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ABSTRACT Cover crops are an excellent management tool to improve the sustainability of agriculture. Winter rye cover crops have been used successfully in Iowa corn-soybean rotations. Unfortunately, winter rye cover crops occasionally... more
ABSTRACT Cover crops are an excellent management tool to improve the sustainability of agriculture. Winter rye cover crops have been used successfully in Iowa corn-soybean rotations. Unfortunately, winter rye cover crops occasionally reduce yields of the following corn crop. We hypothesize that one potential cause of this corn yield decrease is that glyphosate-killed rye cover crops may be hosts for corn seedling root pathogens and the dying cover crops may pass those pathogens on to the following corn crop. If environmental conditions are favorable for these pathogens to infect corn plants (cold and wet), then these pathogens might decrease yield in some years or fields. To test this idea, we began a series of pot studies in a controlled environment chamber. Preliminary experiments indicate that dying rye cover crop plants may pass on pathogens to germinating corn seedlings and increase infection of seedling roots under cold temperatures. Corn seedlings following a rye cover crop had radicles with visible necrosis and were shorter than radicles of corn that did not follow rye. Corn leaf height and dry weight of plants following rye were also less than the controls. Additionally, roots of corn plants that followed rye had more fungal colonies develop than control plants when they were surface sterilized and places on selective media. Thus, at least in controlled environment pot studies there is evidence of increased seedling root infections following cereal rye.
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that temperature is a key factor controlling soil CO2 flux. Seasonal changes in CO2 flux have been reported Carbon dioxide flux from the soil to the atmosphere is an important to follow seasonal temperature trends (Anderson, 1973;... more
that temperature is a key factor controlling soil CO2 flux. Seasonal changes in CO2 flux have been reported Carbon dioxide flux from the soil to the atmosphere is an important to follow seasonal temperature trends (Anderson, 1973; component of terrestrial C cycling, and accurate estimates of CO2-C
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Research Interests: Earth Sciences, Soil, Environmental Monitoring, Climate, Biological Sciences, and 19 moreEnvironmental Sciences, Nitrogen, Soybean, Management System, Environmental quality, Soybeans, Zea mays, Ecosystem, Nitrous Oxide, Time Factors, Seasons, Rye, Glycine max, System Evaluation, Environment Quality, Polyvinyl Chloride, Cover Crop, Growing Season, and Chisel Plow
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15Nitrate was added to dosing water at 50 mg L -1 and effl uent was collected and analyzed for NO 3 -N, NH 4 -N, and dissolved organic carbon. Mean NO 3 -N concentrations in the effl uent were 0.0, 18.5, 24.2, and 35.3 mg L -1 for the fl... more
15Nitrate was added to dosing water at 50 mg L -1 and effl uent was collected and analyzed for NO 3 -N, NH 4 -N, and dissolved organic carbon. Mean NO 3 -N concentrations in the effl uent were 0.0, 18.5, 24.2, and 35.3 mg L -1 for the fl ow rates 2.9, 6.6, 8.7, and 13.6 cm d-1 ,
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Page 1. The authors are solely responsible for the content of this technical presentation. The technical presentation does not necessarily reflect the official position of ASAE or CSAE, and its printing and distribution does not... more
Page 1. The authors are solely responsible for the content of this technical presentation. The technical presentation does not necessarily reflect the official position of ASAE or CSAE, and its printing and distribution does not constitute ...
Research Interests: Agronomy()
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Research Interests: Agronomy, Growth, Maize, Yield, Field Experiment, and 3 moreGramineae, Conservation Tillage, and Node
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Research Interests: Agronomy()
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Research Interests: GEODERMA()
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Research Interests: Management, Water quality, Modeling, Prediction, Evaluation, and 25 moreAgriculture, Biological Sciences, Simulation, Environmental Sciences, Data, Yield, Crop Production, Soils, Water Table, Agricultural Production, Sol, Soybean, System Simulation, Experimentation, Management Practice, Gramineae, Simulator, Crop Rotation, Winter Wheat, Water Quality, Production System, Simulation Model, Cover Crop, GEODERMA, and Continuo(Agriculture, Biological Sciences, Simulation, Environmental Sciences, Data, Yield, Crop Production, Soils, Water Table, Agricultural Production, Sol, Soybean, System Simulation, Experimentation, Management Practice, Gramineae, Simulator, Crop Rotation, Winter Wheat, Water Quality, Production System, Simulation Model, Cover Crop, GEODERMA, and Continuo)
(Agriculture, Biological Sciences, Simulation, Environmental Sciences, Data, Yield, Crop Production, Soils, Water Table, Agricultural Production, Sol, Soybean, System Simulation, Experimentation, Management Practice, Gramineae, Simulator, Crop Rotation, Winter Wheat, Water Quality, Production System, Simulation Model, Cover Crop, GEODERMA, and Continuo)