Combinations of Nonselective Herbicides for Difficult to Control Weeds in No-Till Corn,Zea mays, and Soybeans,Glycine max

Weed Science ◽  
1988 ◽  
Vol 36 (5) ◽  
pp. 648-652 ◽  
Author(s):  
John S. Wilson ◽  
A. Douglas Worsham
Keyword(s):  
Zea Mays ◽  
Glycine Max ◽  
Weed Control ◽  
The Other ◽  
Corn Yield ◽  
Weed Species ◽  
Common Ragweed ◽  
No Till

The combination of glyphosate and 2,4-D at various rates was evaluated for controlling existing weeds at planting in no-till corn and soybeans. Herbicide combinations in soybeans also included paraquat plus 2,4-D, linuron, or diuron. Standard treatments included glyphosate (0.6 and 1.1 kg ae/ha) and paraquat (0.3 and 0.6 kg ai/ha), and 2,4-D (0.6 kg ae/ha) alone. For corn, the addition of 2,4-D to glyphosate did not improve weed control, although the addition of 2,4-D to paraquat did improve horseweed control. Corn yield with the herbicide combinations was higher than that for the nonselective herbicides alone. Although initial weed control was good in soybeans, weed regrowth in all paraquat alone treatments was substantial, especially with horseweed. The addition of 2,4-D to paraquat improved control of horseweed and tall morningglory. The addition of linuron or diuron to paraquat improved horseweed and common ragweed control, whereas the addition of 2,4-D to glyphosate improved the control of tall morningglory but not the other weed species. Generally, after 4 weeks, all glyphosate treatments provided better horseweed control than all paraquat treatments. Paraquat plus either linuron or diuron and glyphosate alone or in combination with 2,4-D gave the highest soybean yields.

Decreasing Rates of Nonselective Herbicides in Double-Crop No-Till Soybeans (Glycine max)

1991 ◽  
Vol 5 (1) ◽  
pp. 198-201 ◽  
Author(s):  
Carroll M. Moseley ◽  
Edward S. Hagood
Keyword(s):  
Glycine Max ◽  
Weed Control ◽  
Production Systems ◽  
Weed Species ◽  
Control Efficacy ◽  
Common Ragweed ◽  
Soybean Production ◽  
No Till ◽  
Large Crabgrass

Experiments were conducted in 1988 and 1989 at four sites in Virginia to test weed control efficacy in double-crop, no-till soybean production systems with reduced rates of nonselective herbicides. Chlorimuron plus linuron at 0.04 plus 0.46 kg ha-1gave more than 94% control of five weed species, but only 81 to 86% control of three weed species. Tank mix additions of reduced rates of either glyphosate, HOE-0661 or paraquat to the chlorimuron plus linuron treatment increased large crabgrass and common ragweed control.

Influence of Application Method on the Activity of Butylate and EPTC in Reduced-Tillage Corn (Zea mays)

Weed Science ◽  
1987 ◽  
Vol 35 (3) ◽  
pp. 412-417 ◽  
Author(s):  
Douglas D. Buhler
Keyword(s):  
Zea Mays ◽  
Weed Control ◽  
The Other ◽  
Growth Chamber ◽  
Reduced Tillage ◽  
Corn Yield ◽  
Liquid Fertilizer ◽  
Application Method ◽  
Control Growth ◽  
Application Methods

Weed control in reduced-tillage corn (Zea maysL. ‘Pioneer 3732′) with butylate [S-ethyl bis(2-methylpropyl) carbamothioate] and EPTC (S-ethyl dipropyl carbarnothioate) was not reduced when these herbicides were applied jointly with dry or liquid fertilizer. In most cases, application with fertilizer resulted in weed control similar to that observed when the herbicide was applied in water at 285 L/ha. Butylate applied as a granular formulation also gave weed control similar to the spray at 285 L/ha. Application in 95 L/ha of water consistently resulted in reduced weed control. Corn injury was not greatly influenced by application method, and differences in corn yield appeared to be due to differences in weed control. Growth chamber bioassays indicated that both butylate and EPTC dissipated more rapidly when applied in 95 L/ha of water than the other application methods, which may explain differences in weed control observed in the field.

Long-Term Control of Perennial Broadleaf Weeds and Triazine-Resistant Common Lambsquarters (Chenopodium album) in No-Till Corn (Zea mays)

1997 ◽  
Vol 11 (3) ◽  
pp. 436-443 ◽  
Author(s):  
Scott Glenn ◽  
William H. Phillips ◽  
Pablo Kalnay
Keyword(s):  
Zea Mays ◽  
Weed Control ◽  
Chenopodium Album ◽  
Yield Response ◽  
Corn Yield ◽  
Common Lambsquarters ◽  
No Till

Control and regrowth of hemp dogbane, wild blackberry, and triazine-resistant common lambsquarters (TR-CHEAL) were studied in no-till corn from 1992 to 1994. Hemp dogbane, wild blackberry, and TR-CHEAL population increased 10, 123, and 177%, respectively, between 1992 and 1994 in plots treated with PRE applications of paraquat, atrazine, and metolachlor (weedy checks). POST applications of tank mixtures of 35 g ai/ha nicosulfuron or 20 g/ha primisulfuron with 280 g/ha 2,4-D or 140 g/ha dicamba, and 560 g/ha dicamba applied alone controlled hemp dogbane, wild blackberry, and TR-CHEAL 67 to 98%. These treatments reduced the population or prevented expansion of these weeds the year following treatment. In 1992, corn yield response to weed control was inconsistent. In 1993 and 1994, all plots treated with POST herbicides yielded higher than the weedy check. Corn yield of plots treated with combinations of nicosulfuron or primisulfuron with 2,4-D or dicamba and 560 g/ha dicamba applied alone were 102 to 149% and 124 to 153% higher than the weedy check in 1993 and 1994, respectively.

Weed Control in Oat (Avena sativa)-Alfalfa (Medicago sativa) and Effect on Next Year Corn (Zea mays) Yield

1992 ◽  
Vol 6 (4) ◽  
pp. 871-877
Author(s):  
Russell S. Moomaw
Keyword(s):  
Zea Mays ◽  
Weed Control ◽  
Avena Sativa ◽  
Field Experiments ◽  
Corn Yield ◽  
No Till ◽  
Green Foxtail ◽  
Second Year ◽  
One Year ◽  
Forage Yields

Field experiments were conducted from 1985 through 1989 to evaluate herbicide selectivity and impact on seeding-year yields of spring oat and underseeded alfalfa, and carryover weed control benefits from increased legume-fixed N for second-year dryland no-till corn. PRE metolachlor, pendimethalin, and prodiamine controlled green foxtail and POST bromoxynil or 2,4-DB controlled broadleaf weeds. These herbicides caused 0 to 20% alfalfa injury and 0 to 17% oat injury, and increased oat yield one of three years but did not increase the yield of underseeded alfalfa. POST pyridate, thifensulfuron, and tribenuron were too injurious to either oat, alfalfa, or both crops. Forage yields of annual ‘Nitro’ and perennial ‘Wrangler’ alfalfa seeded alone were greater than when they were underseeded in oat, with herbicides applied in both systems. As a result of drought in 1988 and 1989, yield of second-year corn planted after one-year alfalfa was not increased from potentially greater legume-fixed N. Dryland corn yield following monoculture oat or corn was 254% higher than corn following alfalfa.

Influence of Herbicide Application Rate, Timing, and Interrow Cultivation on Weed Control and Corn (Zea mays) Yield in Glufosinate-Resistant and Glyphosate-Resistant Corn

1999 ◽  
Vol 13 (4) ◽  
pp. 807-813 ◽  
Author(s):  
Brent E. Tharp ◽  
James J. Kells
Keyword(s):  
Zea Mays ◽  
Weed Control ◽  
Field Trials ◽  
Application Rate ◽  
Corn Yield ◽  
Herbicide Application ◽  
Weed Species ◽  
Application Timing ◽  
Glufosinate Ammonium ◽  
Application Rates

Field trials were conducted in 1996 and 1997 to determine the influence of glufosinate and glyphosate application rates, application timings, and interrow cultivation on weed control and corn yield. Glufosinate-ammonium rates ranged from 0.18 to 0.41 kg ai/ha, while rates for the isopropylamine salt of glyphosate ranged from 0.21 to 0.84 kg ae/ha. Increasing rates of glufosinate and glyphosate often improved weed control. Control of many of the weed species was improved by delaying herbicide application timing. Weed control was most consistent from late postemergence (LPOST) applications of glufosinate at 0.41 kg ai/ha or glyphosate at 0.84 kg ae/ha. Corn yields were reduced due to incomplete weed control when the lowest rate of glufosinate was applied. Weed control from early postemergence (EPOST) glufosinate and glyphosate applications followed by cultivation was similar to weed control from LPOST glufosinate and glyphosate applications without cultivation. Interrow cultivation following glufosinate or glyphosate application did not affect corn yield.

An Oats (Avena sativa) – Soybean (Glycine max) Rotation Using Ecofarming versus Conventional Tillage

Weed Science ◽  
1985 ◽  
Vol 33 (4) ◽  
pp. 544-550 ◽  
Author(s):  
Russell S. Moomaw
Keyword(s):  
Glycine Max ◽  
Grain Yield ◽  
Weed Control ◽  
Avena Sativa ◽  
Conventional Tillage ◽  
The Other ◽  
Soybean Yield ◽  
No Till ◽  
Crop Injury ◽  
Tillage System

An oats (Avena sativaL.) – no-till soybean [Glycine max(L.) Merr.] ecofarming system was evaluated through four, 2-yr rotations during 1978 through 1982. Herbicides were applied to oats, to oat stubble, and to no-till soybeans for maximum weed control throughout the 2-yr rotation. The treatment sets also included conventional tillage of oat stubble for weed control and preparation of a soybean seedbed. Several herbicides gave effective weed control in oats with minimal crop injury; however, grain yield was not increased by any of the treatments. No recropping problems were encountered when planting no-till soybeans 14 months after application of chlorsulfuron {<2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide)}. Soybean yield under ecofarming was greater 1 yr and equal to that with the conventional-tillage system the other 2 yr.

Time-of-day effect on weed control efficacy with tolpyralate plus atrazine

2020 ◽  
pp. 1-6
Author(s):  
Nicole M. Langdon ◽  
Nader Soltani ◽  
Alan J. Raedar ◽  
David C. Hooker ◽  
Darren E. Robinson ◽  
...  
Keyword(s):  
Weed Control ◽  
Field Experiments ◽  
Time Of Day ◽  
Corn Yield ◽  
Annual Grass ◽  
Weed Species ◽  
Control Efficacy ◽  
Common Ragweed ◽  
Green Foxtail

Abstract Tolpyralate is a new 4-hydroxyphenyl-pyruvate dioxygenase (HPPD)–inhibiting herbicide for weed control in corn. Previous research has reported efficacy of tolpyralate + atrazine on several annual grass and broadleaf weed species; however, no studies have evaluated weed control of tolpyralate + atrazine depending on time-of-day (TOD) of application. Six field experiments were conducted over a 2-yr period (2018, 2019) near Ridgetown, ON, to determine if there is an effect of TOD of application on tolpyralate + atrazine efficacy on common annual grass and broadleaf weeds. An application was made at 3-h intervals beginning at 06:00 h with the last application at 24:00 h. There was a slight TOD effect on velvetleaf, pigweed species, and common ragweed control with tolpyralate + atrazine; however, the magnitude of change throughout the day was ≤3% at 2, 4, or 8 wk after application (WAA). There was no effect of TOD of tolpyralate + atrazine on the control of lambsquarters, barnyardgrass, and green foxtail. All weed species were controlled ≥88% at 8 WAA. There was no effect of TOD of tolpyralate + atrazine application on corn yield. Results of this study show no evidence of a TOD effect on weed control efficacy with tolpyralate + atrazine.

Weed Species Distribution as Influenced by Tillage and Herbicides

Weed Science ◽  
1985 ◽  
Vol 33 (6) ◽  
pp. 853-856 ◽  
Author(s):  
Mark A. Wrucke ◽  
W. Eugene Arnold
Keyword(s):  
Zea Mays ◽  
Glycine Max ◽  
Conventional Tillage ◽  
Setaria Viridis ◽  
Weed Species ◽  
Tillage Systems ◽  
No Till ◽  
Green Foxtail ◽  
Weed Distribution ◽  
Grass Weed

Corn (Zea maysL.) and soybeans [Glycine max(L.) Merr.] were grown for 5 yr in rotation without tillage (no-till), with fall and spring tillage (disk), and with conventional tillage (plow). Weed distribution and weed yields were measured in the final year of the experiment. Grass weed yield, primarily due to green foxtail [Setaria viridis(L.) P. Beauv. ♯ SETVI], was significantly higher in the no-till system. Broadleaf weed distribution and yield were similar in all tillage systems.

Herbicide Evaluations for No-Till Soybean (Glycine max) Production in Corn (Zea mays) Residue

Weed Science ◽  
1985 ◽  
Vol 33 (5) ◽  
pp. 679-685 ◽  
Author(s):  
Russell S. Moomaw ◽  
Alex R. Martin
Keyword(s):  
Zea Mays ◽  
Acetic Acid ◽  
Glycine Max ◽  
Weed Control ◽  
Herbicide Application ◽  
Surface Application ◽  
Weed Growth ◽  
No Till ◽  
Herbicide Treatments ◽  
Dichlorophenoxy Acetic Acid

Weed control in no-till soybeans [Glycine max(L.) Merr. ‘Wells’] planted into shredded corn (Zea maysL.) residue was evaluated at Concord, NE, over a 3-yr period. Herbicide factors evaluated were time of herbicide application for no-till soybeans, efficacy of glyphosate [N-(phosphonomethyl)glycine] relative to paraquat (1,1’-dimethyl-4,4’-bipyridinium ion) for control of emerged weeds, and the efficacy of alachlor [2-chloro-2’,6’-diethyl-N-(methoxymethyl)acetanilide], metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide], oryzalin (3,5-dinitro-N4,N4-dipropylsulfanilamide), and pendimethalin [N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine] for residual weed control. Combination residual and contact herbicide treatments were applied either as a preplant surface application or preemergence after no-till-planted soybeans. Removal of existing weed growth was not consistently better with the preplant surface application compared to later removal after soybean planting. Paraquat and glyphosate gave nearly equal control of emerged weeds. Addition of 2,4-D [(2,4-dichlorophenoxy)acetic acid] with paraquat in the tank mix did not improve weed control. Use of narrow, ripple coulters on the no-till planter resulted in minimal disturbance of the preplant surface herbicide so that additional preemergence herbicide at planting was seldom beneficial.

Influence of Tillage and Herbicides on Weed Control in a Wheat (Triticum aestivum)–Soybean (Glycine max) Rotation

Weed Science ◽  
1986 ◽  
Vol 34 (4) ◽  
pp. 590-594 ◽  
Author(s):  
Henry P. Wilson ◽  
Martin P. Mascianica ◽  
Thomas E. Hines ◽  
Ronald F. Walden
Keyword(s):  
Triticum Aestivum ◽  
Glycine Max ◽  
Weed Control ◽  
Field Studies ◽  
Conventional Tillage ◽  
Weed Species ◽  
Stellaria Media ◽  
Grain Yields ◽  
No Till ◽  
Anthemis Arvensis

Field studies were conducted for 4 yr to investigate the effects of tillage and herbicide programs on weed control and wheat (Triticum aestivumL. ‘Potomac’ in 1981 and ‘Wheeler’ from 1982 to 1984) grain yields in a wheat-soy bean [Glycine max(L.) Merr.] double-crop rotation. Predominant weed species were common chickweed [Stellaria media(L.) Vill. # STEME], corn chamomile (Anthemis arvensisL. # ANTAR), and annual bluegrass (Poa annuaL. # POAAN) at the onset of research and cheat (Bromus secalinusL. # BROSE) and soft brome (Bromus mollisL. # BROMO) at the conclusion of the study. Control of all species was excellent with conventional tillage and no-till plus nonselective herbicides but was significantly less with no-till without nonselective herbicides and with minimum tillage. After 4 yr, maximum wheat grain yields were significantly higher in conventional- than in minimum- or no-till systems.

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