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2006

Iowa State University

Agricultural Science

Theses/Dissertations

Crop production and physiology

Articles 1 - 2 of 2

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Management Strategies To Improve Soybean Yield In High Ph Soybean Cyst Nematode Infested Fields , Vladimir Azevedo Da Costa Jan 2006

Management Strategies To Improve Soybean Yield In High Ph Soybean Cyst Nematode Infested Fields , Vladimir Azevedo Da Costa

Retrospective Theses and Dissertations

Soybean cyst nematode (Heterodera glycines; SCN) causes the greatest yield losses of all diseases on soybean [Glycine max (L.) Merr.] in Iowa. Growing SCN-resistant varieties in rotation with non-host crops and SCN-susceptible varieties is the current management recommendation for SCN in Iowa. Previous research has shown that SCN population densities are positively correlated with soil pH. The correlation may reduce the efficacy of the current SCN management recommendation in northern and central Iowa, which is located in the Des Moines lobe area, a calcareous soil area with high pH soil. The hypothesis for this research is that additional management strategies ...


Influence Of Soybean Population On The Efficacy Of Glyphosate , Guillermo D. Arce Reyes Jan 2006

Influence Of Soybean Population On The Efficacy Of Glyphosate , Guillermo D. Arce Reyes

Retrospective Theses and Dissertations

Studies were conducted at three Iowa locations in 2005 and 2006 to test if a reduction in soybean seeding rate would reduce weed suppression and increase glyphosate efficacy. The cultivar H-2162 RR was planted at four seeding rates (240,000, 300,000, 360,000, and 420,000 seed ha-1) for both experiments. In the first experiment, treatments included glyphosate applied at V2, V4, V6, and V2+V6 soybean stage at Boone, Hancock and Story. Weed control efficacy was influenced more by application timing than by soybean seeding rate, while grain yield was influenced more by soybean population than application timing ...