Weed Control for Soybean (<i>Glycine max</i>) Planted in a Stale or Undisturbed Seedbed on Clay Soil

Heatherly, Larry G.; Elmore, C. Dennis; Wesley, Richard A.

doi:10.1017/s0890037x00034400

Cited by 18 publications

(28 citation statements)

References 26 publications

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“…No visually detectable differences in height occurred among the WTRTs. This is supported by results from studies with similar WTRTs at this location (Heatherly et al, 1992). Lodging ratings were recorded each year, but none exceeded a score of 2 (either all plants leaning slightly or a few plants down).…”

Section: Methodssupporting

confidence: 76%

Row Width and Weed Management Systems for Conventional Soybean Plantings in the Midsouthern USA

2001

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Field studies were conducted from 1994 through 1996 on Sharkey clay (very fine, smectitic, thermic chromic Epiaquert) at Stoneville, MS (33°26′N lat) to determine effect of weed management treatment (WTRT) on yield and net return from Maturity Group V soybean [Glycine max (L.) Merr.] cultivars differing in height and grown in narrow rows (NRs; 50‐cm width) and wide rows (WRs; 100‐cm width) without and with irrigation. The WTRTs were (i) pre‐emergence (PRE) and postemergence (POST) broadleaf weed management; (ii) PRE broadleaf, PRE grass, and POST broadleaf weed management; (iii) POST broadleaf weed management; and (iv) POST broadleaf and POST grass weed management. Herbicides were broadcast‐applied in NRs and band‐applied (0.5‐m‐wide band centered over each row) in WRs. Postemergent cultivation was conducted in WRs. Weed management expense for NRs was greater than that for WRs in most cases. Use of NRs vs. WRs resulted in less weed cover at the end of the growing season, regardless of cultivar or WTRT. Three‐year average seed yield and net return from NRs were greater than those from WRs. Regardless of row width, cultivar, or irrigation environment, highest net returns were obtained from managing only broadleaf weeds either PRE or POST under the conditions at this site.

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Section: Methodssupporting

confidence: 76%

Row Width and Weed Management Systems for Conventional Soybean Plantings in the Midsouthern USA

2001

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“…However, all MP plots required two passes with a field cultivator to smooth, followed by two passes with a cultipacker to firm the seedbed. Thereafter, all plots that were deep‐tilled in the fall were also smoothed in the fall with one pass of either a disk‐harrow or a field cultivator to assure a stale or undisturbed seedbed for early planting the following year (Heatherly and Elmore, 1983; Heatherly et al, 1992).…”

Section: Methodsmentioning

confidence: 99%

Residual Effects of Fall Deep Tillage on Soybean Yields and Net Returns on Tunica Clay Soil

2000

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Seed yield of monocrop soybean [Glycine max (L.) Merr.] grown on nonirrigated clay soils in the Mississippi River alluvial flood plain has been consistently low and marginally profitable. Deep tillage (subsoiling) of certain clayey soils in the fall when the soil profile is dry significantly increases yields and net returns from this production system. Yields and net returns were evaluated for seven deep‐till treatments and a conventional‐till treatment that was disked annually (C). The deep‐till treatments included subsoiling annually and once every second, third, fourth, and fifth year (DT1, DT2, DT3, DT4, and DT5, respectively), Paratill annually (PT1), and profile modification every fifth year (MP). Over the 5‐yr study, DT1 produced the greatest yield (3452 kg ha−1), which was 1016 kg ha−1 (42%) above the average yield from C (2436 kg ha−1). Yields from DT2, DT3, and PT1 were virtually identical and averaged only 198 kg ha−1 (5–6%) less than the average yield from DT1, whereas yields from DT4 and DT5 averaged 291 kg ha−1 (9%) and 613 kg ha−1 (18%) less. Net returns from DT1 ($436 ha−1) averaged the highest, whereas returns from C ($220 ha−1) were the lowest. Net returns from DT2 and DT3 were within 5% of the net returns from DT1, whereas net returns from the DT4, DT5, PT1, and MP treatments respectively averaged 9, 26, 9, and 31% less than returns from DT1. Thus, fall deep tillage should be performed at least once every 3 yr to maximize and sustain higher yields and net returns from soybean grown on nonirrigated Tunica clay (clayey over loamy, smectitic, nonacid, thermic Vertic Haplaquept).

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“…Plots were 23 m long and 4 m (eight rows) wide. All experiments were seeded into a stale, untilled seedbed (Heatherly, 1999c; Heatherly and Elmore, 1983; Heatherly et al, 1992) that had been tilled with a disk‐harrow and/or a spring‐tooth field cultivator in the fall following rice harvest. Glyphosate [ N ‐(phosphonomethyl)glycine] at 0.85 kg a.i.…”

Section: Methodsmentioning

confidence: 99%

Furrow and Flood Irrigation of Early‐Planted, Early‐Maturing Soybean Rotated with Rice

Heatherly

Spurlock

2000

Agronomy Journal

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of grading or land forming remains expensive. A less costly alternative, contour flood irrigation, uses levees The ESPS (Early Soybean Production System) is being adopted installed at the same elevation around and through relain the midsouthern USA to avoid some of the effects of normal lateseason drought. Field studies with soybean [Glycine max (L.) Merr.] tively flat but ungraded fields. This method requires grown following rice (Oryza sativa L.) were conducted in 1994, 1995, little or no grading of relatively flat fields. Straight levee and 1996 at Stoneville, MS, on Sharkey clay (very-fine, smectitic, irrigation uses levees that run perpendicular to the slope thermic Chromic Epiaquert) to compare yield of Maturity Group of a field to confine water to defined areas in fields that (MG) IV and V cultivars grown under furrow vs. flood irrigation, have been graded to slope in only one direction. This and yield and economic performance of nonirrigated (NI) and furrowmethod requires moderate grading to ensure uniform and flood-irrigated MG IV and V cultivars. Three-year average yields field slopes. With either method, the levees separate from irrigated MG IV and V cultivars were significantly greater than field areas of different elevation, and water from rainfall average NI yield. Within each year, yields from MG V cultivars and irrigation flows from the highest to the lowest point equaled or exceeded those from MG IV cultivars in all environments.

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Weed Control for Soybean (Glycine max) Planted in a Stale or Undisturbed Seedbed on Clay Soil

Cited by 18 publications

References 26 publications

Row Width and Weed Management Systems for Conventional Soybean Plantings in the Midsouthern USA

Row Width and Weed Management Systems for Conventional Soybean Plantings in the Midsouthern USA

Residual Effects of Fall Deep Tillage on Soybean Yields and Net Returns on Tunica Clay Soil

Furrow and Flood Irrigation of Early‐Planted, Early‐Maturing Soybean Rotated with Rice

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