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Seminar On Adjustment And Its Problems In Southern Iowa, Herbert B. Howell, Russell Swenson, Frank F. Riecken, Lloyd C. Dumenil, Harvey E. Thompson, Orvis P. Engelstad, Donald R. Kaldor, Raymond R. Beneke, Clifford M. Baumback, Clark C. Bloom, John F. Timmons, Clarence D. Edmond, Clarence E. Bundy, Ward W. Bauder, Gordon Ball, Charles Ballantyne, Mary Bodwell, Charles Greenlee, Frank W. Schaller, K. K. Barnes, W. D. Shrader, J. M. Scholl, Andrew L. Mccomb, Walter Woods, Ralph Durham, Earl O. Heady, Loren Ihnen, Charles L. Leven, Lee G. Burchinal, Carl C. Malone, Irene Beavers, Gordon Bivens, Joe M. Bohlen, Charles Donhowe, Eber Eldridge, Emmit Haynes, Arnold Paulsen, Dwayne Rohweder, Joseph A. Stritzel, E. R. Duncan, Wallace Ogg, Louise Rosenfeld, John T. Pesek Jr., Margaret Liston, Virgil L. Hurlburt, Garold Parks, Geoffrey Shepherd, Alvin C. Egbert, Ray E. Wakeley, Francis Carlin, Francis A. Kutish, Verner H. Nielsen, Irwin Oest, J. T. Scott, Morton Smutz, Glenn Holmes, I. W. Arthur, Herbert C. Cook, Donald Boles, Ross Talbot, William Murray, Leon Charity, Howard Johnson, Richard Phillips Aug 2016

Seminar On Adjustment And Its Problems In Southern Iowa, Herbert B. Howell, Russell Swenson, Frank F. Riecken, Lloyd C. Dumenil, Harvey E. Thompson, Orvis P. Engelstad, Donald R. Kaldor, Raymond R. Beneke, Clifford M. Baumback, Clark C. Bloom, John F. Timmons, Clarence D. Edmond, Clarence E. Bundy, Ward W. Bauder, Gordon Ball, Charles Ballantyne, Mary Bodwell, Charles Greenlee, Frank W. Schaller, K. K. Barnes, W. D. Shrader, J. M. Scholl, Andrew L. Mccomb, Walter Woods, Ralph Durham, Earl O. Heady, Loren Ihnen, Charles L. Leven, Lee G. Burchinal, Carl C. Malone, Irene Beavers, Gordon Bivens, Joe M. Bohlen, Charles Donhowe, Eber Eldridge, Emmit Haynes, Arnold Paulsen, Dwayne Rohweder, Joseph A. Stritzel, E. R. Duncan, Wallace Ogg, Louise Rosenfeld, John T. Pesek Jr., Margaret Liston, Virgil L. Hurlburt, Garold Parks, Geoffrey Shepherd, Alvin C. Egbert, Ray E. Wakeley, Francis Carlin, Francis A. Kutish, Verner H. Nielsen, Irwin Oest, J. T. Scott, Morton Smutz, Glenn Holmes, I. W. Arthur, Herbert C. Cook, Donald Boles, Ross Talbot, William Murray, Leon Charity, Howard Johnson, Richard Phillips

Edmond W. H. Lee

This publication includes seminar papers presented and discussed by staff members of Iowa State University during the winter quarter of 1959. The seminar was sponsored by the Center for Agricultural and Economic Adjustment and met for two hours per week over a period of nearly three months. The seminar was organized to include a group of about 70 members designated by the committee listed below. The formal seminar group discus sed each paper after its presentation. The papers were revised in line with these discussions by the seminar group and recommendations by the seminar committee.


Surface Waters: Ammonium Is Not Ammonia – Part 3, John E. Sawyer, Matthew J. Helmers Jul 2016

Surface Waters: Ammonium Is Not Ammonia – Part 3, John E. Sawyer, Matthew J. Helmers

John E. Sawyer

Two previous ICM News articles outlined the difference between ammonium and ammonia, the relationship between the two nitrogen forms, and the implication of a combined (ammonium-N plus ammonia-N) analysis related to water quality criteria for aquatic life and chlorination treatment for drinking water.This article focuses on the potential sourcing of ammonium and ammonia in surface waters. Ammonium and ammonia in surface water systems can originate from many sources, and are naturally occurring forms of nitrogen. Predominant sources will vary on a watershed or sub-watershed basis. Also, sources and concentrations are greatly influenced by hydrology, including timing and volume of ...


N Management Influences On N Losses Through Tile Lines, Gyles W. Randall, John E. Sawyer Jul 2016

N Management Influences On N Losses Through Tile Lines, Gyles W. Randall, John E. Sawyer

John E. Sawyer

Subsurface tile drainage from row-crop agricultural production systems has been identified as a major source of nitrate entering surface waters in the Mississippi River Basin. Tile drainage studies have been conducted on three drainage research facilities at two locations in Minnesota since 1973. Nutrient and crop management systems, including rate and time of nitrogen (N) application, N sources (fertilizer, dairy manure, and hog manure), nitrification inhibitors, cropping systems, and tillage systems have been evaluated to determine their agronomic and environmental characteristics. Results from these studies have been instrumental in the development of best management practices for nutrient management in Minnesota.


Equipment Considerations: Liquid Fertilizer, H. Mark Hanna, John E. Sawyer Jul 2016

Equipment Considerations: Liquid Fertilizer, H. Mark Hanna, John E. Sawyer

John E. Sawyer

A review of application equipment considerations can help ensure that your nitrogen fertilizer is properly applied. This article focuses on liquid fertilizers and is the last in a series of three articles (other two in April 9, 2001, Integrated Crop Management issue) about nitrogen fertilizer application and equipment. A primary consideration for equipment is the relatively high application volumes required. For example, a 150-lb N/acre application of 28 percent UAN solution requires an application of 50 gal/acre.


Equipment Considerations: Anhydrous Ammonia, H. Mark Hanna, John E. Sawyer Jul 2016

Equipment Considerations: Anhydrous Ammonia, H. Mark Hanna, John E. Sawyer

John E. Sawyer

Because of abnormal nitrogen fertilizer production, import, and supply this year and with perhaps a short spring application season, some crop producers may use a form of nitrogen fertilizer with which they are unaccustomed. A review of application equipment considerations can help ensure that your nitrogen fertilizer is properly applied. This article focuses on anhydrous ammonia and is the second in a series of three articles about nitrogen fertilizer application and equipment.


Equipment Considerations: Dry Granual Fertilizer, H. Mark Hanna, John E. Sawyer Jul 2016

Equipment Considerations: Dry Granual Fertilizer, H. Mark Hanna, John E. Sawyer

John E. Sawyer

A review of application equipment considerations can help ensure that your nitrogen fertilizer is properly applied. This article focuses on dry granular fertilizers and is the first in a series of three articles about nitrogen fertilizer application and equipment. Because of varying physical properties of dry fertilizer materials, it is important to consider material distribution across the swath as well as application rate.


Equipment Maintenance: Fertilizer Applicators, H. Mark Hanna, John E. Sawyer, Michael J. Tidman Jul 2016

Equipment Maintenance: Fertilizer Applicators, H. Mark Hanna, John E. Sawyer, Michael J. Tidman

John E. Sawyer

Winter is a good time for crop producers and fertilizer dealers to work out the kinks in fertilizer application equipment for economic, environmental, efficiency, and safety reasons. Properly working application equipment translates into getting the most out of every fertilizer dollar. Overapplying to compensate for poorly calibrated equipment wastes money and could mean nutrient-rich runoff and consequently, a potential water quality problem. This article provides some tips for maintaining your fertilizer application equipment.


Fertilizer And Swine Manure Management Systems: Impacts On Agronomic And Environmental Soil Phosphorus Tests And On Phosphorus Loss With Subsurface Drainage, Antonio P. Mallarino, John E. Sawyer, Jeremy Klatt, Rameshwar S. Kanwar, Carl H. Pederson, James L. Baker, Kenneth T. Pecinovsky Jul 2016

Fertilizer And Swine Manure Management Systems: Impacts On Agronomic And Environmental Soil Phosphorus Tests And On Phosphorus Loss With Subsurface Drainage, Antonio P. Mallarino, John E. Sawyer, Jeremy Klatt, Rameshwar S. Kanwar, Carl H. Pederson, James L. Baker, Kenneth T. Pecinovsky

John E. Sawyer

Manure or fertilizer can be used to supply the phosphorus (P) needs of crops. However, excess P application increases the risk of P loss from fields and of water quality impairment through increased algae growth. Poor water quality in many Iowa lakes has prompted questions about the impact of P management practices on P loss from fields and the effectiveness of using agronomic soil tests for environmental purposes.


Fertilizer And Swine Manure Management Systems: Impacts On Crop Production And Nitrate-Nitrogen Leaching With Subsurface Drainage, Rameshwar S. Kanwar, Carl H. Pederson, James L. Baker, Antonio P. Mallarino, John E. Sawyer, Kenneth T. Pecinovsky Jul 2016

Fertilizer And Swine Manure Management Systems: Impacts On Crop Production And Nitrate-Nitrogen Leaching With Subsurface Drainage, Rameshwar S. Kanwar, Carl H. Pederson, James L. Baker, Antonio P. Mallarino, John E. Sawyer, Kenneth T. Pecinovsky

John E. Sawyer

Nutrient losses from row-crop land can cause nonpoint source water quality problems and “impaired waters.” Nitrogen (N) losses due to nitrate (NO3) leaching cause drinking water problems and possibly increase hypoxia (low oxygen) problems in the Gulf of Mexico. Phosphorus (P) losses can cause eutrophication problems in surface waters (lakes, streams, and reservoirs) in Iowa where algal blooms decrease oxygen, kill fish, and result in murky and bad tasting water. The U.S. EPA and the Iowa Department of Natural Resources are developing nutrient criteria/standards and implementation plans to address TMDL’s (Total Maximum Daily Load) and to improve ...


Farm Energy: Energy Consumption For Row Crop Production, H. Mark Hanna, John E. Sawyer, Dana Petersen Jul 2016

Farm Energy: Energy Consumption For Row Crop Production, H. Mark Hanna, John E. Sawyer, Dana Petersen

John E. Sawyer

This publication provides an overview of farm energy use related to corn and soybean production in Iowa. Three areas of row crop production--field operations, fertilizer and pesticide application, and artificial drying--are used to illustrate on-farm energy consumption.


Farm Energy: Energy Conservation In Corn Nitrogen Fertilization, John E. Sawyer, H. Mark Hanna, Dana Petersen Jul 2016

Farm Energy: Energy Conservation In Corn Nitrogen Fertilization, John E. Sawyer, H. Mark Hanna, Dana Petersen

John E. Sawyer

Optimum corn yields require nitrogen fertilization in most crop rotations, but the energy consumed during the production of nitrogen fertilizer is considerable. Learn more about maximizing economic, environmental, and energy returns for nitrogen and other fertilizers.


Annual Swine Manure Applications To Soybean Under Corn-Soybean Rotation, Allah Bakhsh, Rameshwar S. Kanwar, James L. Baker, John E. Sawyer, Antonio P. Mallarino Jul 2016

Annual Swine Manure Applications To Soybean Under Corn-Soybean Rotation, Allah Bakhsh, Rameshwar S. Kanwar, James L. Baker, John E. Sawyer, Antonio P. Mallarino

John E. Sawyer

The response of a corn-soybean rotation system receiving fall manure application to both corn and soybean is not well understood in terms of its impact on nitrate leaching to subsurface drainage water and crop yields. This field study was conducted from 2001 through 2005 with the key objective of determining the effects of manure application to both corn and soybean on NO3-N concentrations in subsurface drainage water and corn-soybean yields. The study was conducted on 0.4 ha plots instrumented with state-of-the-art subsurface drainage monitoring systems at the Iowa State University research center, Nashua, Iowa. Nitrogen application rates from liquid ...


Application Checkpoints For Fall Ammonia, H. Mark Hanna, John E. Sawyer Jul 2016

Application Checkpoints For Fall Ammonia, H. Mark Hanna, John E. Sawyer

John E. Sawyer

Depending on postharvest field conditions, some producers will soon be considering anhydrous ammonia application. Using fall labor to apply fertilizer can be attractive but needs to be balanced with the potential for nutrient loss. To avoid conversion of anhydrous ammonia from ammonium to more leachable forms of nitrogen, application should be delayed until average soil temperature is below 50°F and trending lower. Measure the 4-inch soil temperature at near 10 a.m. or 7 p.m. or check Iowa State University's county soil temperatures and forecast.


Impact Of Swine Manure Applications On Nitrate And Phosphorus In Subsurface Drainage Water, Rameshwar S. Kanwar, James L. Baker, Carl H. Pederson, Antonio P. Mallarino, John E. Sawyer, Kenneth T. Pecinovsky Jul 2016

Impact Of Swine Manure Applications On Nitrate And Phosphorus In Subsurface Drainage Water, Rameshwar S. Kanwar, James L. Baker, Carl H. Pederson, Antonio P. Mallarino, John E. Sawyer, Kenneth T. Pecinovsky

John E. Sawyer

Nonpoint source nutrient pollution related to land application of manures is recognized as an important environmental and social issue for several reasons. First, manure from swine production facilities can have serious impacts on the quality of ground water resources. Second, several states are in the process of creating laws and/or regulations to reduce nitrogen (N) and phosphorus (P) loadings from manure to soil and water resources. Third, pollution of water resources from nutrients supplied by manure to croplands will help set parameters for developing public policies on the management of manure.


Impact Of Swine Manure Application On Water Quality, Rameshwar S. Kanwar, Carl H. Pederson, Matthew J. Helmers, John E. Sawyer, Antonio P. Mallarino Jul 2016

Impact Of Swine Manure Application On Water Quality, Rameshwar S. Kanwar, Carl H. Pederson, Matthew J. Helmers, John E. Sawyer, Antonio P. Mallarino

John E. Sawyer

Nonpoint source nutrient pollution related to land application of manures is recognized as an important environmental and social issue for several reasons. First,swine manure application to land can impact water quality. Second, several states are in the process of creating laws and/or regulations to reduce nitrogen and phosphorus loadings from manure to soil and water resources. Third, the quality of water resources will help set parameters for developing public policies on management of manure.


Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe Jul 2016

Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe

William Edwards

Four case studies were developed for Iowa farm operations that have successfully used machinery and labor sharing arrangements for intergenerational transfer of farm assets. Results were shared at workshops and through publication of a resource manual.


Ag Decision Maker: Combine Ownership Or Custom Hire, William M. Edwards, H. Mark Hanna Jul 2016

Ag Decision Maker: Combine Ownership Or Custom Hire, William M. Edwards, H. Mark Hanna

William Edwards

Includes advantages and disadvantages of custom hiring and information on estimating costs; includes worksheets.


Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe Jul 2016

Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe

William Edwards

Four case studies were developed for Iowa farm operations that have successfully used machinery and labor sharing arrangements for intergenerational transfer of farm assets. Results were shared at workshops and through publication of a resource manual.


Combine Harvester Econometric Model With Forward Speed Optimization, Nathan E. Isaac, Graeme R. Quick, Stuart J. Birrell, William M. Edwards, Bruce A. Coers Jul 2016

Combine Harvester Econometric Model With Forward Speed Optimization, Nathan E. Isaac, Graeme R. Quick, Stuart J. Birrell, William M. Edwards, Bruce A. Coers

William Edwards

A combine harvester econometric simulation model was developed with the goal of matching the combine forward speed to the maximum harvested net income per acre. The model considers the machinery management costs of owning a combine and platform header for harvesting wheat. A statistical Design of Experiment (DOE) was used to evaluate the model using tri-level variables; the medium values constituted the model base case. Of the 27 input variables, the optimum speed was significantly influenced by the crop area, G/MOG ratio, grain unit price, field yield, field efficiency, grain moisture content, probability of a working day in the ...


Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe Jul 2016

Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe

William Edwards

Four case studies were developed for Iowa farm operations that have successfully used machinery and labor sharing arrangements for intergenerational transfer of farm assets. Results were shared at workshops and through publication of a resource manual.


Ag Decision Maker: Combine Ownership Or Custom Hire, William M. Edwards, H. Mark Hanna Jul 2016

Ag Decision Maker: Combine Ownership Or Custom Hire, William M. Edwards, H. Mark Hanna

William Edwards

Includes advantages and disadvantages of custom hiring and information on estimating costs; includes worksheets.


Combine Harvester Econometric Model With Forward Speed Optimization, Nathan E. Isaac, Graeme R. Quick, Stuart J. Birrell, William M. Edwards, Bruce A. Coers Jul 2016

Combine Harvester Econometric Model With Forward Speed Optimization, Nathan E. Isaac, Graeme R. Quick, Stuart J. Birrell, William M. Edwards, Bruce A. Coers

William Edwards

A combine harvester econometric simulation model was developed with the goal of matching the combine forward speed to the maximum harvested net income per acre. The model considers the machinery management costs of owning a combine and platform header for harvesting wheat. A statistical Design of Experiment (DOE) was used to evaluate the model using tri-level variables; the medium values constituted the model base case. Of the 27 input variables, the optimum speed was significantly influenced by the crop area, G/MOG ratio, grain unit price, field yield, field efficiency, grain moisture content, probability of a working day in the ...


Ag Decision Maker: Combine Ownership Or Custom Hire, William M. Edwards, H. Mark Hanna Jul 2016

Ag Decision Maker: Combine Ownership Or Custom Hire, William M. Edwards, H. Mark Hanna

William Edwards

Includes advantages and disadvantages of custom hiring and information on estimating costs; includes worksheets.


Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe Jul 2016

Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe

William Edwards

Four case studies were developed for Iowa farm operations that have successfully used machinery and labor sharing arrangements for intergenerational transfer of farm assets. Results were shared at workshops and through publication of a resource manual.


Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe Jul 2016

Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe

William Edwards

Four case studies were developed for Iowa farm operations that have successfully used machinery and labor sharing arrangements for intergenerational transfer of farm assets. Results were shared at workshops and through publication of a resource manual.


Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe Jul 2016

Producer Machinery And Labor Sharing Arrangements Workshops, Roger Ginder, William M. Edwards, Georgeanne M. Artz, Darren H. Jarboe

William Edwards

Four case studies were developed for Iowa farm operations that have successfully used machinery and labor sharing arrangements for intergenerational transfer of farm assets. Results were shared at workshops and through publication of a resource manual.


Combine Harvester Econometric Model With Forward Speed Optimization, Nathan E. Isaac, Graeme R. Quick, Stuart J. Birrell, William M. Edwards, Bruce A. Coers Jul 2016

Combine Harvester Econometric Model With Forward Speed Optimization, Nathan E. Isaac, Graeme R. Quick, Stuart J. Birrell, William M. Edwards, Bruce A. Coers

William Edwards

A combine harvester econometric simulation model was developed with the goal of matching the combine forward speed to the maximum harvested net income per acre. The model considers the machinery management costs of owning a combine and platform header for harvesting wheat. A statistical Design of Experiment (DOE) was used to evaluate the model using tri-level variables; the medium values constituted the model base case. Of the 27 input variables, the optimum speed was significantly influenced by the crop area, G/MOG ratio, grain unit price, field yield, field efficiency, grain moisture content, probability of a working day in the ...


Ag Decision Maker: Combine Ownership Or Custom Hire, William M. Edwards, H. Mark Hanna Jul 2016

Ag Decision Maker: Combine Ownership Or Custom Hire, William M. Edwards, H. Mark Hanna

William Edwards

Includes advantages and disadvantages of custom hiring and information on estimating costs; includes worksheets.