment Station, Pontotoc, MS to determine the effect of oryzalin application rate and timing on sweetpotato tolerance. Oryzalin at 0.6, 1.1, 2.2, 3.4, and 4.5 kg ai ha–1was applied immediately after transplanting or 14 d after sweetpotato transplanting (DAP). At Clinton, oryzalin applied immediately after transplanting resulted in ≤1% leaf distortion 4 and 6 wk after transplanting (WAP) regardless of application rate. However, when oryzalin was applied 14 DAP, greater sweetpotato leaf distortion was observed from 2.2, 3.4, and 4.5 kg ha–1(≤8%) than 0.6 and 1.1 kg ha–1(≤4%). At Pontotoc, oryzalin applied immediately after transplanting resulted in ≤6% leaf distortion 4 WAP regardless of application rate. However, when oryzalin was applied at 14 DAP, greater leaf distortion was reported from 3.4 and 4.5 kg ha–1(11 to 13%) than 0.6, 1.1, and 2.2 kg ha–1(4 to 6%). Oryzalin application rate and timing did not affect yield of no.1, jumbo, or marketable sweetpotato. Based on these results, oryzalin herbicide has potential for registration in sweetpotato.

Note on Oviposition in Plant Stems by Grasshoppers (Orthoptera: Acrididae)

1963 ◽  
Vol 95 (5) ◽  
pp. 556-557
Author(s):  
R. Pickford ◽  
M. E. Taylor
Keyword(s):  
Small Diameter ◽  
Egg Laying ◽  
Research Station ◽  
Sweet Clover ◽  
Insect Eggs ◽  
Grass Roots ◽  
Salsola Kali ◽  
Right Of Way ◽  
Melilotus Alba ◽  
Decaying Wood

Most species of grasshoppers in North America appear to lay their eggs in soil or among grass roots. A variation of this habit was reported in Manitoba by Criddle (1933) who states that Chloealtis conspersa Harr. and Neopodismopsis abdominalis (Thom.) oviposit exclusively in decaying wood or in dung.Recently, a few stems of sweet clover, Melilotus alba Desv., and Russian thistle, Salsola kali L. var. tenuifolia Tausch, that contained insect eggs, were sent to the Saskatoon Research Station by A. Vadeboncoeur of Val Marie in southwestern Saskatchewan. These eggs were laid in the pithy centres of the stems in groups of eight or nine (Fig. 1). According to the sender, the clover had been cut during the summer and the thistle was about two years old. Both were lying in the ditch on the railroad right-of-way. At our request, Mr. Vadeboncoeur sent in a few more infested stems. From a total of about 10 samples it seems evident that oviposition in plant stems is typical of the grasshopper involved. The exact egg-laying procedure is difficult to visualize in view of the small diameter of the pith (approximately 3 mm.), and the lack of any sign of penetration through the side of the stem. Inserting its abdomen into the narrow stem and depositing the eggs 25 to 30 mm. from the cut end of the stem must have involved considerable gymnastic manoeuvring by the female grasshopper.

scholarly journals Environmental Consequences of Efficient Use of Nitrogen Fertilizers

2002 ◽  
pp. 41-46
Author(s):  
Gheorghe Ciobanu ◽  
Cornelia Ciobanu ◽  
Cornel Domuta ◽  
Nicolae Csep ◽  
Petru Burescu
Keyword(s):  
Application Rate ◽  
N Fertilizer ◽  
Nitrogen Fertilizers ◽  
Fertilizer Efficiency ◽  
Research Station ◽  
Environmental Consequences ◽  
Actual Use ◽  
Use Efficiency ◽  
Effect On Yield ◽  
Set Up

Nitrogen fertilizer represents major economic burden. For this reason, although the efficiency of nitrogen utilization varies highly, its actual use generally remains at low levels; these averaging between 25 and 50%. We set up an experiment at the Oradea Research Station, using 15N labeled fertilizers, in order to investigate the possibility of increasing N fertilizer efficiency in winter wheat under irrigation conditions.Fertilizers labeled with 15N allows us to individually determine its effect on yield formation, as well as the use efficiency of N from fertilizer following application rate and time. The amount of N derived from fertilizer as determined in straw and grain yield is high. When the labeled fertilizer is applied at tillering time, the values of this indicator rise when higher N levels we applied.In separate experiments, we investigated a series of aspects connected to chemical fertilizer regarding the determination of the type of fertilizer, optimum time and rates of application; all these as a function of the special pedoclimatic conditions.The results obtained in the field show that the effectiveness of N utilization in wheat is most variable and generally low, often ranging between 25 and 33%, owing to N loss within the system through leaching and NH3 volatilization.A readily achievable increase in efficiency of 5 percentage points would result in considerable savings, and can be brought about by reducing nitrogen losses. The added benefits to the environment in terms of reduced ground/water contamination and lowered nitrous oxide (N20) emissions would also be substantial.The figures for N fertilizer use efficiency (% N range from 35.5 to 72.6, the highest value being recorded with an N application of 120 kg/ha at tillering, when the previous crop was sunflower).INTRODUCTION

scholarly journals Nutrient use Efficiency in Calcareous Soil Amended by the Silicate, Humate and Compost

2021 ◽  
pp. 1-12
Author(s):  
Dalal H. Sary ◽  
Rama T. Rashad
Keyword(s):  
Calcareous Soil ◽  
Agricultural Research ◽  
Block Design ◽  
N Uptake ◽  
Nutrient Use Efficiency ◽  
Application Rate ◽  
Research Station ◽  
Application Rates ◽  
Nutrient Use ◽  
Use Efficiency

Aims: A study was carried out in the field aims to study the response of a calcareous soil cultivated by soybean to the application of K-silicate (K-Si), K-humate (K-H), and compost at application rates 50% and 100% of the recommended dose. Study Design: Complete randomized block design with three replicates. Place and Duration of Study: At El-Nubaryia Agricultural Research Station (latitude of 30° 30°N longitude of 30° 20°E) Agricultural Research Center (ARC), Nubaryia, Egypt (Summer seasons of 2018 and 2019). Methodology: Compost was mixed with surface soil a week before cultivation at application rates 3.75 and 7.5 kg plot-1 (3.91 and 7.81 t ha-1, respectively). Powder K-H was spread on soil at application rates 7.5 and 15 g plot-1 while aqueous solutions of K-Si; 8 and 16 mL L-1 for plot was sprayed on soil 30, 60, and 90 days after cultivation. Results: Results showed that soil moisture(SM, %) was increased by the 100% application rate in the order compost (20.6%) > K-Si (19.3%) > K-H (19.1%). A significant increase was found in the seed yield (kg ha-1) by 129.5%, 84.8% and 70.6% by compost, K-H and K-Si, respectively. Compost at 100% application rate showed the most significant increase in the available nitrogen N (mg kg-1) in soil by 104.4% followed by K-H (by 81.8%) then K-Si by 23.4%. Compost also showed the most significant increase in the N uptake from soil (kg ha-1 soil) by seeds and straw followed by K-H then K-Si. The nutrient use efficiency (NUE, %) and agronomic efficiency (AE) values decreased in the order K-H > K-Si > compost at 50% and 100% application rates. Conclusion: The quite smaller dose and ease of field application by spraying may make the K-H more agronomically efficient than K-Si and compost.

scholarly journals Simulated drift of dicamba: effect on the physiological quality of soybean seeds

2020 ◽  
Vol 42 ◽  
Author(s):  
Estevam Matheus Costa ◽  
Jacson Zuchi ◽  
Matheus Vinícius Abadia Ventura ◽  
Leandro Spíndola Pereira ◽  
Geovani Borges Caetano ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Seed Germination ◽  
Soybean Seed ◽  
Application Rate ◽  
Soybean Seeds ◽  
Before And After ◽  
Physiological Quality ◽  
Herbicide Drift ◽  
Phenological Phases

Abstract: The release of soybean varieties resistant to dicamba herbicide leads to the possibility of dicamba herbicide drift into soybean seed production fields and reduction in the physiological quality of soybean seeds. The aim of this study was to evaluate the physiological quality of soybean seeds as a function of the application of reduced rates of dicamba in two phenological phases. A randomized block experimental design was used, with four replications. The 4 × 2 + 1 factorial arrangement consisted of four reduced rates (0.028, 0.28, 2.8 and 28 g.ha-1) of dicamba applied in the V4 and R2 stages + a control. The physiological quality of the seeds was evaluated after harvest and at six months after storage at 20 °C. At the rate of 28 g.ha-1 of dicamba applied in the V4 and R2 stages, seed germination declined by 15% and 42%, respectively. After storage, seeds under the 28 g.ha-1 dicamba treatment had 64% lower germination compared to the lowest application rate evaluated, and electrical conductivity doubled in relation to the control. The physiological quality of soybean seeds declines under these reduced rates of dicamba applied in the V4 and R2 stages, both before and after storage.

Some Aspects of Right-of-Way Brush Control with 2,4,5-T and 2,4-D

Weeds ◽  
1954 ◽  
Vol 3 (1) ◽  
pp. 21 ◽  
Author(s):  
L. L. Coulter
Keyword(s):  
Right Of Way ◽  
Brush Control
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