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Fungicide application timing and row spacing effect on soybean canopy penetration and grain yield. Soybeans have a similar growth habit to bush beans, so there’s no caging or staking required. The extent of this effect will vary by weed species and weed emergence timing relative to the crop (Hock et al., 2006). Minor, H.C., and W.J. While a few studies have shown little to no response of yield to row spacing, no studies to my knowledge have shown a yield increase with wider row spacing. Agron. If you plant corn in 20-inch rows soybeans will be planted in 20-inch rows. Growth and yield responses of soybean to row spacing and seeding rate. In Ohio, most soybeans are planted in row widths ≤ 15 inches. The next consideration is row spacing. 95:965-971. Spacing Space beans about 4-6 inches away from one another with 24 inches between rows. A fact sheet can be downloaded (pdf file) on soybean row spacing. Factors such as equipment costs, workload management, planting and harvest efficiency, and weed and disease control can all influence the economic viability of narrow-row soybeans. For that reason, it is important to consider the effect of row spacing on spray coverage. 54:38-46. Soybeans grown in narrow rows (≤ 15 inches) tend to out-yield soybean produced in wide row width (30 inches) due to increased sunlight interception in … Nonequidistantly spaced plants were 7 cm taller than equidistantly spaced plants in 1988. Another option – owning a second planter specifically for soybeans – allows both crops to be planted at the same time, resulting in earlier completion of soybean planting. 2011. J. ISU Extension and Outreach Soybean response to zone tillage, twin-row planting, and row spacing. Agron. Copyright © 2020 Iowa State University of Science and Technology. Research on soybeans in 15-inch rows is less extensive, having been conducted mostly within the last 10 to 15 years as this row spacing has gained popularity. The earlier-maturing varieties, which tend to be short in stature, yield better at a row spacing of 15 inches or less. 2002. At this point, plant a soybean variety with a relative maturity (RM) rating of 0.5 units shorter than your original soybeans. Harville. 2008. Purdue University research found that spray penetration into the lower canopy was similar among soybeans planted in 7.5, 15, and 30-inch row spacings and that a minimum carrier volume of 15 GPA was more important to maximizing spray coverage (Hanna et al., 2008) than was row spacing. Drilled soybeans, in row spacings of 12 inches or less, account for less than 20% of total acreage. 2011. Planting soybeans is really nothing new, and you can say the whole thing has come full circle. Economic analysis of row spacing for corn and soybean. When those issues are accounted for, narrow-row planting is not necessarily the best economic choice for all operations. In recent years, however, drilled soybeans have fallen out of favor in many areas, likely due to inferior seed placement and singulation capabilities of drills vs. planters, and the cost of planting additional seeds. Several experiments over the years have shown that moisture stress can reduce the yield benefit of narrow rows (DeBruin and Pedersen, 2008). Pearce, and M.R. A dense soybean canopy can enhance these conditions and increase white mold severity. Soybean row spacing and weed emergence time influence weed competitiveness and competitive indices. The increasing width of planters — many are now 60 feet wide — means that splitting rows with additional units makes planters very heavy. Hanna, S.O., S.P. Such scenarios include northern soybean producing regions where the growing season is shorter (Lee, 2006), early soybean production systems where short maturity varieties are planted early to avoid drought (Holshouser and Whittaker, 2002), delayed planting situations (Lee, 2006), and double-crop systems (Minor and Wiebold, 1998; Holshouser et al., 2006). A study conducted in 2008-2009 (Cox and Cherney, 2011) found no row spacing by seeding rate interaction for soybeans planted in 7.5-inch, 15- inch, and 30-inch spacings. J. Row spacing in soybean. Three planting densities were applied (70, 90 and 110 seeds per 1 m 2) with two row spacing (16 and 32 cm), in 4 replications. Agron. 96:462-468. For soybeans planted on droughty … Taylor. With late planting, narrower row spacing is generally recommended. Conditions that may not favor narrow rows. However, there are farmers who still hold on to their 15-inch split planters for planting corn and soybeans. of Missouri-Columbia Extension. Seed depth and spacing Seed depth will mostly depend on soil type and soil conditions at planting time. A factor that has likely played a role in the recent increase in soybeans planted in 30-inch rows in some areas is Sclerotinia stem rot (Sclerotinia sclerotiorum), or white mold. Wet conditions in many areas during the last few planting seasons have exacerbated this situation by creating very short and intermittent planting windows. doi:10.1094/CM-2008-0317-02-RS. Agron. One consistent trend across North America over the last several years has been the move away from drilled soybeans. Butzen, S., and S. Paszkiewicz. For instance, if you live in central Minnesota and originally planted a RM 1.7 variety, by about June 10 switch to an early group I soybean (such as a … 95:564-573. Although 30-inch rows would generally be expected to allow sprayer wheels to pass through without damage, wheel traffic damage may not always be negligible. Cherney. Soybean yield response to plant distribution in Fusarium virguliforme infested soils. Renner, D. Penner, R. Hammerschmidt, and J.D. Because many of these studies used higher seeding rates with narrower row spacings, increased seed costs partially offset the yield benefit associated with narrow rows. Because of this complexity, no one-size-fits-all answer should be applied. In some areas this increase has been substantial. Glyphosate-resistant soybean management system effect on Sclerotinia stem rot. Recommended soybean seeding rates in Minnesota. J. Soybean planting date can have a significant impact on yield. Recent research conducted in Iowa had similar results, indicating that narrow-row systems do not necessarily require a greater harvest stand to maximize yield (Pedersen, 2008). The increasing width of planters means that splitting rows with additional units makes planters very heavy. Research findings on Minnesota soybean seeding rates. 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