Proceedings :: North Central Soil Fertility Conference

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Wortmann, C

Massarik, K

Sheaffer, C.C

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Authors

Yost, M.A

Russelle, M.P

Coulter, J.A

Schmitt, M.A

Sheaffer, C.C

Randall, G.W

Massarik, K

Norman, J

Brye, K

Dobermann, A

Ferguson, R

Hergert, G

Shapiro, C

Tarkalson, D

Walters, D

Wortmann, C

McAfee, B

Wortmann, C

Miller, D

Henry, C

Shapiro, C

Topics

Type

Oral

Year

2014

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2006

2013

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Filter results4 paper(s) found.
1. Stand Age Affects Fertilizer Nitrogen Response in First-Year Corn Following Alfalfa Through a symbiotic relationship with soil bacteria, alfalfa can acquire nitrogen (N) from the atmosphere, use the N for its own growth, and contribute large amounts of N to subsequent crops. To estimate this N contribution, most land-grant universities use book-value N credits based on alfalfa stand density at termination. However, a recent literature analysis indicated that alfalfa stand density is not a reliable predictor of grain yield response to fertilizer N in first-year corn. That analysis... Download paper
2. Long-Term Measurement of Nitrate Leaching Below Corn Agreosystems and a Restored Prairie Many studies have evaluated nitrogen leachmg from tile drained agricultural soils, but less research has been performed on many well drained soils also common throughout the Midwest. This study measured nitrate leaching fiom chisel-plow (CP) and no-tillage 0 agroecosystems in order to determine the effects of common agricultural practices on the quality of water that drains past the root zone of crops. In an effort to obtain background levels of nitrate leaching from a natural ecosystem, measurements... Download paper
3. Should We Abandon Soil Testing and Yield Goals in Estimating Nitrogen Rates for Corn If the prices of corn and fertilizer-N and the shape of the N response function relating crop yield to the amount of fertilizer used are known, calculating an economically optimal N rate (EONR) for maximizing the net return to applied N is straightforward: the EONR is the N rate at which no firher increase in net return occurs. In most cropping systems and under common price scenarios, crop yield at the EONR is within 95 to 99% of the maximum yield obtained for the specific management package. In... Download paper
4. Nitrogen Loss from Sprinkler Applied Beef Feedlot Effluent Loss of nitrogen from sprinkler applied beef feedlot effluent can be costly for both the producer and the environment. Sprinkler application of effluent is common throughout the Great Plains, though little work has focused specifically on N losses from beef feedlot effluent. We quantified ammonia (NH 3) and nitrous oxide (N2O) losses from beef feedlot effluent applications under field conditions including variations in soil pH, soil water content, ammonium (NH 4+) concentration of the effluent, and... Download paper

Filter results4 paper(s) found.

1. Stand Age Affects Fertilizer Nitrogen Response in First-Year Corn Following Alfalfa

Through a symbiotic relationship with soil bacteria, alfalfa can acquire nitrogen (N) from the atmosphere, use the N for its own growth, and contribute large amounts of N to subsequent crops. To estimate this N contribution, most land-grant universities use book-value N credits based on alfalfa stand density at termination. However, a recent literature analysis indicated that alfalfa stand density is not a reliable predictor of grain yield response to fertilizer N in first-year corn. That analysis...

Download paper

2. Long-Term Measurement of Nitrate Leaching Below Corn Agreosystems and a Restored Prairie

Many studies have evaluated nitrogen leachmg from tile drained agricultural soils, but less research has been performed on many well drained soils also common throughout the Midwest. This study measured nitrate leaching fiom chisel-plow (CP) and no-tillage 0 agroecosystems in order to determine the effects of common agricultural practices on the quality of water that drains past the root zone of crops. In an effort to obtain background levels of nitrate leaching from a natural ecosystem, measurements...

Download paper

3. Should We Abandon Soil Testing and Yield Goals in Estimating Nitrogen Rates for Corn

If the prices of corn and fertilizer-N and the shape of the N response function relating crop yield to the amount of fertilizer used are known, calculating an economically optimal N rate (EONR) for maximizing the net return to applied N is straightforward: the EONR is the N rate at which no firher increase in net return occurs. In most cropping systems and under common price scenarios, crop yield at the EONR is within 95 to 99% of the maximum yield obtained for the specific management package. In...

Download paper

4. Nitrogen Loss from Sprinkler Applied Beef Feedlot Effluent

Loss of nitrogen from sprinkler applied beef feedlot effluent can be costly for both the producer and the environment. Sprinkler application of effluent is common throughout the Great Plains, though little work has focused specifically on N losses from beef feedlot effluent. We quantified ammonia (NH 3) and nitrous oxide (N2O) losses from beef feedlot effluent applications under field conditions including variations in soil pH, soil water content, ammonium (NH 4+) concentration of the effluent, and...

Download paper