Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network

Open Access. Powered by Scholars. Published by Universities.®

PDF

Iowa State University

Plant Sciences

Graduate Theses and Dissertations

Biomass

Articles 1 - 9 of 9

Full-Text Articles in Entire DC Network

Evaluating Temperate And Tropical Corn For Biomass Production In Central Iowa, Pedro Alexander Infante-Posada Jan 2016

Evaluating Temperate And Tropical Corn For Biomass Production In Central Iowa, Pedro Alexander Infante-Posada

Graduate Theses and Dissertations

Corn (Zea mays L.) grain in part has been used in Midwestern U.S. for bioethanol production; however, corn stover for lignocellulosic ethanol is gaining interest as an alternative source of energy. Over two years, three studies explored the biomass potential of tropical corn, corn adapted from tropical regions, for biomass production toward lignocellulosic ethanol. The first study investigated the phenology of adapted and non-adapted tropical corn populations grown under central Iowa conditions. Field trials were conducted where three adapted populations (Tuxpeño, Suwan, and Tuson) and their non-adapted counterparts were planted at three dates during the 2014 and ...


Biomass Sorghum And Maize Have Similar Water-Use-Efficiency Under Non-Drought Conditions In The Rain-Fed, Midwest Us, Matthew Roby Jan 2016

Biomass Sorghum And Maize Have Similar Water-Use-Efficiency Under Non-Drought Conditions In The Rain-Fed, Midwest Us, Matthew Roby

Graduate Theses and Dissertations

Biomass sorghum [Sorghum bicolor (L.) Moench.] is a candidate bioenergy feedstock in the Midwest, US. Research suggests that biomass sorghum is more drought tolerant and has higher water-use-efficiency (WUE; the ratio of cumulative biomass production to total evapotranspiration; g kg-1) than Zea mays (maize) in water-limiting environments. However, comparisons of the seasonal evapotranspiration (total ET) and WUE of biomass sorghum and maize have focused on irrigated systems and are scarce for the rain-fed, Midwest. We conducted a side-by-side comparison of the total ET and WUE of maize and biomass sorghum at a site within the US Corn Belt. Total ET ...


Integration Of Summer And Fall Cover Crops In Vegetable Cropping Systems, Raymond Albert Kruse Jan 2015

Integration Of Summer And Fall Cover Crops In Vegetable Cropping Systems, Raymond Albert Kruse

Graduate Theses and Dissertations

The demand for locally produced vegetables is growing in the Midwest, including Iowa. However, since vegetables are a small fraction of total cropland in the state, little research exists on approaches and techniques to increase the sustainability of vegetable production systems. Including cover crops in vegetable crop rotations can contribute to sustainability in vegetable cropping systems. This research investigated the integration of summer and fall cover crops in vegetable cropping systems to reduce weeds and nutrient leaching, improve soil chemical and biological properties, and enhance crop growth, yield, and produce quality. Cover crops studied in this research included buckwheat (Fagopyrum ...


Performance Evaluation Of Nine Varieties Of Miscanthus In Iowa, Muhammad Aurangzaib Jan 2012

Performance Evaluation Of Nine Varieties Of Miscanthus In Iowa, Muhammad Aurangzaib

Graduate Theses and Dissertations

Miscanthus is a tall perennial grass species native to parts of Asia. It has the potential to produce relatively high dry matter yields across a wide range of environmental and soil conditions. The Miscanthus cultivar most commonly recommended for biofuel production is a sterile hybrid (M. × giganteus) of M. sacchariflorus × M. sinensis , but there are some challenges for its production. One of them is the occurrence of cold damage during the first winter after planting when plant losses can be high. These losses could be exacerbated by incomplete or late senescence. A field trial was established in spring 2010 with ...


Establishment Of Switchgrass In Corn Across A Landscape Gradient: Establishment, Yield, And Quality Of Biomass Feedstock, Theodore P. Gunther Jan 2011

Establishment Of Switchgrass In Corn Across A Landscape Gradient: Establishment, Yield, And Quality Of Biomass Feedstock, Theodore P. Gunther

Graduate Theses and Dissertations

Biofuel production in the United States is expected to offset a significant portion of current fuel use through continued use of corn (Zea mays L.) grain and increasingly from alternative feedstocks. Switchgrass (Panicum virgatum L.) is one such species with potential to be used as an alternative feedstock, but establishment is slow and requires long term commitment of land to reach maximum productivity. Switchgrass can be established while producing a corn crop using 2-4-D and atrazine herbicide and seeding switchgrass prior to corn planting, reducing the risk of producing switchgrass as a crop. Relative performance of both corn and switchgrass ...


Native Warm-Season Grasses: Species, Nitrogen Fertilization, And Harvest Date Effects On Biomass Yield And Composition, Naroon Waramit Jan 2010

Native Warm-Season Grasses: Species, Nitrogen Fertilization, And Harvest Date Effects On Biomass Yield And Composition, Naroon Waramit

Graduate Theses and Dissertations

For traditional forage use, native warm-season grasses are highly productive in the summer months and are suited for a complementary role with cool-season forages in full-season forage systems of the Midwest. For renewable energy sources, these grasses can be used to produce biofuels, an alternative energy source in the future for fossil fuel which is becoming less available. Farmers may integrate forage and biomass cropping for flexibility and diversity in their farming systems. For dual-purpose crops (forage or biomass), the production of warm-season grasses would provide farmers some protection against the market failure of a single purpose. The goals for ...


Comparing Inter-Specific Competition For Continuous Corn Grown In A Living Mulch With Stover Removal, Dustin R. Wiggans Jan 2010

Comparing Inter-Specific Competition For Continuous Corn Grown In A Living Mulch With Stover Removal, Dustin R. Wiggans

Graduate Theses and Dissertations

Chapter 3: Agronomic Response of Living Mulches in Continuous Corn with Stover Removal

A paper to be submitted to Agronomy Journal

Dustin R. Wiggans, Jeremy W. Singer, Kenneth J. Moore, and Kendall R. Lamkey

Corn stover provides producers a potential additional market for selling biomass for biomass production. However, corn stover returns nutrients to the soil, decreases soil erosion, and helps maintain soil properties. Long term stover removal has been determined to cause detrimental environmental effects (Wilhelm et al., 1986; Mann et al., 2002; Nelson, 2002). Perennial groundcovers or living mulches grow simultaneously with the main row crop and are ...


Phosphorus Loss With Surface Runoff As Affected By Bioenergy-Based Residue And Nutrient Managment Systems For An Iowa Loam Soil, Aaron Alan Andrews Jan 2009

Phosphorus Loss With Surface Runoff As Affected By Bioenergy-Based Residue And Nutrient Managment Systems For An Iowa Loam Soil, Aaron Alan Andrews

Graduate Theses and Dissertations

Growing interest in biofuel generation with cellulosic biomass from row crop residues necessitates research to investigate biomass and nutrient management systems impacts water quality. The objective of this research was to evaluate the impact of a range of cropping and corn biomass harvest systems on P loss with surface runoff as affected by N–P management based on inorganic fertilizers or liquid swine manure. A 2–year rainfall simulation study was conducted on established field plots with Clarion loam soil (mixed, superactive, Typic Hapludolls). Eight treatments, each replicated three times, were set up in a completely randomized block design using ...


Investigation Of Management Strategies For The Production Of Sweet Sorghum As A Bioenergy Crop And Preservation Of Crop Residue By The Ensiling Process, Todd Joseph Cogdill Jan 2008

Investigation Of Management Strategies For The Production Of Sweet Sorghum As A Bioenergy Crop And Preservation Of Crop Residue By The Ensiling Process, Todd Joseph Cogdill

Graduate Theses and Dissertations

The objective of this project was to investigate management practices for sweet sorghum as a bioenergy crop in Iowa and its storability as an ensiled product. A management study was conducted to evaluate the effects of planting date, seeding rate, row width, and nitrogen fertility on the growth, biomass yield, and chemical composition of sweet sorghum. In addition, a silage study was conducted to determine chemical composition and fermentation potential of pressed sweet sorghum residue as well as the effects of enzymatic pretreatments.