Response of no-till and conventionally planted grain sorghum to weed control method and row spacing

1990 ◽  
Vol 129 (2) ◽  
pp. 117-120 ◽  
Author(s):  
U. R. Bishnoi ◽  
D. A. Mays ◽  
M. T. Fabasso
Keyword(s):  
Weed Control ◽  
Control Method ◽  
Grain Sorghum ◽  
Row Spacing ◽  
No Till

Weed Control in a Conservation Tillage Rotation in the Texas Blacklands

Weed Science ◽  
1987 ◽  
Vol 35 (5) ◽  
pp. 695-699 ◽  
Author(s):  
Steven M. Brown ◽  
James M. Chandler ◽  
John E. Morrison
Keyword(s):  
Control Systems ◽  
Weed Control ◽  
Conservation Tillage ◽  
Grain Sorghum ◽  
Control Measures ◽  
Sorghum Halepense ◽  
Low Intensity ◽  
No Till ◽  
Primary Tillage ◽  
And Control

A field experiment was conducted to evaluate weed control systems in a conservation tillage rotation of grain sorghum [Sorghum bicolor(L.) Moench.] – cotton (Gossypium hirsutumL.) – wheat (Triticum aestivumL.). Herbicide systems included fall and spring/summer inputs of high and low intensity. Tillage regimes were no-till (NT) and reduced-till (RT) systems; the latter included fall primary tillage followed by spring stale seedbed planting. Both tillage systems utilized controlled traffic lanes and wide, raised beds. Effective johnsongrass [Sorghum halepense(L.) Pers. # SORHA] control required intense herbicide inputs at one or both application periods, i.e., in the fall and/or spring/summer. Grain sorghum and cotton yields for the most intense weed control system, which included high inputs in both the fall and spring/summer, were not superior to systems that included high inputs in only one of the two application periods. Seedling johnsongrass emergence occurred before spring planting in RT (but not in NT) in 2 of 3 yr, and control measures were ineffective. After 3 yr, the predominant weeds were johnsongrass and browntop panicum (Panicum fasciculatumSw. # PANFA).

Effect of row spacing and herbicide dose on weed control and grain sorghum yield

2004 ◽  
Vol 23 (3) ◽  
pp. 263-267 ◽  
Author(s):  
W.James Grichar ◽  
Brent A. Besler ◽  
Kevin D. Brewer
Keyword(s):  
Weed Control ◽  
Grain Sorghum ◽  
Row Spacing

Weed control and row-spacing in dry-land sorghum in northern New South Wales

1982 ◽  
Vol 22 (117) ◽  
pp. 310 ◽  
Author(s):  
JF Holland ◽  
DW McNamara
Keyword(s):  
Weed Control ◽  
New South ◽  
New South Wales ◽  
Grain Sorghum ◽  
Weed Suppression ◽  
Row Spacing ◽  
Dry Land ◽  
Weed Growth ◽  
South Wales ◽  
Growing Conditions

Six experiments were done in northern New South Wales over three seasons to study the effect of weeds on the yield of dry-land grain sorghum and methods of weed control. The relation between crop row spacing and weed control by inter-row cultivation or atrazine (2-chloro-4-ethylamino- 6-isopropylamino-l,3,5-triazine), or both was studied. Where the site yield was high because of favourable growing conditions, an increase in the crop row spacing reduced yield. At low yielding sites, an increase in the row spacing increased yields. At most sites, weed growth was greater with wider row spacings, which resulted in a larger reduction in crop yield where weeds were not removed. Inter-row cultivation reduced weed growth to less than half that of the unweeded controls. Pre-emergent atrazine gave good weed suppression, generally reducing weed growth to less than 10% of the unweeded control when applied at 2.5 kg/ha active ingredient. Post-emergent atrazine was much less effective. Inter-row cultivation combined with a band of pre-emergent atrazine over the crop row was as effective in weed control as an overall spray of pre-emergent atrazine.

Timing of Chlorimuron and Imazaquin Application for Weed Control in No-Till Soybeans (Glycine max)

Weed Science ◽  
1991 ◽  
Vol 39 (2) ◽  
pp. 232-237 ◽  
Author(s):  
J. Boyd Carey ◽  
Michael S. Defelice
Keyword(s):  
Weed Control ◽  
Field Studies ◽  
Row Spacing ◽  
Herbicide Application ◽  
Poor Control ◽  
Application Timing ◽  
Common Lambsquarters ◽  
No Till ◽  
Giant Foxtail ◽  
Herbicide Treatments

Field studies were conducted to evaluate the influence of herbicide application timing on weed control in no-till soybean production. Row spacing generally had no effect on weed control. Herbicide treatments containing chlorimuron plus metribuzin applied as many as 45 days prior to planting in 1988 and 1989 controlled broadleaf weeds throughout the growing season. Imazaquin applied 45 and 30 days prior to planting provided poor control of common cocklebur in 1989. Giant foxtail control was inconsistent with all herbicide treatments. Soybean yields subsequent to early preplant herbicide applications were greater than or equal to those in which applications were made at planting when late-season weed control was adequate. Herbicides applied preemergence did not control high densities of common lambsquarters in 1989.

Weed seed return as influenced by the critical weed-free period and row spacing of no-till glyphosate-resistant soybean

2001 ◽  
Vol 81 (4) ◽  
pp. 877-880 ◽  
Author(s):  
Kevin Chandler, Anil Shrestha, and Swanton
Keyword(s):  
Weed Control ◽  
Weed Management ◽  
Soil Surface ◽  
Integrated Weed Management ◽  
Row Spacing ◽  
Critical Periods ◽  
Weed Seed ◽  
No Till ◽  
Weed Population Dynamics ◽  
Glycine Max L

Seed return from later-emerging weeds is a concern in soybean management systems based on critical periods for weed control. This study in Ontario estimated the weed seed return to the soil surface as influenced by the duration of weed control in soybean and soybean row spacing. Weeds emerging after the 1- to 2-trifoliate stage of soybean development did not increase the weed seedbank population compared to the residual population in the weed-free control. Weed seed return was greater in 76 cm than in 38 cm or 19 cm (twin rows) soybean row spacings. Key words: Seedbank, weed population dynamics, integrated weed management, glyphosate-resistant soybean, [Glycine max (L.) Merr].

Cultural Strategies for Managing Weeds and Soil Moisture in Cover Crop Based No-Till Soybean Production

Weed Science ◽  
2014 ◽  
Vol 62 (3) ◽  
pp. 501-511 ◽  
Author(s):  
M. Scott Wells ◽  
S. Chris Reberg-Horton ◽  
Steven B. Mirsky
Keyword(s):  
Soil Moisture ◽  
Weed Control ◽  
Cover Crop ◽  
Water Evaporation ◽  
Row Spacing ◽  
Soybean Yield ◽  
Soybean Production ◽  
Cereal Rye ◽  
No Till ◽  
Free Treatment

A four site-year study was conducted in North Carolina to evaluate the effects of soybean planting timing and row spacing on soil moisture, weed density, soybean lodging, and yield in a cover crop-based no-till organic soybean production system. Soybean planting timing included roll-kill/planting and roll-kill/delayed planting where soybean planting occurred either on the same day or approximately 2 wk later, respectively. Soybean row spacing included 19, 38, and 76 cm, and all treatments included a weedy check and weed-free treatment. Rye biomass production averaged above 10,000 kg ha−1dry matter, which resulted in good weed control across all sites. Despite having good weed control throughout all treatments, weed coverage was highest in the 76-cm row-space treatment when compared to both the 19-cm and 38-cm row spacing in two of the four site-years. Soybean lodging is a potential consequence of no-till planting of soybeans in high residue mulches, and of the three row spacings, the 19-cm spacing exhibited the greatest incidence of lodging. Row spacing also influenced soybean yield; the 19- and 38-cm row spacing out yielded the 76-cm spacing by 10%. Soil volumetric water content (VWC) was higher in the cereal rye mulch treatments compared to the no rye checks. Furthermore, delaying soybean planting lowered soil water evaporation. However, the increased soil VWC in the rolled-rye treatment did not translate into increased soybean yield. The rolled-rye treatment exhibited significant (P < 0.01) increases in soil VWC when compared to the no-rye treatment at three of the four site-years. These results highlight planting date flexibility and potential risk to lodging that producers face when no-till planting organic soybeans.

Weed Control in Barley (Hordeum vulgare) – No-Till Grain Sorghum (Sorghum bicolor) Production

Weed Science ◽  
1990 ◽  
Vol 38 (1) ◽  
pp. 50-53
Author(s):  
Moussa M. Diawara ◽  
Philip A. Banks
Keyword(s):  
Control Systems ◽  
Weed Control ◽  
Field Research ◽  
Grain Sorghum ◽  
Barley Grain ◽  
Winter Barley ◽  
No Till ◽  
Herbicide Treatments ◽  
Seed Yields ◽  
Barley Crop

Field research to determine the influence of weed control systems in winter barley on subsequently no-till-planted grain sorghum was conducted from 1985 to 1987 in northwest Georgia. Herbicide treatments applied to fully tillered winter barley included 2,4-D, dicamba, metribuzin, oryzalin, oryzalin plus metribuzin, fluorochloridone, or thiameturon. None of these herbicides affected barley grain yields compared to nontreated plots. Treatments containing oryzalin reduced johnsongrass fresh weights in the subsequently planted grain sorghum. Oryzalin plus metribuzin, in 1 of 2 yr, resulted in higher seed yields of subsequently planted grain sorghum compared to the other treatments except for oryzalin used alone. Treatments containing paraquat plus propazine plus metolachlor applied to grain sorghum provided good weed control when averaged across barley treatments and resulted in the highest grain sorghum yield. No grain sorghum injury from herbicides used in the previous winter barley crop was observed.

Long-Term Effects of No-tillage in a Winter Wheat (Triticum aestivum)-Sorghum (Sorghum bicolor)-Fallow Rotation

Weed Science ◽  
1988 ◽  
Vol 36 (3) ◽  
pp. 384-393 ◽  
Author(s):  
Gail A. Wicks ◽  
Darryl E. Smika ◽  
Gary W. Hergert
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Sorghum Bicolor ◽  
Weed Control ◽  
Control Method ◽  
Organic Matter Content ◽  
Soil Surface ◽  
Soil Mixing ◽  
No Till ◽  
Over Time

This research was conducted near North Platte, NE, over an 18-yr period to determine the feasibility of using herbicides to replace tillage as the weed control method in a winter wheat (Triticum aestivumL.)-sorghum [Sorghum bicolor(L.) Moench.]-fallow rotation. Five tillage treatments [two tillage and three reduced or no-till treatments] were used on the same plots during the duration of this experiment on a Holdrege silt loam (Typic Argiustolls). Herbicides effectively replaced tillage for weed control. The no-till plots treated with atrazine [6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamine] after wheat harvest had higher sorghum and winter wheat yields, higher crop residue remaining on the soil surface, and lower weed yields than tilled plots. The most difficult weeds to control were volunteer wheat and barnyardgrass [Echinochloa crus-galli(L.) Beauv. # ECHCG]. Soil surface pH decreased over time because of increased use of nitrogen. The pH in nontilled plots was significantly lower than in tilled plots due to lack of soil mixing. Exchangeable calcium was the predominant cation leached from the top 5 cm but showed accumulation between the 5- to 12.5-cm depth. Organic matter content showed little change over time.

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