Proceedings :: North Central Soil Fertility Conference

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Dobermann, A

Donk, S.V

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Authors

Walters, D.T

Dobermann, A

Cassman, K.G

Drijber, R

Lindquist, J

Specht, J

Yang, H

Yang, H.S

Dobermann, A

Cassman, K.G

Walters, D.T

Dobermann, A

Ferguson, R

Hergert, G

Shapiro, C

Tarkalson, D

Walters, D

Wortmann, C

Shapiro, C

Biswas, S

Kranz, W

Shelton, D

Mamo, M

Mader, T

Snow, D

Donk, S.V

Bartelt-Hunt, S

Zhang, T

Tarkalson, D

Topics

Type

Oral

Year

2004

2005

2006

2013

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Filter results4 paper(s) found.
1. Changes in Nitrogen use Efficiency and Soil Quality After Five Years of Managing for High Yield Corn and Soybean Average corn gain yields in the USA have increased linearly at a rate of 1.7 bulacre over the past 35 years with a national yield average of 130 bdacre. Corn yield contest winners and simulation models, ho ~ever, indicate there is -100 bda in exploitable corn yield gap. Six years (1999-2004) of plant development, grain yield and nutrient uptake \yere compared in intensive irrigated maize systems representing (a) recommended best management practices for a yield goal of 200 bdacre (Ml) and (b) intensive... Download paper
2. Hybrid Maize A Simulation Model for Improving Corn Management Hybrid-Maize (www.hybridmaize.unl.edu) is a computer program that simulates the growth and yield of a corn crop under non-limiting or water-limited (rainfed or irrigated) conditions. The model can be used to (1) assess the overall site yield potential and its variability based on historical weather data, (2) evaluate changes in attainable yield using different combinations of planting date, hybrid maturity and plant density, (3) analyze yield in relation to silking and maturity in a specific year,... 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. Overview of Manure Handling on Steroid Movement in Agricultural Fields from Beef Cattle Systems Manure generated from concentrated animal feeding operations may serve as a source of steroids in surface water and potentially in groundwater. The objectives of this research were to determine the amount of steroids and metabolites in runoff from beef cattle production pens, and from runoff and leaching from crop production fields. Cattle were fed a synthetic progestagen, MGA or melengestrol acetate and treated with zeranol, trenbolone acetate, and estradiol implants, while a second group was not... Download paper

Filter results4 paper(s) found.

1. Changes in Nitrogen use Efficiency and Soil Quality After Five Years of Managing for High Yield Corn and Soybean

Average corn gain yields in the USA have increased linearly at a rate of 1.7 bulacre over the past 35 years with a national yield average of 130 bdacre. Corn yield contest winners and simulation models, ho ~ever, indicate there is -100 bda in exploitable corn yield gap. Six years (1999-2004) of plant development, grain yield and nutrient uptake \yere compared in intensive irrigated maize systems representing (a) recommended best management practices for a yield goal of 200 bdacre (Ml) and (b) intensive...

Download paper

2. Hybrid Maize A Simulation Model for Improving Corn Management

Hybrid-Maize (www.hybridmaize.unl.edu) is a computer program that simulates the growth and yield of a corn crop under non-limiting or water-limited (rainfed or irrigated) conditions. The model can be used to (1) assess the overall site yield potential and its variability based on historical weather data, (2) evaluate changes in attainable yield using different combinations of planting date, hybrid maturity and plant density, (3) analyze yield in relation to silking and maturity in a specific year,...

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. Overview of Manure Handling on Steroid Movement in Agricultural Fields from Beef Cattle Systems

Manure generated from concentrated animal feeding operations may serve as a source of steroids in surface water and potentially in groundwater. The objectives of this research were to determine the amount of steroids and metabolites in runoff from beef cattle production pens, and from runoff and leaching from crop production fields. Cattle were fed a synthetic progestagen, MGA or melengestrol acetate and treated with zeranol, trenbolone acetate, and estradiol implants, while a second group was not...

Download paper