Effect of Soil pH on Adsorption and Persistence of Imazaquin

Weed Science ◽  
1992 ◽  
Vol 40 (3) ◽  
pp. 490-496 ◽  
Author(s):  
Mark M. Loux ◽  
Kirk D. Reese
Keyword(s):  
Organic Matter ◽  
Soil Ph ◽  
Microbial Degradation ◽  
Field Studies ◽  
Soil Conditions ◽  
Silt Loam ◽  
Herbicide Application ◽  
Dry Soil ◽  
Decreasing Ph ◽  
Ph Range

Laboratory and field studies were conducted in 1988 through 1990 to determine the effect of soil pH on imazaquin adsorption and persistence in a Crosby silt loam (1.6% organic matter) and a Hoytville clay (3.3% organic matter). Above a pH of 6, 6 to 7% of the total imazaquin present was adsorbed to both soils. Adsorption increased as pH decreased from about 7 to 4.5, with a maximum of 16.5 and 31% adsorbed on Crosby and Hoytville soils, respectively. Imazaquin was more persistent in the Hoytville clay than in the Crosby silt loam. Herbicide dissipated more slowly in both soils in 1988 than in 1989 due to dry soil conditions immediately prior to and following herbicide application in 1988. In both soils, imazaquin persistence increased as soil pH decreased, over a pH range from 6.5 to 4.5. Increased persistence with decreasing pH was attributed in part to increased adsorption and decreased availability for microbial degradation.

Effect of Soil Type and pH on Persistence and Carryover of Imidazolinone Herbicides

1993 ◽  
Vol 7 (2) ◽  
pp. 452-458 ◽  
Author(s):  
Mark M. Loux ◽  
Kirk D. Reese
Keyword(s):  
Organic Matter ◽  
Soil Ph ◽  
Soil Type ◽  
Field Studies ◽  
Yield Reduction ◽  
Silt Loam ◽  
Imidazolinone Herbicides ◽  
Significant Injury

Field studies were conducted in 1988 through 1990 to determine the effect of soil pH, over a 4.5 to 6.5 range, on imazethapyr persistence and on imazaquin and imazethapyr carryover to ‘Pioneer 3377’ corn in a Crosby silt loam (1.6% organic matter) and a Hoytville clay (3.3% organic matter). Imazethapyr appeared to be more persistent in Hoytville clay than in Crosby silt loam. In Crosby silt loam, imazethapyr persistence increased as pH decreased, whereas soil pH did not affect persistence in Hoytville clay. Imazaquin or imazethapyr did not affect corn grown the year following application to Crosby silt loam. Imazethapyr applied to Hoytville clay did not cause significant injury or yield reduction to corn. Carryover of imazaquin in Hoytville clay caused corn injury and yield reduction, increased as pH decreased, and was more evident at 280 g ai ha−1than at 140 g ha−1.

scholarly journals Efficacy of Four B.T., Japonica BUI BUI, Formulations on Japanese Beetle Grubs, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 371-371
Author(s):  
Stanley R. Swier ◽  
Alan Rollins ◽  
Bryan Carney
Keyword(s):  
Organic Matter ◽  
Soil Ph ◽  
Dry Matter ◽  
Weather Conditions ◽  
Post Treatment ◽  
Soil Conditions ◽  
Silt Loam ◽  
Japanese Beetle ◽  
Time Of Application ◽  
Country Club

Abstract This trial was conducted at Amherst Country Club, Amherst, NH. The lawn was mowed at 1.5 inches and irrigated daily (0.1 inch). All treatments were applied on 19 Aug to 7 X 11 ft plots with 1-ft buffers, replicated 5 times in an RCB design. Liquid formulations were applied with a 2-wheel bicycle-type CO2 boom sprayer equipped with 4 spray heads fitted with a 50-mesh strainer and an 8004 fan-type nozzle. The volume of water and insecticide mix per plot was 2 gal/1000 ft2 delivered at 40 psi. Granular formulations were evenly dispersed using large plastic salt shakers. The surface of the turf was free of moisture (dew) at time of application. The plots were irrigated post-treatment with 0.4 in of water. Grubs were primarily 2nd instar. Weather conditions at time of application were as follows. Air, temp; 78°F; sky, clear; wind, moderate breeze. Soil conditions were as follows: surface temp, 80°F; at 1-inch depth, 76°F; at 2-inch depth, 75°F; soil pH, 5.6; texture, silt loam; sand, 50%; silt, 43%; clay, 7%; dry matter, 81%; moisture, 19%; organic matter, 5%. The trial was rated on 20 Sep using a Ryan 18-inch sod cutter to cut the plots to a depth of 3/4 inch. A 3 ft2 piece of sod was moved and live grubs counted.

scholarly journals Full Season Control of Japanese Beetle Grub Control with Merit, NH, 1994

1996 ◽  
Vol 21 (1) ◽  
pp. 352-352
Author(s):  
Stanley R. Swier
Keyword(s):  
Organic Matter ◽  
Soil Moisture ◽  
Soil Organic Matter ◽  
Air Temperature ◽  
Soil Ph ◽  
Soil Texture ◽  
Clay Soil ◽  
Golf Course ◽  
Silt Loam ◽  
Japanese Beetle

Abstract The trial was conducted 10 May on a golf course rough, Amherst, NH. Plots were 10 X 10 ft, replicated 4 times, in a RCB design. Merit WP was applied in 4 gal water/1000 ft2 with a watering, can. Merit G granules were applied with a homemade salt shaker. Treatments were irrigated with 0.5 inch water after application. Plots were rated 30 Sep by counting the number of live grubs per 1 ft2. Conditions at the time of treatment were: air temperature 70°F; wind, 3 MPH; sky, clear; soil temperature, 1 inch, 60°F; thatch depth, 0.5 inch soil pH, 5.4; slope 0%; soil texture, silt loam, 47% sand, 50% silt, 3% clay; soil organic matter, 6.9%; soil moisture, 21.8%.

Atrazine Dissipation as Affected by Surface pH and Tillage

Weed Science ◽  
1980 ◽  
Vol 28 (1) ◽  
pp. 101-104 ◽  
Author(s):  
J. J. Kells ◽  
C. E. Rieck ◽  
R. L. Blevins ◽  
W. M. Muir
Keyword(s):  
Weed Control ◽  
Soil Ph ◽  
Field Studies ◽  
Conventional Tillage ◽  
Field Conditions ◽  
No Tillage ◽  
Tillage Systems ◽  
Surface Ph ◽  
Factors Affecting ◽  
Decreasing Ph

Field studies and laboratory analyses were conducted to examine factors affecting degradation of14C-atrazine [2-chloro-4-(ethylamine)-6-(isopropylamino)-s-triazine] under field conditions. The effects of these factors on weed control under no-tillage and conventional tillage systems were also examined. The amount of radioactivity which was unextractable in 90% methanol increased with time following treatment with14C-atrazine. The rate of formation of unextractable14C compounds was greater under no-tillage and increased with decreasing pH. After 14 to 18 days, a greater amount of extractable atrazine was present in areas receiving lime. The degradation of atrazine occurred more rapidly when surface pH was less than 5.0 compared with a pH greater than 6.5. The effect of lime on the amount of parent atrazine present in the soil was directly correlated to its effect on soil pH. Extractable atrazine in the soil 45 days after treatment was significantly correlated with weed control with the greatest effect under no-tillage.

Metolachlor and Alachlor Persistence in Rice (Oryza sativa) Following Soybean (Glycine max)

1989 ◽  
Vol 3 (1) ◽  
pp. 82-85 ◽  
Author(s):  
James L. Griffin ◽  
John F. Robinson
Keyword(s):  
Oryza Sativa ◽  
Glycine Max ◽  
Residual Effect ◽  
Field Studies ◽  
Silt Loam ◽  
Herbicide Application ◽  
Rice Yields ◽  
Residue Levels ◽  
Soil Residue

Field studies were conducted for 3 yr to evaluate the persistence of metolachlor and alachlor applied to ‘Centennial’ soybean and to determine their residual effect on ‘Mars' rice. At labeled use rates of metolachlor at 2.8 kg ai/ha and alachlor at 3.9 kg ai/ha, soil residue levels in the fall 5 months after application on Crowley and Midland silt loam soils averaged 0.04 and 0.05 ppmw, respectively. Metolachlor fall soil residues averaged 3.5 times higher when applied at 5.6 and 11.2 kg/ha compared to 2.8 kg/ha, but residues for labeled and double rates of alachlor were similar. In the spring 9 months after herbicide application, soil residues averaged over years did not exceed 0.06 ppmw. The 3-yr rice yields were not affected by residual metolachlor or alachlor.

Comparison of Two Nematode Formulations for Black Turfgrass Ataenius Control, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 371-371
Author(s):  
Stanley R. Swier ◽  
Alan Rollins ◽  
Bryan Carney
Keyword(s):  
Organic Matter ◽  
Soil Ph ◽  
Dry Matter ◽  
Sandy Loam ◽  
Weather Conditions ◽  
Soil Conditions ◽  
Time Of Application ◽  
Country Club

Abstract This trial was conducted at Wentworth-By-The-Sea Country Club, New Castle, NH. All treatments were applied to a fairway on 15 Jul on 7 X 7 ft plots, 5 replicates per treatment, using an RCB design with 1 -ft buffers between plots. Treatments were applied with a 2-wheel bicycle-type CO2 boom sprayer equipped with 4 spray heads, fitted with a 50-mesh strainer and an 8004 fan-type nozzle. The volume of water and insecticide mix per plot was 2 gal/1000 ft2 delivered at 40 psi. The entire trial was irrigated with 1/2 inch of water immediately after application. Weather conditions at time of application were as follows: air temp, 72°F; sky, cloudy; wind, strong breeze. Soil conditions were as follows: surface temp, 70°F; at 1-inch depth, 71°F; at 2-inch depth, 71°F; texture, sandy loam; sand, 67%; silt, 27%; clay, 6%, soil pH, 6.0; dry matter, 74%; moisture, 26%; organic matter, 12%; thatch depth, 1/4 inch. The trial was rated on 5 Aug. A Ryan 12” sod cutter was used to cut a strip to a depth of 3/4 inch. A 1 ft2 piece of sod was pealed back, and live grubs were counted.

Influence of Soil pH ons-Triazine Availability to Plants

Weed Science ◽  
1975 ◽  
Vol 23 (5) ◽  
pp. 378-382 ◽  
Author(s):  
J. A. Best ◽  
J. B. Weber ◽  
T. J. Monaco
Keyword(s):  
Zea Mays ◽  
Glycine Max ◽  
Gossypium Hirsutum ◽  
Soil Ph ◽  
Field Studies ◽  
Silt Loam

Field studies indicated that liming an acid Bladen silt loam from pH 5.5 to 7.5 increased the phytotoxicity of atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] and prometryn [2,4-bis-(isopropylamino)-6-methyoxy-s-triazine]. Liming greatly increased the persistence of atrazine, but did not affect prometryn dissipation. Liming increased the14C-concentration present in the shoots of corn (Zea MaysL. ‘Pioneer 3369A’), cotton (Gossypium hirsutumL. ‘Coker 201’), and soybeans [Glycine Max(L.) Merr. ‘Ransom’] from soil treated with14C-ring labeled atrazine, prometryn, and hydroxyatrazine [2-hydroxy-4-(ethylamino)-6-(isopropylamino)-s-triazine] in greenhouse studies. Decreases in14C-uptake by the crops were associated with adsorption and degradation of the compounds in the soil. Atrazine was taken up in much greater amounts than hydroxyatrazine. Cotton absorbed less of thes-triazines than soybeans or corn from soil.

scholarly journals Comparison of Three Rates of a Growth Regulator on Black Cutworm, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 353-353
Author(s):  
Stanley R. Swier ◽  
Alan Rollins ◽  
Bryan Carney
Keyword(s):  
Organic Matter ◽  
Soil Ph ◽  
Growth Regulator ◽  
Soil Texture ◽  
Dry Matter ◽  
Weather Conditions ◽  
Soil Conditions ◽  
Black Cutworm ◽  
Country Club

Abstract Two trials were conducted at Amherst Country Club, Amherst, NH. In the first trial treatments were applied on 6 Sep to a bentgrass nursery and rated 13 Sep. In the second, treatments were applied 12 Sep and rate 19 Sep. The treatments were applied in an RCB design, 4 replicates per treatment, with 1 -ft buffers between plots. All treatments were applied with a 2-wheel bicycle-type CO2 boom sprayer, using four 8004 nozzles with 50-mesh screens. The volume of water and insecticide mix per plot was 2 gal/1000ft2 delivered at 40 psi. BCW larvae were predominantly 3rd-4th instar in the 1st trial and 1 st-2nd instar in the 2nd trial. Weather conditions were as follows: on 6 Sep, air temp, 81°F; sky, clear; wind, calm. Soil conditions were as follows: surface temp, 83°F; temp at 1-inch depth, 74°F; soil pH, 5.7; dry matter, 80%; moisture, 20%; organic matter, 4%; soil texture, loam; sand, 60%; silt, 20%; clay, 20%. On 12 Sep, air temp was 74°F; soil temp at surface was 71°F; at 1-inch depth, 69°F. The trials were rated for live larvae by soaking each plot with Joy dish soap and water to force larvae to the surface.

Curative Black Cutworm Control With Merit and Fcr 4S4S, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 327-327
Author(s):  
Stanley R. Swier ◽  
Alan Rollins
Keyword(s):  
Organic Matter ◽  
Soil Moisture ◽  
Soil Organic Matter ◽  
Air Temperature ◽  
Soil Ph ◽  
Soil Texture ◽  
Fourth Instar ◽  
Silt Loam ◽  
Black Cutworm ◽  
Country Club

Abstract Three treatments were applied to third and fourth instar BCW larvae at Amherst Country Club. Plots were 7 X 7 ft, replicated 4 times, in a RCB design. Treatments were applied 7 Sep and rated 14 Sep (7 DAT). Treatments were applied with a CO2 boom sprayer, 8004 nozzles, at 40 PSI, in 2 gal water per 10002. Plots were rated using a soap flush and counting the number of emerging larvae. Conditions at the time of treatment were: air temperature, 84.3°F; wind, calm; sky, cloudy; soil temperature, 77.3°F; thatch depth, 0.25 inch; soil pH, 5.7; slope, 0%; soil texture, silt loam: sand 40%, silt 59%, clay 1%; soil organic matter, 3.7%; soil moisture, 22.6%; post treatment precipitation, 0.1 inch daily; mowing height, 0.187 inch.

Short-term effects of three animal manures on soil pH and Al solubility

Soil Research ◽  
2006 ◽  
Vol 44 (5) ◽  
pp. 515 ◽  
Author(s):  
F. X. Naramabuye ◽  
R. J. Haynes
Keyword(s):  
Organic Matter ◽  
Soil Solution ◽  
Soil Ph ◽  
Solid Phase ◽  
Poultry Manure ◽  
Soluble Organic Matter ◽  
Equilibrium Solutions ◽  
Short Term ◽  
Animal Manures ◽  
Ph Range

A short-term (3-day) equilibration experiment was carried out to determine the effects of 3 animal manures (poultry, pig, and cattle) added at a rate of 20 mg/g to an Oxisol on pH and the concentrations of total (AlT) and monomeric (AlMono) Al in solution. The pH of equilibrium solutions from the control, cattle, pig, and poultry manure treatments were 4.0, 4.6, 5.2, and 6.3, respectively. AlMono concentrations decreased progressively as pH increased but concentrations of AlT were similar in the pig and poultry manure treatments. Subsequent equilibration experiments examined the solubility of AlMono and AlT when the 3 manures were added to the Oxisol or a 40 um AlCl3 solution and pH was maintained at 4.0, 4.5, 5.0, 5.5, 6.0, and 6.5. In both experiments, addition of manures generally tended to reduce the concentration of AlT in the lower pH range (4.0 and 4.5) but increase it in the higher range (pH 5.5 or 6.0 and above). Concentrations of AlMono, and the proportion of AlT present as AlMono, were reduced over the whole pH range. Results were explained in terms of the strong bonding ability of organic matter in both the solid and solution phases for Al. At lower pH, where Al is highly soluble, complexation by solid-phase organic matter results in a reduction in both AlT and AlMono. However, at higher pH, where Al solubility becomes limited, complexation of Al by soluble organic matter becomes an important mechanism and this results in an elevation in AlT, while concentrations of AlMono remain very low. It was concluded that the effects of manures in reducing concentrations of AlMono in soil solution are attributable to both an increase in pH and the complexing ability of organic matter for Al.

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