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Full-Text Articles in Life Sciences
An Affinity–Effect Relationship For Microbial Communities In Plant–Soil Feedback Loops, Yi Lou, Sharon A. Clay, Adam S. Davis, Anita Dille, Joel Felix, Analiza H. M. Ramirez, Christy L. Sparague, Anthony C. Yannarell
An Affinity–Effect Relationship For Microbial Communities In Plant–Soil Feedback Loops, Yi Lou, Sharon A. Clay, Adam S. Davis, Anita Dille, Joel Felix, Analiza H. M. Ramirez, Christy L. Sparague, Anthony C. Yannarell
Agronomy, Horticulture and Plant Science Faculty Publications
Feedback loops involving soil microorganisms can regulate plant populations. Here, we hypothesize that microorganisms are most likely to play a role in plant–soil feedback loops when they possess an affinity for a particular plant and the capacity to consistently affect the growth of that plant for good or ill. We characterized microbial communities using whole-community DNA fingerprinting from multiple "home-and-away" experiments involving giant ragweed (Ambrosia trifida L.) and common sunflower (Helianthus annuus L.), and we looked for affinity–effect relationships in these microbial communities. Using canonical ordination and partial least squares regression, we developed indices expressing each microorganism's affinity …
Pre-Plant Anhydrous Ammonia Placement Consequences On No-Till Versus Conventional-Till Maize Growth And Nitrogen Responses, Peter Kovacs, George E. Van Scoyoc, Thomas A. Doerge, James J. Camberato, Tony J. Vyn
Pre-Plant Anhydrous Ammonia Placement Consequences On No-Till Versus Conventional-Till Maize Growth And Nitrogen Responses, Peter Kovacs, George E. Van Scoyoc, Thomas A. Doerge, James J. Camberato, Tony J. Vyn
Agronomy, Horticulture and Plant Science Faculty Publications
With the advent of precision guidance systems, maize (Zea mays L.) farmers in various tillage systems have more options in pre-plant nutrient banding relative to the intended crop rows. Anhydrous ammonia (NH3) placement during pre-plant application is of interest because of concerns for possible ammonia toxicity to maize seedlings when high NH3 rates are applied too close to the seed row and the need to improve plant-nitrogen (N) use efficiencies. Field studies were conducted between 2010 and 2012 near West Lafayette, IN, to compare traditional angled (diagonally) vs. precision-guided parallel NH3 applications (the latter was offset 15 cm from …
Common Sunflower Seedling Emergence Across The U.S. Midwest, Sharon A. Clay, Adam Davis, Anita Dille, John Lindquist, Analiza H. M. Ramirez, Christy Sprague, Graig Reicks, Frank Forcella
Common Sunflower Seedling Emergence Across The U.S. Midwest, Sharon A. Clay, Adam Davis, Anita Dille, John Lindquist, Analiza H. M. Ramirez, Christy Sprague, Graig Reicks, Frank Forcella
Agronomy, Horticulture and Plant Science Faculty Publications
Predictions of weed emergence can be used by practitioners to schedule POST weed management operations. Common sunflower seed from Kansas was used at six Midwestern U.S. sites to examine the variability that 16 climates had on common sunflower emergence. Nonlinear mixed effects models, using a flexible sigmoidal Weibull function that included thermal time, hydrothermal time, and a modified hydrothermal time (with accumulation starting from January 1 of each year), were developed to describe the emergence data. An iterative method was used to select an optimal base temperature (Tb) and base and ceiling soil matric potentials (ψb and ψc) that resulted …
Does The Conversion Of Grasslands To Row Crop Production In Semi-Aridareas Threaten Global Food Supplies, David E. Clay, Sharon A. Clay, Kurtis D. Reitsma, Barry H. Dunn, Alexander J. Smart, Gregg G. Carlson, David Horvath, James J. Stone
Does The Conversion Of Grasslands To Row Crop Production In Semi-Aridareas Threaten Global Food Supplies, David E. Clay, Sharon A. Clay, Kurtis D. Reitsma, Barry H. Dunn, Alexander J. Smart, Gregg G. Carlson, David Horvath, James J. Stone
Agronomy, Horticulture and Plant Science Faculty Publications
In the world's semi-arid regions, high crop demands have produced short term economic incentives to convert food production on native grasslands to dryland row crop food production, while genetic enhancements and equipment have reduced the risk of crop failure. The objectives of this paper were to discuss (1) the importance of considering the long-term sustainability of changing land use in semi-arid regions; (2) the impact of extreme climatic events on ecosystem functioning; and (3) factors contributing to higher crop yields in semi-arid regions. Semi-arid regions contain fragile areas where extreme climate events may be a tipping point that converts an …
Identification Of Differential Agronomic Traits In Early Stage Teosinte, Flint, Dent, And Sugar (Sweet) Corn Varieties In Competition With Weeds, S.A. Hansen, S. A. Clay, David Horvath, S. Flint-Garcia
Identification Of Differential Agronomic Traits In Early Stage Teosinte, Flint, Dent, And Sugar (Sweet) Corn Varieties In Competition With Weeds, S.A. Hansen, S. A. Clay, David Horvath, S. Flint-Garcia
Agronomy, Horticulture and Plant Science Faculty Publications
Weed competition reduces corn yield. Today’s corn monoculture relies heavily on herbicide inputs to maintain yield. However, teosinte, corn’s ancestor, was successfully grown in mixed production systems. Harnessing genes and traits that allow teosinte to be a better competitor but which may have been lost during corn domestication could help producers reduce herbicide inputs and maintain yield. The first step to finding those genes is to identify varieties of corn and lines of teosinte that have a higher tolerance of weeds or greater weed suppressive ability. Five introductions of teosinte and 14 varieties of corn (including dent, heritage, and sweet …