Fungicide Application Timing and Row Spacing Effect on Soybean Canopy Penetration and Grain Yield

Hanna, Shane O.; Conley, Shawn P.; Shaner, Gregory; Santini, Judith B.

doi:10.2134/agronj2007.0135

Cited by 47 publications

(39 citation statements)

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“…Th e results indicate that soybean has the greatest yield potential in 0.19 m rows at seeding rates of 420,000 seeds ha −1 in this study. In addition to crop growth and yield potential, however, equipment costs (De Bruin and Pedersen, 2008a), prevalence of Sclerotinia stem rot (Sclerotinia sclerotiorum) or white mold (Grau and Radke, 1984), wheeltrack damage from postemergence pesticide applications (Hanna et al, 2008), and weed competitiveness at diff erent row spacing (Norsworthy and Frederick, 2002) also infl uence optimum soybean row spacing in a particular environment. Furthermore, optimum economic seeding rates are oft en less than seeding rates that result in maximum yield because of the high costs of soybean seed (Lee et al, 2008;De Bruin and Pedersen, 2008b).…”

Section: Discussionmentioning

confidence: 99%

“…In a 4-yr study in southern Wisconsin (Pedersen and Lauer, 2003), average yields did not diff er among the three row spacings, but an interaction with years was observed with soybean in 0.19 m rows yielding greater in 2 yr and soybean in 0.38 m rows yielding greater in 1 yr. Janovicek et al (2006) reported soybean in 0.19 m rows yielded 13% more compared with 0.76 m rows under moldboard plow and no-tillage systems, but yielded only 4% more under moldboard plow and the same under no-till compared with 0.38 m rows in a 3-yr study at three locations in Ontario, Canada. In an Indiana study at three locations (Hanna et al, 2008), soybean in 0.19 vs. 0.38 m rows yielded 9% more in the absence of wheel-track damage associated with postemergence pesticide applications, but yielded the same in the presence of wheel-track damage. Results from the more recent studies in northern latitudes indicate no consistent yield advantage for drilled soybean in 0.19 m rows compared to 0.38 m rows.…”

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Growth and Yield Responses of Soybean to Row Spacing and Seeding Rate

2011

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or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Split-row planters compared to grain drills may allow for reduced soybean seeding rates and seed costs because row crop planters result in more uniform seed depth and distance between seeds in a row, improving emergence and uniformity of fi nal stands (Bertram and Pedersen, 2004). Some studies (Weber et al., 1966;Oplinger and Philbrook, 1992) in northern latitudes, however, have reported row spacing by seeding rate interactions with soybean responding more positively to higher seeding rates in narrow vs. wide rows. Other studies in Ohio (Beurelein, 1988) and Ontario, Canada (Ablett et al., 1991) reported no row spacing by seeding rate interactions with across seeding rates. Nevertheless, yield showed a quadratic response to seeding rate (3.04, 3.25, and 3.12 Mg ha −1 at 321,000; 420,000; and 469,000 seeds ha −1 , respectively) with no row spacing interaction. Soybean compensated more at lower seeding rates than at wider rows, but fi eld-scale studies are being conducted to evaluate the economics of both practices.

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Section: Discussionmentioning

confidence: 99%

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Growth and Yield Responses of Soybean to Row Spacing and Seeding Rate

2011

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“…P. pachyrhizi is an invasive fungal disease that can signiÞcantly reduce soybean yield (Kawuki et al 2003, Miles et al 2003. In the absence of P. pachyrhizi, inconsistent but positive yield responses are possible with the application of fungicide (Hanna et al 2008) through control of various (or multiple) fungal pathogens present in North America soybean (Dashiell and Akem 1991). As a result, growers are increasingly exposed to marketing promotions that advise the application of tankmixed pesticides (fungicides and insecticides) based on a calendar date or plant growth stage.…”

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Probability of Cost-Effective Management of Soybean Aphid (Hemiptera: Aphididae) in North America

Johnson

O’Neal

Ragsdale

et al. 2009

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Soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is one of the most damaging pests of soybean, Glycine max (L.) Merrill, in the midwestern United States and Canada. We compared three soybean aphid management techniques in three midwestern states (Iowa, Michigan, and Minnesota) for a 3-yr period (2005)(2006)(2007). Management techniques included an untreated control, an insecticidal seed treatment, an insecticide fungicide tank-mix applied at flowering (i.e., a prophylactic treatment), and an integrated pest management (IPM) treatment (i.e., an insecticide applied based on a weekly scouting and an economic threshold). In 2005 and 2007, multiple locations experienced aphid population levels that exceeded the economic threshold, resulting in the application of the IPM treatment. Regardless of the timing of the application, all insecticide treatments reduced aphid populations compared with the untreated, and all treatments protected yield as compared with the untreated. Treatment efficacy and cost data were combined to compute the probability of a positive economic return. The IPM treatment had the highest probability of cost effectiveness, compared with the prophylactic tank-mix of fungicide and insecticide. The probability of surpassing the gain threshold was highest in the IPM treatment, regardless of the scouting cost assigned to the treatment (ranging from $0.00 to $19.76/ha). Our study further confirms that a single insecticide application can enhance the profitability of soybean production at risk of a soybean aphid outbreak if used within an IPM based system. Keywords IPM, break-even analysis, gain threshold Disciplines Agriculture | Entomology CommentsThis article is from Journal of Economic Entomology 102 (6) ABSTRACT Soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is one of the most damaging pests of soybean, Glycine max (L.) Merrill, in the midwestern United States and Canada. We compared three soybean aphid management techniques in three midwestern states (Iowa, Michigan, and Minnesota) for a 3-yr period (2005Ð2007). Management techniques included an untreated control, an insecticidal seed treatment, an insecticide fungicide tank-mix applied at ßow-ering (i.e., a prophylactic treatment), and an integrated pest management (IPM) treatment (i.e., an insecticide applied based on a weekly scouting and an economic threshold). In 2005 and 2007, multiple locations experienced aphid population levels that exceeded the economic threshold, resulting in the application of the IPM treatment. Regardless of the timing of the application, all insecticide treatments reduced aphid populations compared with the untreated, and all treatments protected yield as compared with the untreated. Treatment efÞcacy and cost data were combined to compute the probability of a positive economic return. The IPM treatment had the highest probability of cost effectiveness, compared with the prophylactic tank-mix of fungicide and insecticide. The probability of surpassing the gain threshold was highe...

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“…Dentre as práticas de manejo, o arranjo espacial das plantas pode afetar expressivamente a velocidade de fechamento das entre linhas (SHAW; WEBER, 1967;HEIFFIG et al, 2006), a produção de massa seca (COX; CHERNEY, 2011), a arquitetura das plantas (COX; CHERNEY; SHIELDS, 2010), a severidade de doenças (LIMA et al, 2012) e a produtividade de grãos da cultura (BRUIN;PEDERSEN, 2008;HANNA et al, 2008;RAMBO et al, 2003RAMBO et al, , 2004. Isso ocorre porque o arranjo de plantas influencia na competição intraespecífica e, consequentemente, na quantidade de recursos do ambiente -água, luz e nutrientes -disponíveis para cada planta.…”

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Semeadura cruzada em cultivares de soja com tipo de crescimento determinado

et al. 2015

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ResumoAlterações no arranjo espacial de plantas podem aumentar a produtividade de grãos de soja sem aumentos expressivos no custo de produção. A técnica denominada "semeadura cruzada" vem despertando interesse no setor produtivo por ter sido utilizada por alguns recordistas de produtividade de soja no Brasil. O objetivo desse trabalho foi avaliar o desempenho agronômico de cultivares de soja com tipo de crescimento determinado, em diferentes arranjos de plantas. Os experimentos foram conduzidos em Londrina, PR, nas safras 2011/12 e 2012/13, sob o delineamento de blocos completos ao acaso, em esquema fatorial 2x2x2, com três repetições. Os tratamentos foram formados pela combinação de dois espaçamentos entre fileiras (0,4 e 0,6 m), duas densidades de semeadura (375.000 e 562.500 sementes ha -1 ) e de dois sistemas de semeadura (semeadura cruzada e não cruzada). Na safra 2010/11, utilizou-se a cultivar BRS 294 RR e na safra 2011/12 a cultivar BRS 295 RR. Nas duas safras, a produtividade de grãos não foi influenciada pelo sistema de semeadura, pela densidade de plantas e pela interação entre esses fatores, o que demonstra a alta plasticidade fenotípica das cultivares utilizadas. Para a cultivar BRS 294 RR, o espaçamento de 0,6 m entre fileiras conferiu maior produtividade de grãos em relação ao espaçamento de 0,4 m, principalmente porque proporcionou aumento da produção de grãos oriunda dos ramos. Palavras-chave: Arranjo espacial de plantas, densidade de plantas, espaçamento entre as fileiras, Glycine max AbstractIncreases in the soybean grain yield without significant alterations in the production cost can be achieved with variations in the spatial plant arrangement. The sowing in crossed rows has aroused the interest of Brazilian soybean producers once this practice was used in some areas with record-breaking soybean yield in Brazil. This study aimed to evaluate the agronomic performance of soybean cultivars with determinate growth habit managed under different spatial plant arrangements, including crossed rows. The experiments were carried out in Londrina, PR, at 2011/12 and 2012/13 growing seasons. A randomized complete block experimental design in a 2x2x2 factorial scheme was used, with three replications. The treatments were formed by combining two row spacing (0.4 and 0.6 m), two seeding rates (375,000 and 562,500 seeds ha -1 ) and two sowing systems (crossed or parallel rows).The cultivar BRS 294 RR was used in 2011/12 and BRS 295 RR in 2012/13 growing season. In both cultivars and 1 Eng os Agr os , Drs.,

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Fungicide Application Timing and Row Spacing Effect on Soybean Canopy Penetration and Grain Yield

Abstract: Indicates a least-squares means within a row are different within their location (P ≤ 0.05).* Indicates a least-squares means within a row are different within their location (P ≤ 0.05). † Least-squares means followed by the same letter within a column are not different (P ≤ 0.05).

Cited by 47 publications

References 14 publications

Growth and Yield Responses of Soybean to Row Spacing and Seeding Rate

Growth and Yield Responses of Soybean to Row Spacing and Seeding Rate

Probability of Cost-Effective Management of Soybean Aphid (Hemiptera: Aphididae) in North America

Semeadura cruzada em cultivares de soja com tipo de crescimento determinado

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