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Full-Text Articles in Life Sciences

Understanding Engineering Students' Perceptions And Knowledge About Sustainable Development And Sustainability, Bhavna Sharma, Brian L. Steward, Say K. Ong, Fernando E. Miguez Oct 2014

Understanding Engineering Students' Perceptions And Knowledge About Sustainable Development And Sustainability, Bhavna Sharma, Brian L. Steward, Say K. Ong, Fernando E. Miguez

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

The Sustainable Engineering and International Development course was first offered to engineering majors at the Iowa State University (ISU) in 2005. The course is focused on describing, discussing and comparing the key concepts of sustainability, sustainable development and sustainable engineering. In 2005, sustainability was not a major part of the engineering curricula and students had little to no knowledge about these concepts. Nine years later, sustainability has become an integral part of our daily lives. In this study, we wanted to understand student perceptions, knowledge, and understanding of sustainability, sustainable development and its implementation across various engineering systems. The assessment ...


Spring Tillage Pitfalls, Mahdi Al-Kaisi Mar 2014

Spring Tillage Pitfalls, Mahdi Al-Kaisi

Integrated Crop Management News

Generally, springtime is not an ideal time for conducting tillage because of potential negative soil and agronomic outcomes associated with tillage in wet conditions. These soil and agronomic problems are linked together in affecting yield. Here are some of the reasons to avoid spring tillage.


Crop Availability Of Phosphorus In Beef Manure, Antonio P. Mallarino, Mazhar Ul Haq, Nicolas Dagna Jan 2014

Crop Availability Of Phosphorus In Beef Manure, Antonio P. Mallarino, Mazhar Ul Haq, Nicolas Dagna

Leopold Center Completed Grant Reports

This study provided the first Iowa assessment of the availability of beef cattle manure phosphorus (P) for crops since the early 1970s.


Landowner Resources For Sustainable Farm Leasing, Drake Agricultural Law Center Jan 2014

Landowner Resources For Sustainable Farm Leasing, Drake Agricultural Law Center

Leopold Center Publications and Papers

This trifold brochure explains the Sustainable Agricultural Land Tenure (SALT) Initiative, a collaboration of the Drake Agricultural Law Center and the Leopold Center. A number of resources have been created as part of this initiative including The Landowner's Guide to Sustainable Farm Leasing, The Landowner's Decision Tool, videos, podcasts, sample leases and other organizations.


Comparison Of Biofuel Systems (Cobs) Project: Biomass Energy Conversion And Energy Return On Investment Analyses For 2012 Growing Season, Fernando E. Miguez, Virginia Nichols Jan 2014

Comparison Of Biofuel Systems (Cobs) Project: Biomass Energy Conversion And Energy Return On Investment Analyses For 2012 Growing Season, Fernando E. Miguez, Virginia Nichols

Leopold Center Completed Grant Reports

From 2009-2012 the COBS team used a standard method to estimate carbohydrates in the biomass harvested from the biofuel systems in order to determine the cellulosic yields. This project performed the same analysis for 2012 harvested biomass, and further analyzed biomass from 2009-2012 using a method that is less commonly used due to its expense, but is much more accurate.


Above- And Below-Ground Biomass Production In Corn And Prairie Bioenergy Cropping Systems, Matthew Z. Liebman, Meghann Elizabeth Jarchow, Ranae N. Dietzel, David N. Sundberg Jan 2014

Above- And Below-Ground Biomass Production In Corn And Prairie Bioenergy Cropping Systems, Matthew Z. Liebman, Meghann Elizabeth Jarchow, Ranae N. Dietzel, David N. Sundberg

Iowa State Research Farm Progress Reports

The Comparison of Biofuel Systems (COBS) project is a long-term, 20-acre field experiment designed to provide quantitative, side-by-side comparisons of corn- and prairie-based biofuel feedstock production systems with respect to biomass yields, liquid fuel potential, and multiple environmental impacts. Here, we report on above- and below-ground biomass production from selected treatments.


Seasonal And Rotational Influences On Corn Nitrogen Requirements, John E. Sawyer, Daniel W. Barker Jan 2014

Seasonal And Rotational Influences On Corn Nitrogen Requirements, John E. Sawyer, Daniel W. Barker

Iowa State Research Farm Progress Reports

This project was designed to study the N fertilization needs in continuous corn (CC) and corn rotated with soybean (SC) as influenced by location and climate. Multiple rates of fertilizer N are spring applied, with the intent to measure yield response to N within each rotation on a yearly basis for multiple years at multiple sites across Iowa. This will allow determination of N requirements for each rotation, differences that exist between the two rotations, responses to applied N across different soils and climatic conditions, and evaluation of tools used to adjust N application.


Long-Term Tillage And Crop Rotation Effects On Soil Carbon And Soil Productivity, Mahdi Al-Kaisi, Mahdi Al-Kaisi, David Kwaw-Mensah Jan 2014

Long-Term Tillage And Crop Rotation Effects On Soil Carbon And Soil Productivity, Mahdi Al-Kaisi, Mahdi Al-Kaisi, David Kwaw-Mensah

Iowa State Research Farm Progress Reports

Tillage systems and crop rotation have major long-term effects on soil productivity and the quality components of soil carbon and soil biological, physical, and chemical properties. Additionally, both soil tillage and crop rotation controls weed- and soil-borne diseases. There is a need for a well-defined, long-term tillage and crop rotation study across the different soil types and climate conditions in the state. The objective of this study was to evaluate the long-term effects of different tillage systems and crop rotations on soil productivity and soil quality.


Impact Of Liquid Swine Manure Application And Cover Crops On Groundwater Quality, Carl H. Pederson, Matthew J. Helmers, Rameshwar S. Kanwar, Antonio P. Mallarino Jan 2014

Impact Of Liquid Swine Manure Application And Cover Crops On Groundwater Quality, Carl H. Pederson, Matthew J. Helmers, Rameshwar S. Kanwar, Antonio P. Mallarino

Iowa State Research Farm Progress Reports

The primary objective of this project was to determine the impact of appropriate rates of swine manure applications to corn and soybeans based on nitrogen and phosphorus requirements of crops, soil phosphorus accumulation, and the potential of nitrate and phosphorus leaching to groundwater. Another purpose of this long-term experimental study was to develop and recommend appropriate manure and nutrient management practices to producers to minimize water contamination potential and enhance the use of swine manure as fertilizer. A third component of this study was to determine the potential effects of rye as a cover crop to reduce nitrate loss to ...


Nutrient Removal By Prairie Filter Strips In Agricultural Landscapes, Xiaobo Zhou, Matthew J. Helmers, Heidi Asbjornsen, Randall K. Kolka, Mark D. Tomer, Richard M. Cruse Jan 2014

Nutrient Removal By Prairie Filter Strips In Agricultural Landscapes, Xiaobo Zhou, Matthew J. Helmers, Heidi Asbjornsen, Randall K. Kolka, Mark D. Tomer, Richard M. Cruse

Agricultural and Biosystems Engineering Publications

Nitrogen (N) and phosphorus (P) from agricultural landscapes have been identified as primary sources of excess nutrients in aquatic systems. The main objective of this study was to evaluate the effectiveness of prairie filter strips (PFS) in removing nutrients from cropland runoff in 12 small watersheds in central Iowa. Four treatments with PFS of different spatial coverage and distribution (No-PFS, 10% PFS, 10% PFS with strips, and 20% PFS with strips) were arranged in a balanced incomplete block design across four blocks in 2007. A no-tillage two-year corn (Zea mays L.) –soybean (Glycine max [L.] Merr.) rotation was grown in ...