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

Digital Commons Network

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

PDF

2006

Iowa State University

Discipline
Keyword
Publication
Publication Type

Articles 31 - 60 of 1869

Full-Text Articles in Entire DC Network

Addressing Fluorogenic Real-Time Qpcr Inhibition Using The Novel Custom Excel File System ‘Focusfield2-6gallupqpcrset-Uptool-001’ To Attain Consistently High Fidelity Qpcr Reactions, Jack M. Gallup, Mark R. Ackermann Dec 2006

Addressing Fluorogenic Real-Time Qpcr Inhibition Using The Novel Custom Excel File System ‘Focusfield2-6gallupqpcrset-Uptool-001’ To Attain Consistently High Fidelity Qpcr Reactions, Jack M. Gallup, Mark R. Ackermann

Veterinary Pathology Publications and Papers

The purpose of this manuscript is to discuss fluorogenic real-time quantitative polymerase chain reaction (qPCR) inhibition and to introduce/define a novel Microsoft Excel-based file system which provides a way to detect and avoid inhibition, and enables investigators to consistently design dynamically-sound, truly LOG-linear qPCR reactions very quickly. The qPCR problems this invention solves are universal to all qPCR reactions, and it performs all necessary qPCR set-up calculations in about 52 seconds (using a pentium 4 processor) for up to seven qPCR targets and seventytwo samples at a time - calculations that commonly take capable investigators days to finish. We have ...


Disaster Recovery—Managing Immature Crops For Grain Or Silage, Stephen K. Barnhart, Roger W. Elmore, Palle Pedersen, H. Mark Hanna Dec 2006

Disaster Recovery—Managing Immature Crops For Grain Or Silage, Stephen K. Barnhart, Roger W. Elmore, Palle Pedersen, H. Mark Hanna

Agriculture and Environment Extension Publications

Tips on managing crops that may not mature before the first killing freeze of fall.


Circadian Rhythms Of Feeding, Oviposition, And Emergence Of The Boll Weevil (Coleoptera: Curculionidae), Shoil M. Greenberg, J. S. Armstrong, Mamoudou Setamou, Thomas W. Sappington, Randy J. Coleman, Tong-Xian Liu Dec 2006

Circadian Rhythms Of Feeding, Oviposition, And Emergence Of The Boll Weevil (Coleoptera: Curculionidae), Shoil M. Greenberg, J. S. Armstrong, Mamoudou Setamou, Thomas W. Sappington, Randy J. Coleman, Tong-Xian Liu

Entomology Publications

Circadian rhythm of feeding, oviposition, and emergence of boll weevil adults were determined at five different photophases (24, 14, 12, 10, and 0 hours) and a constant 27°C temperature, 65% RH in the laboratory. Squares from Petri dishes, where they were exposed to boll weevil females, were removed and examined for feeding and oviposition punctures every 4 hours during daylight (0700–1900 h) and every 12 h at night (1900–0700 h) over eight consecutive days. Cohorts of randomly selected egg-punctured squares were sampled from ovipositing females at 0700, 1100, 1500, and 1900 during 24 hours and under different ...


An Ultrasonic Array Sensor For Spacecraft Leak Direction Finding, Stephen D. Holland, Ronald A. Roberts, Dale E. Chimenti, Junho Song Dec 2006

An Ultrasonic Array Sensor For Spacecraft Leak Direction Finding, Stephen D. Holland, Ronald A. Roberts, Dale E. Chimenti, Junho Song

Aerospace Engineering Publications

We have developed an ultrasonic array sensor useable for locating air leaks in manned spacecraft and have found that this sensor locates leaks in a 1-m2 plate to within 2 cm. The sensor consists of a 63-element multiplexed array plus a reference element, all constructed from a single PZT disc and a printed circuit board. Cross-correlations of signals from the array elements with signals from the single reference element provide a measurement of the leak noise passing through the spacecraft skin under the array. A spatial Fourier transform reveals the dominant direction of propagation. Triangulation from multiple sensor locations ...


Sampling European Corn Borer (Lepidoptera: Crambidae) Larvae From Seed Corn 1 Drying Bins For Bt Resistance Monitoring, Jarrad R. Prasifka, Douglas V. Sumerford, Richard L. Hellmich, Leslie C. Lewis, Dennis D. Calvin Dec 2006

Sampling European Corn Borer (Lepidoptera: Crambidae) Larvae From Seed Corn 1 Drying Bins For Bt Resistance Monitoring, Jarrad R. Prasifka, Douglas V. Sumerford, Richard L. Hellmich, Leslie C. Lewis, Dennis D. Calvin

Entomology Publications

Monitoring for resistance to Bacillus thuringiensis Berliner (Bt) toxins in transgenic crops is challenging, in part because alleles conferring resistance appear to be rare. Consequently, several complementary methods are used to identify, collect and test putatively resistant individuals. A series of experiments conducted at commercial seed production facilities explored an alternative sampling method. Larvae of the European corn borer, Ostrinia nubilalis Hübner, were collected from bins containing Bt hybrid seed corn and their inbred progeny (both F2 and backcross- F2 larvae) were tested for resistance to the Bt toxin Cry1Ab. Marked, laboratory-reared O. nubilalis larvae also were placed beneath drying ...


Impact Of Trap Design, Windbreaks, And Weather On Captures Of European Corn Borer (Lepidoptera: Crambidae) In Pheromone-Baited Traps, Brendon James Reardon, Douglas V. Sumerford, Thomas W. Sappington Dec 2006

Impact Of Trap Design, Windbreaks, And Weather On Captures Of European Corn Borer (Lepidoptera: Crambidae) In Pheromone-Baited Traps, Brendon James Reardon, Douglas V. Sumerford, Thomas W. Sappington

Entomology Publications

Pheromone-baited traps are often used in ecological studies of the European corn borer, Ostrinia nubilalis (Hübner) (Lepidoptera: Crambidae). However, differences in trap captures may be confounded by trap design, trap location relative to a windbreak, and changes in local weather. The objectives of this experiment were, first, to examine differences in O. nubilalis adult (moth) captures among the Intercept wing trap, the Intercept bucket/funnel UNI trap, and the Hartstack wire-mesh, 75-cm-diameter cone trap (large metal cone trap) as well as among three cone trap designs. Second, we examined the influence of the location of the large metal cone trap ...


Measurement Of High-P(T) Single Electrons From Heavy-Flavor Decays In P+P Collisions At Root S=200 Gev, Andrew Adare, Nathan C. Grau, John C. Hill, John G. Lajoie, Alexandre Lebedev, Craig Ogilvie, H. Pei, Marzia Rosati, S. Skutnik, Carla Vale, Et Al., Phenix Collaboration Dec 2006

Measurement Of High-P(T) Single Electrons From Heavy-Flavor Decays In P+P Collisions At Root S=200 Gev, Andrew Adare, Nathan C. Grau, John C. Hill, John G. Lajoie, Alexandre Lebedev, Craig Ogilvie, H. Pei, Marzia Rosati, S. Skutnik, Carla Vale, Et Al., Phenix Collaboration

Physics and Astronomy Publications

The momentum distribution of electrons from decays of heavy flavor (charm and bottom) for midrapidity |y|< 0.35 in p+p collisions at s=200 GeV has been measured by the PHENIX experiment at the BNL Relativistic Heavy Ion Collider over the transverse momentum range 0.3 < p(T)< 9 GeV/c. Two independent methods have been used to determine the heavy-flavor yields, and the results are in good agreement with each other. A fixed-order-plus-next-to-leading-log perturbative QCD calculation agrees with the data within the theoretical and experimental uncertainties, with the data/theory ratio of 1.71 +/- 0.02(stat)+/- 0.18(sys) for 0.3 < p(T)< 9 GeV/c. The total charm production cross section at this energy has also been deduced to be sigma(cc)=567 +/- 57(stat)+/- 193(sys) mu b.


Clear Creek Watershed: 150 Years Of Landscape Change, Andrew P. Rayburn, Lisa A. Schulte-Moore Dec 2006

Clear Creek Watershed: 150 Years Of Landscape Change, Andrew P. Rayburn, Lisa A. Schulte-Moore

Leopold Center Publications and Papers

This fact sheet summarizes the findings of a Leopold Center Ecology Initiative grant (2004-E08) that looked at landscape changes in the Clear Creek watershed in east central Iowa since 1940 using aerial photos and historical records.


Intra-Industry Trade, Multilateral Trade Integration, And Invasive Species Risk, Anh T. Tu, John C. Beghin Dec 2006

Intra-Industry Trade, Multilateral Trade Integration, And Invasive Species Risk, Anh T. Tu, John C. Beghin

CARD Working Papers

We analyze the linkage between protectionism and invasive species (IS) hazard in the context of two-way trade and multilateral trade integration, two major features of real-world agricultural trade. Multilateral integration includes the joint reduction of tariffs and trade costs among trading partners. Multilateral trade integration is more likely to increase damages from IS than predicted by unilateral trade opening under the classic Heckscher-Ohlin-Samuelson (HOS) framework because domestic production (the base susceptible to damages) is likely to increase with expanding export markets. A country integrating its trade with a partner characterized by relatively higher tariff and trade costs is also more ...


Nontariff Barriers, John C. Beghin Dec 2006

Nontariff Barriers, John C. Beghin

CARD Working Papers

Nontariff barriers (NTBs) refer to the wide range of policy interventions other than border tariffs that affect trade of goods, services, and factors of production. Most taxonomies of NTBs include market-specific trade and domestic policies affecting trade in that market. Extended taxonomies include macro-economic policies affecting trade. NTBs have gained importance as tariff levels have been reduced worldwide. Common measures of NTBs include tariff-equivalents of the NTB policy or policies and count and frequency measures of NTBs. These NTB measures are subsequently used in various trade models, including gravity equations, to assess trade and/or welfare effects of the measured ...


Insect-Mediated Seed-Set Evaluation Of 21 Soybean Lines Segregating For Male Sterility At 10 Different Loci, E. Ortiz-Perez, Harry T. Horner, S. J. Hanlin, R. G. Palmer Dec 2006

Insect-Mediated Seed-Set Evaluation Of 21 Soybean Lines Segregating For Male Sterility At 10 Different Loci, E. Ortiz-Perez, Harry T. Horner, S. J. Hanlin, R. G. Palmer

Genetics, Development and Cell Biology Publications

The first requirement to establish a successful hybrid soybean program is the availability of a stable male-sterile, female-fertile system. Male sterility has been an important tool in soybean breeding programs to improve traits such as yield, seed-protein and seed-oil content, and seed size. However, improvement of seed-set per se on male-sterile plants has not been an important breeding objective. The evaluation of the out-crossing potential of the available male-sterile, female-fertile soybean lines is crucial to determine the future of hybrid soybean. The objective of this study was to evaluate seed-set among 21 soybean lines segregating for male sterility at 10 ...


Restoring Perennial Cover And Ecological Function To Corn Belt Landscapes: The Iowa Farmer's Perspective, Ryan C. Atwell, Lisa A. Schulte, Lynne M. Westphal Dec 2006

Restoring Perennial Cover And Ecological Function To Corn Belt Landscapes: The Iowa Farmer's Perspective, Ryan C. Atwell, Lisa A. Schulte, Lynne M. Westphal

Natural Resource Ecology and Management Publications

The tallgrass prairie ecosystem of the North American Corn Belt region has experienced major alteration of hydrologic systems, nearly complete loss of natural perennial vegetation, and concomitant decline in species due to agricultural intensification. In this working landscape, restoration to pre-European settlement conditions is doubtful. However, current research posits that restoring strategically placed patches of perennial cover across agricultural watersheds, such as stream buffers, wetlands and prairies, as well as instituting more diverse cropping rotations, could bolster current ecological function and enhance the conservation of species. These studies also suggest that such restoration might increase socio-economic resilience in the region ...


Counterintuitive Density-Dependent Growth In A Long-Lived Vertebrate After Removal Of Nest Predators, Ricky-John Spencer, Fredric J. Janzen, Michael B. Thompson Dec 2006

Counterintuitive Density-Dependent Growth In A Long-Lived Vertebrate After Removal Of Nest Predators, Ricky-John Spencer, Fredric J. Janzen, Michael B. Thompson

Ecology, Evolution and Organismal Biology Publications

Examining the phenotypic and genetic underpinnings of life-history variation in long-lived organisms is central to the study of life-history evolution. Juvenile growth and survival are often density dependent in reptiles, and theory predicts the evolution of slow growth in response to low resources (resource-limiting hypothesis), such as under densely populated conditions. However, rapid growth is predicted when exceeding some critical body size reduces the risk of mortality (mortality hypothesis). Here we present results of paired, large-scale, five-year field experiments to identify causes of variation in individual growth and survival rates of an Australian turtle (Emydura macquarii) prior to maturity. To ...


Analysis Of Bulked And Redundant Accessions Of Brassica Germplasm Using Assignment Tests Of Microsatellite Markers, Von Mark V. Cruz, John D. Nason, Richard Luhman, Laura F. Marek, Randy C. Shoemaker, E. Charles Brummer, Candice A. C. Gardner Dec 2006

Analysis Of Bulked And Redundant Accessions Of Brassica Germplasm Using Assignment Tests Of Microsatellite Markers, Von Mark V. Cruz, John D. Nason, Richard Luhman, Laura F. Marek, Randy C. Shoemaker, E. Charles Brummer, Candice A. C. Gardner

Ecology, Evolution and Organismal Biology Publications

This study was conducted to determine if Brassica germplasm bulks created and maintained by the USDA-ARS North Central Plant Introduction Station (NCRPIS) were made with genetically indistinguishable component accessions and to examine newly identified putative duplicate accessions to determine if they can be bulked. Using ten microsatellite primer pairs, we genotyped two bulks of B. rapa L. ssp. dichotoma (Roxb.) Hanelt comprising four accessions and three bulks of B. rapa L. ssp. trilocularis (Roxb.) Hanelt comprising fourteen accessions, as well as four pairs of putatively duplicate accessions of B.␣napus L. Assignment tests on ten individual plants per accession were ...


Determining The Extent Of Frost Damage In Maize Seed Using The Tetrazolium Test, Mindy Devries, A. Susana Goggi Dec 2006

Determining The Extent Of Frost Damage In Maize Seed Using The Tetrazolium Test, Mindy Devries, A. Susana Goggi

Agronomy Publications

Frost damage in seed corn causes a significant decrease in seed quality. The tetrazolium (TZ) test has been used to identify types of physiological damage in several plant species, including frost damage in corn. Quantifying the amount of seed damaged by frost and the consequent loss of seed vigor are important for making management decisions. The current tetrazolium test procedures provide seed viability information but do not estimate seed vigor. In our project, the tetrazolium staining procedure was modified to allow separation of viable seeds into vigor categories. Vigor categories were defined based on Association of Official Seed Analysts (AOSA ...


Infrared Spectra And Ab Initio Calculations For The F-−(Ch4)N (N = 1−8) Anion Clusters, Zoë M. Loh, R. L. Wilson, D. A. Wild, Evan J. Bieske, J. M. Lisy, Bosiljka Njegic, Mark S. Gordon Dec 2006

Infrared Spectra And Ab Initio Calculations For The F-−(Ch4)N (N = 1−8) Anion Clusters, Zoë M. Loh, R. L. Wilson, D. A. Wild, Evan J. Bieske, J. M. Lisy, Bosiljka Njegic, Mark S. Gordon

Chemistry Publications

Infrared spectra of mass-selected F-−(CH4)n (n = 1−8) clusters are recorded in the CH stretching region (2500−3100 cm-1). Spectra for the n = 1−3 clusters are interpreted with the aid of ab initio calculations at the MP2/6-311++G(2df 2p) level, which suggest that the CH4ligands bind to F- by equivalent, linear hydrogen bonds. Anharmonic frequencies for CH4 and F-−CH4 are determined using the vibrational self-consistent field method with second-order perturbation theory correction. The n = 1 complex is predicted to have a C3v structure with a single CH group hydrogen bonded to F- ...


Spray Equipment Selection For Best Protection Against Soybean Rust And Aphid, Erdal Ozkan Nov 2006

Spray Equipment Selection For Best Protection Against Soybean Rust And Aphid, Erdal Ozkan

Proceedings of the Integrated Crop Management Conference

Fungicides manufactured to control soybean rust are effective; however, successful control of this disease will mostly depend on proper application methods. Spray coverage and deposition from 9 application equipment/spray nozzles were analyzed. In general, the spray treatments with air assistance were more effective in spraying rust fungicides than the treatments with the conventional boom sprayer. Spray performances from the boom sprayer with a canopy opener were very similar to the air assisted spray treatments, and were better than other treatments with the boom sprayer. Twinjet, Turbo Dual pattern and hollow cone nozzles produced lower spray performances than single-flow pattern ...


Can Ground Eggshells Be Used As A Liming Source?, John Holmes, Paul Kassel Nov 2006

Can Ground Eggshells Be Used As A Liming Source?, John Holmes, Paul Kassel

Proceedings of the Integrated Crop Management Conference

Iowa has become the leading egg producing state in the U.S. It's common to see large-scale egg-laying units in many parts of Iowa. Although most plants ship the eggs intact, some facilities have begun to ship liquid eggs. One egg-breaking operation in northern Iowa produces approximately 15 tons of ground eggshells daily. Several other egg-breaking facilities are also operating in Iowa. The eggshells at most locations are ground, stockpiled, and applied to farm fields. Farmers want to know if the eggshells have any value as a liming source, and if so, at what rate they should be applied.


Sourcing Corn For Ethanol: Effects Of Increased Local Processing, Connie L. Hardy, Howard E. Shepherd, Charles R. Hurburgh Jr., Mary S. Holz-Clause Nov 2006

Sourcing Corn For Ethanol: Effects Of Increased Local Processing, Connie L. Hardy, Howard E. Shepherd, Charles R. Hurburgh Jr., Mary S. Holz-Clause

Proceedings of the Integrated Crop Management Conference

Rapid growth of ethanol production continues to generate many questions related to future analysis, shifts in existing businesses and policy development. In Iowa, new dry-grind ethanol processing plant construction is announced frequently, financed by either local or remote investor groups. New dry-grind ethanol plants are also being added to existing wet milling operations. As these markets develop, there will be innovation in contracts, price discovery and market information. There will also be changes to supplier interaction and service aspects as well. One of the growing concerns is the balance of corn supplies between new ethanol demand and existing feed/export ...


Row Spacing Is Critical For High Yielding Soybeans, Palle Pedersen Nov 2006

Row Spacing Is Critical For High Yielding Soybeans, Palle Pedersen

Proceedings of the Integrated Crop Management Conference

There are fundamental management decisions that give the best opportunity to maintain high yield. Understanding how a soybean plant develops through the season will provide insight into selection of management decisions that should lead to maintaining the soybean genetic yield potential. Row spacing is the third most important variable for maximizing soybean yield after variety selection and planting date. Most research from the Midwest documents that narrows (less than 30 inch) yield greater than wide rows (30 inch or greater). Despite this, the majority of the acres in Iowa are still planted in wide rows. Why7 There are many reasons ...


Production And Use Of Flax And Field Peas In Iowa, Margaret Smith, Mary Wiedenhoeft, Sarah Carlson, Jim Fawcett Nov 2006

Production And Use Of Flax And Field Peas In Iowa, Margaret Smith, Mary Wiedenhoeft, Sarah Carlson, Jim Fawcett

Proceedings of the Integrated Crop Management Conference

Most Iowa crop producers now rely on only two crops, corn and soybeans, for their livelihood. This has led to many challenges, including increased pest problems, such as bean leaf beetles and soybean aphids, a skewed distribution of labor throughout the year, and vulnerability to adverse weather and poor prices. It has also become increasingly difficult to compete in the world market when these commodities can be produced at a lower cost in other countries, such as Brazil. Crop producers are continually looking for a third crop to include in their rotation, but either the economics are not favorable or ...


Brown Stem Rot And Its Interaction With The Soybean Cyst Nematode, G. M. Tabor, G. L. Tylka, C. R. Bronson Nov 2006

Brown Stem Rot And Its Interaction With The Soybean Cyst Nematode, G. M. Tabor, G. L. Tylka, C. R. Bronson

Proceedings of the Integrated Crop Management Conference

Brown stem rot (BSR) of soybeans is caused by the fungal vascular pathogen Cadophora gregata (previously named Phialophora gregata). BSR is an economically important disease of soybeans in the north central United States, being prevalent in 68 to 73% of the soybean fields of Illinois, Iowa, and Minnesota (Workneh et al. 1999). There are two genetic types (called genotypes) of C. gregata that differ in their ability to cause foliar symptoms on susceptible soybeans (Chen et al. 2000). Infection by genotype A of the fungus can result in mild to severe brown discoloration of the pith and severe foliar symptoms ...


Cost-Effective, Performance-Based Environmental Management, John Rodecap, Chad Ingels Nov 2006

Cost-Effective, Performance-Based Environmental Management, John Rodecap, Chad Ingels

Proceedings of the Integrated Crop Management Conference

Iowa has over 19,000 miles of interior rivers and streams, numerous lakes and other natural resources and considerable agricultural production capacity. With such an extensive network of water bodies running through the state it is no surprise that experts have estimated that 90% of Iowa water quality issues are attributed to agricultural land and related activities. This nonpoint source contamination often results from long term actions and will take a long time for measurable outcomes.


Crop Management Practices In Indiana Soybean Production Systems?, Shawn P. Conley, Judith B. Santini Nov 2006

Crop Management Practices In Indiana Soybean Production Systems?, Shawn P. Conley, Judith B. Santini

Proceedings of the Integrated Crop Management Conference

To meet the current and future needs of today's soybean producer it is vital that agricultural researchers and Extension specialists clearly understand the production concerns of our clientele. The objective of this research was to characterize the current management practices of Indiana soybean (Glycine max (L.) Merr.) growers, to identify specific educational needs, and to provide a framework for directing applied soybean research efforts. This assessment was conducted through a direct-mail survey. The results of this survey define distinct similarities and differences among growers of different farm operation size. Large acreage growers (>1000 acres) were more likely to plant ...


Can We Sustain Corn Yield Trends?, Roger Elmore Nov 2006

Can We Sustain Corn Yield Trends?, Roger Elmore

Proceedings of the Integrated Crop Management Conference

Corn yields in Iowa continue at a rate of 2 bushels per acre per year. This is a trend that started back in the 1940's. Driven by hybrid genetic improvement and management the question we need to address is: Are these yield trends sustainable into the future? Will these yield trends continue to increase? If so, for how long7 We can think of yield in four different ways. Yield trends for two of these four are increasing while two are not:


Economic And Environmental Considerations For Drainage Design, Matthew J. Helmers, Ranvir Singh Nov 2006

Economic And Environmental Considerations For Drainage Design, Matthew J. Helmers, Ranvir Singh

Proceedings of the Integrated Crop Management Conference

Water table management through the use of artificial subsurface drainage systems is of primary importance in humid areas with poorly or somewhat poorly drained soils to maximize agricultural productivity Excess precipitation in Iowa and many other Mississippi/Ohio River watershed agricultural production states is removed artificially via subsurface drainage systems that intercept and usually divert it to surface waters. Subsurface drainage systems have been installed to allow timely seedbed preparation, planting and harvesting and to protect crops from extended periods of flooded soil conditions. The tradeoff of improved subsurface drainage is a significant increase in the losses of nitrate-nitrogen (Gilliam ...


The "Root" Of Drought Problems, Elwynn Taylor Nov 2006

The "Root" Of Drought Problems, Elwynn Taylor

Proceedings of the Integrated Crop Management Conference

Agricultural plants require moisture, but there is more to it than a simple need for rain or irrigation. Under conditions that depend on precipitation to replenish crop available soil moisture it is easy to conclude that the success of the crop depends upon the rain. This is in large measure true , yet considerable variations in yields are found in areas with like precipitation. The "law of limiting factors" holds that at any given moment there is only one factor limiting the growth of a plant. It may be some aspect of soil fertility, or temperature, or light, or carbon dioxide ...


Wisconsin Farmers Take The 2-Pass Challenge Against Weeds, Richard T. Proost, Daniel J. Heider, Chris M. Boerboom Nov 2006

Wisconsin Farmers Take The 2-Pass Challenge Against Weeds, Richard T. Proost, Daniel J. Heider, Chris M. Boerboom

Proceedings of the Integrated Crop Management Conference

Single pass herbicide programs have become the standard for most Wisconsin corn producers. The apparent time and cost savings in controlling weeds with a single pre or post-emergence herbicide application is the driving force behind this trend. While there are situations where a single pass program will work, it has weaknesses that can result in inconsistent performance.


Site-Specific Tillage Management And Crop Yield Response, Mahdi Al-Kaisi Nov 2006

Site-Specific Tillage Management And Crop Yield Response, Mahdi Al-Kaisi

Proceedings of the Integrated Crop Management Conference

Tillage decision is only one issue farmers have to make during fall. There are many factors that need to be considered in selecting a tillage system for any given field or region within the state. Those factors are soil conditions, which can include, soil slope, soil drainage, top soil depth or the A-horizon depth. Other factors need to be considered, which are equally important. They are management factors, such as, residue cover, type of residue (corn or soybean), soil moisture condition at the time of making the decision, timing of tillage operation, fertilizer management in conjunction with tillage operation, type ...


Weed Management Update - Who Cares?, Micheal D. K. Owen Nov 2006

Weed Management Update - Who Cares?, Micheal D. K. Owen

Proceedings of the Integrated Crop Management Conference

Despite the importance of glyphosate-based crop systems, there is a need for continued investigation and development of new tactics to manage weeds effectively and economically. It is interesting that larger farm size and higher percentage of income attributable to grain is associated with growers willingness to accept alternative weed management strategies and the adoption of integrated weed management programs (Hammond et al. 2006). The concern for timely weed management in order to protect crop yields becomes premiere in POST-based corn and soybean systems, whether based on glyphosate or any other herbicide (Halford et al. 200 l; Cox et al. 2006 ...