Profit-maximizing seeding rates and replanting thresholds for soybean: Maturity group interactions in the Mid-South

Popp, Michael P.; Edwards, Jeffrey T.; Purcell, Larry C.; Manning, Patrick

doi:10.1016/j.agsy.2006.02.011

Agricultural Systems

2006

DOI: 10.1016/j.agsy.2006.02.011

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Profit-maximizing seeding rates and replanting thresholds for soybean: Maturity group interactions in the Mid-South

Michael P. Popp

Jeffrey T. Edwards

Larry C. Purcell

et al.

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Cited by 15 publications

(17 citation statements)

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“…Soybean production in the Mid‐South has historically relied on full‐season Maturity Group (MG) V and VI cultivars given the day‐length conditions in the region (Popp et al, 2006). However, the pod‐fill period of these MGs inconveniently coincides with the mid‐June through late‐August drought that is common in the region, subsequently limiting yield potential (Heatherly and Hodges, 1998).…”

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confidence: 99%

“…Edwards and Purcell (2005) found that MG VI through MG II cultivars had similar yield potential in the Mississippi Delta region, but earlier maturing cultivars generally required higher plant population density (PPD) to achieve these yields. Subsequent analysis found that an economically optimal plant population density (EOPPD) ranging from 110,000 plants ha −1 for MG IV to 490,000 plants ha −1 for MG II generated similar net returns ranging from US$529 ha −1 for MG IV to US$502 ha −1 for MG III (Popp et al, 2006). The choice among MG and PPD depended on yield potential, seasonal oilseed prices, supplemental irrigation, and seed cost (Popp et al, 2006).…”

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confidence: 99%

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Mid‐South Soybean Yield and Net Return as Affected by Plant Population and Row Spacing

et al. 2015

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Traditionally grown soybean [Glycine max (L.) Merr.] Maturity Groups V and VI are subject to late-season drought in the US Mid-South, resulting in yield reductions when planted in mid-May. Earlier maturing soybean, such as the more recently adapted Maturity Group III cultivars, have generated interest among farmers as a way to avoid the e ects of late-season drought. We investigated economically optimal plant population density for soybean considering seeding rate, row spacing, seed and soybean prices, and weather for Maturity Groups V, IV, and III grown on the rainfed soils in the rolling uplands region of the US Mid-South. ree separate experiments were conducted for Maturity Groups V, IV, and III in 2005 through 2007. Soybean was planted in mid-May in narrow (38-cm) and wide (76-cm) rows at seeding rates of 60 to 593 (´ 10 3 ) seeds ha -1 . ree key implications resulted from this study. First, yield did not respond to plant population density, and an extended yield plateau was found in each maturity group experiment, implying an economic incentive to reduce seed costs to achieve the plant population density at the minimum point on the yield plateau. Second, yield and net-return responses to row spacing were inconsistent and primarily in uenced by weather, but if Maturity Group III soybean were planted, narrow row spacing may provide higher expected yields and net returns. ird, planting Maturity Group III soybean may not overcome the susceptibility of Maturity Groups V and IV soybean to the late-season drought conditions in the rolling uplands region of the Mid-South.

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Mid‐South Soybean Yield and Net Return as Affected by Plant Population and Row Spacing

et al. 2015

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“…Irrigated MG I and II cultivars in 19‐cm rows may achieve yields similar to traditional full‐season cultivars (Edwards and Purcell, 2005), but excessively high population densities are required to attain high yields. The savings in irrigation and labor for MG I and II cultivars usually does not offset the cost of increasing seeding rates (Popp et al, 2006).…”

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confidence: 99%

“…Irrigated MG I and II cultivars in 19-cm rows may achieve yields similar to traditional full-season cultivars , but excessively high population densities are required to attain high yields. The savings in irrigation and labor for MG I and II cultivars usually does not off set the cost of increasing seeding rates (Popp et al, 2006). found that for MG 00 to VI cultivars, yield responded to cumulative intercepted photosynthetically active radiation (CIPAR) in a curvilinear fashion and became asymptotic at high values of CIPAR.…”

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confidence: 99%

Radiation Interception and Yield Response to Increased Leaflet Number in Early‐Maturing Soybean Genotypes

Seversike

Purcell²,

Gbur³

et al. 2009

Crop Science

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Early‐maturing soybean [Glycine max (L.) Merr.] cultivars require less irrigation than full‐season cultivars and may mature before drought periods most often occur in the midsouthern United States. These cultivars require high plant‐population densities for radiation interception and acceptable yields, which increase costs. We hypothesized that seven‐leaflet genotypes would have greater leaf area per plant, resulting in more radiation interception and higher yield than near‐isogenic three‐leaflet genotypes at similar populations. Near‐isogenic lines from maturity groups 00 to 1.8 were seeded at rates from 4 to 80 m−2 The fraction of photosynthetically active radiation (PAR) intercepted by plots was measured using digital imagery and used to estimate cumulative intercepted PAR (CIPAR). Although seven‐leaflet isolines had greater leaf area per leaf than three‐leaflet isolines, leaf area per plant was similar between three‐ and seven‐leaflet isolines because the three‐leaflet isolines had a slightly greater number of main‐stem leaves than seven‐leaflet isolines. Generally, seven‐leaflet isolines had 10 to 21% greater CIPAR at populations ≤40 m−2 compared to three‐leaflet isolines. At populations ≤20 m−2, seven‐leaflet isolines generally had higher yields than three‐leaflet isolines, but yields at these low populations were inherently low and agronomically unacceptable.

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“…This phenological variability is classiÞed using an index of maturity group (MG), where MG 0 represents an early maturing cultivar adapted to northern regions with longer days and a short summer, and MG 8 represents late maturing cultivars adapted to southern regions with shorter days and a long summer. Farmers select a cultivar from a maturity group based on expected yield, date of planting, drought stress, and late season frost (Popp et al 2006). Within a given region, a range of maturity groups is adapted to local growing conditions, e.g., in central Indiana maturity groups with a ranking between 2.5 and 4.0 are suitable for cultivation.…”

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Impact of Developmental Maturity of Soybean on the Seasonal Abundance of Soybean Aphid (Hemiptera: Aphididae)

et al. 2010

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The soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), alternates between a primary overwintering host (buckthorn, Rhamnus sp.) and a secondary summer host (soybean, Glycine max). Selection of soybean cultivars with different maturity groups may provide growers with a management tool for A. glycines, either directly through its effect on summer populations that cause economic damage or indirectly through its effect on the production of migrants that disperse to the primary host in fall. This study investigated the abundance and seasonality of A. glycines on soybean cultivars with different maturity rates in central Indiana. The abscission of soybean foliage occurred earlier for early maturing than late maturing cultivars, but no other consistent difference in development or yield was detected among the cultivars tested in this study. The abundance of aphids did not vary consistently among cultivars when soybean was most susceptible to economic damage. A laboratory assay evaluating the larviposition preference of A. glycines alate females, combined with a 7-yr survey documenting the colonization of buckthorn by winged aphids, indicated that the production of gynoparae on soybean began in mid-September and continued until leaf abscission. The abundance of aphids during this period was higher on late maturing cultivars than on early maturing cultivars in both 2006 and 2008, whereas no significant effect was detected in 2007. Altogether, these results suggest that planting early maturing soybean cultivars has little effect on damage by aphids on the current season crop but may reduce the number of fall migrants to the primary host.

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Profit-maximizing seeding rates and replanting thresholds for soybean: Maturity group interactions in the Mid-South

Cited by 15 publications

References 17 publications

Mid‐South Soybean Yield and Net Return as Affected by Plant Population and Row Spacing

Mid‐South Soybean Yield and Net Return as Affected by Plant Population and Row Spacing

Radiation Interception and Yield Response to Increased Leaflet Number in Early‐Maturing Soybean Genotypes

Impact of Developmental Maturity of Soybean on the Seasonal Abundance of Soybean Aphid (Hemiptera: Aphididae)

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