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Full-Text Articles in Life Sciences

Characterization Of The Natural Enemy Community, With Emphasis On Entomopathogens, For Management Of Western Corn Rootworm (Diabrotica Virgifera Virgifera) In West Central Nebraska, Camila Oliveira-Hofman Aug 2018

Characterization Of The Natural Enemy Community, With Emphasis On Entomopathogens, For Management Of Western Corn Rootworm (Diabrotica Virgifera Virgifera) In West Central Nebraska, Camila Oliveira-Hofman

Dissertations and Student Research in Entomology

Diabrotica virgifera virgifera LeConte (Coleoptera: Chrysomelidae),the western corn rootworm (WCR), is a major pest of corn (Zea mays L.) in the United States and Europe. WCR management options comprise mainly transgenic hybrids, insecticide applications and crop rotation. WCR is highly adaptable to management practices and field-evolved resistance to transgenic corn, insecticides and crop rotation in the United States Corn Belt has been reported. Therefore, the motivation for this project was to look into alternative options for WCR management. The goal of this dissertation is to characterize the natural enemies from irrigated commercial cornfields in Nebraska and examine their potential ...


Comparing Strip Trials Of Chicken Litter, Compost, Hog Manure, And Wet Cattle Manure On Soil Fertility, Tanner Douma, Emily Hummel, Wendi Jo Vande Voort May 2018

Comparing Strip Trials Of Chicken Litter, Compost, Hog Manure, And Wet Cattle Manure On Soil Fertility, Tanner Douma, Emily Hummel, Wendi Jo Vande Voort

Student Work

Utilizing agriculture animal and biodegradable waste can reduce the input costs of fertilizers while enhancing the soil. This comparative study focuses on the nutrient values soil receives from agricultural waste. The central objective was, “Due to the historical over-application of manure leading to environmental concerns, a comparative study of soil fertility and economic viability of manures and compost are analyzed in a one-year study”. On an 18.7 acre corn plot, 11 strips were applied with four different manure types, which were randomized, during the 2017 growing season. Chicken litter, compost, hog manure, wet cattle manure, and control strips were ...


A Systems Modeling Approach To Forecast Corn Economic Optimum Nitrogen Rate, Laila A. Puntel, John E. Sawyer, Daniel W. Barker, Peter J. Thorburn, Michael J. Castellano, Kenneth J. Moore, Andy Vanloocke, Emily A. Heaton, Sotirios V. Archontoulis Apr 2018

A Systems Modeling Approach To Forecast Corn Economic Optimum Nitrogen Rate, Laila A. Puntel, John E. Sawyer, Daniel W. Barker, Peter J. Thorburn, Michael J. Castellano, Kenneth J. Moore, Andy Vanloocke, Emily A. Heaton, Sotirios V. Archontoulis

Agronomy Publications

Historically crop models have been used to evaluate crop yield responses to nitrogen (N) rates after harvest when it is too late for the farmers to make in-season adjustments. We hypothesize that the use of a crop model as an in-season forecast tool will improve current N decision-making. To explore this, we used the Agricultural Production Systems sIMulator (APSIM) calibrated with long-term experimental data for central Iowa, USA (16-years in continuous corn and 15-years in soybean-corn rotation) combined with actual weather data up to a specific crop stage and historical weather data thereafter. The objectives were to: (1) evaluate the ...


Foliar Fertilization Of Corn In Northeast Iowa, Jay Matthews Jan 2018

Foliar Fertilization Of Corn In Northeast Iowa, Jay Matthews

Creative Components

Corn (Zea mays L.) is one of the most widely grown crops in the world and is the largest crop grown in Iowa. In contrast to research on foliar fertilization of soybean (Glycine max L. Merr.), research on foliar fertilization for corn with macronutrients and secondary nutrients has been scarce in Iowa and the upper Midwest region. As corn yields have continued to increase growers have questioned the capacity of the soil to provide all the nutrients needed to maximize corn yield. One solution that has been offered is the application of a foliar fertilizer. As new foliar fertilizer products ...


Variation In Maize Hybrid Germplasm Performance Following A Winter Rye Cover Crop, Mike Witt Jan 2018

Variation In Maize Hybrid Germplasm Performance Following A Winter Rye Cover Crop, Mike Witt

Creative Components

Cover crop introgression into conventional corn and soybean rotational systems is a practice employed by some farmers in today’s upper Midwest farming landscape. The most utilized cover crop species in the state of Iowa has been winter cereals, specifically winter rye (Secale cereale L.) (Miguez, 2016). However, the two main factors hindering a greater adoption of rye cover cropping systems are the reported yield reductions in corn produced following a winter rye cover crop (Acharya et al., 2017) and time constraints for spring planting of corn (Johnson, 1998). Both of these factors can add significant investments to farmers that ...


Effect Of Late Nitrogen Applications On Grain Filling In Corn, J. A. Fernandez, I. A. Ciampitti Jan 2018

Effect Of Late Nitrogen Applications On Grain Filling In Corn, J. A. Fernandez, I. A. Ciampitti

Kansas Agricultural Experiment Station Research Reports

In order to evaluate the effect of nitrogen (N) with late-season fertilizer applications in corn, grain yield and grain filling parameters were evaluated for three genotypes under three N levels. Hybrids with different release years (3394, 1990s; P1151, 2000s; and P1197, 2016) and contrasting N application scenarios (zero-N, N at flowering, and N two weeks after flowering) were evaluated in two studies (dryland and irrigated) at the Ashland Bottoms Research Farm, Manhattan, KS, 2017 season. Results showed that under N stress conditions, the absence of N fertilization in corn significantly reduced yields, by affecting both grain number (GN) and grain ...


Effect Of Fungicides On Southern Rust Of Corn, E. A. Adee, S. Duncan Jan 2018

Effect Of Fungicides On Southern Rust Of Corn, E. A. Adee, S. Duncan

Kansas Agricultural Experiment Station Research Reports

The decision to apply fungicides to corn is not an easy decision in Kansas, especially when grain prices are low. Numerous factors determine what diseases are present, and whether the plants will be defoliated enough to reduce yield. Correctly identifying the disease, knowing what environmental conditions favor the development of an epidemic, and knowing the hybrid’s resistance to the diseases can be known before making the decision. However, knowing if the conditions will be favorable for the spread of the disease up the plant is very unpredictable. A situation like a ‘perfect storm’ for foliar diseases defoliating corn occurred ...


Effects Of Supplementation With Corn Or Dried Distillers Grains On Gains Of Heifer Calves Grazing Smooth Bromegrass Pastures, L. W. Lomas, J. L. Moyer Jan 2018

Effects Of Supplementation With Corn Or Dried Distillers Grains On Gains Of Heifer Calves Grazing Smooth Bromegrass Pastures, L. W. Lomas, J. L. Moyer

Kansas Agricultural Experiment Station Research Reports

Distillers grains, a by-product of the ethanol industry, have tremendous potential as an economical and nutritious supplement for grazing cattle. Distillers grains contain a high concentration of protein (25 to 30%), with more than two-thirds escaping degradation in the rumen, which makes it an excellent supplement for younger cattle. Recent advancements in the ethanol manufacturing process have resulted in extraction of a greater amount of fat; therefore, creating distillers grains that may contain less energy than corn. This research was conducted to compare performance of stocker cattle supplemented with corn or DDG at 0.5% body weight per head daily ...


Tillage Study For Corn And Soybeans: Comparing Vertical, Deep, And No-Tillage, E. A. Adee Jan 2018

Tillage Study For Corn And Soybeans: Comparing Vertical, Deep, And No-Tillage, E. A. Adee

Kansas Agricultural Experiment Station Research Reports

Trends from a tillage study conducted since 2011 are beginning to show that corn yields are greater when there is an occasional deep tillage. The yield of soybeans have not been affected significantly by tillage systems ranging from no-till to conventional tillage every year.


Evaluation Of The Effects Of High-Lysine Sorghum On Nursery Pig Performance, L. L. Thomas, R. D. Goodband, C. D. Espinosa, H. H. Stein, J. C. Woodworth, M. D. Tokach, S. S. Dritz, J. M. Derouchey Jan 2018

Evaluation Of The Effects Of High-Lysine Sorghum On Nursery Pig Performance, L. L. Thomas, R. D. Goodband, C. D. Espinosa, H. H. Stein, J. C. Woodworth, M. D. Tokach, S. S. Dritz, J. M. Derouchey

Kansas Agricultural Experiment Station Research Reports

Two experiments were conducted to determine the standardized ileal digestibility (SID) of amino acids in a high-lysine sorghum cultivar, followed by a growth trial to determine the effect of this sorghum on pig performance using increasing additions of feed-grade amino acids at the expense of soybean meal. In Exp. 1, ten growing barrows (initially 57.1 lb; Line 359 × 1050; PIC, Hendersonville, TN) were surgically fitted with a T-cannula at the terminal ileum and randomly assigned to 1 of 5 test diets in a 5-period, cross-over design. Experimental diets consisted of a corn-based diet, a diet containing high-lysine sorghum, or ...


Crop Production Summary, Southeast Kansas – 2017, G. F. Sassenrath, L. Mengarelli, J. Lingenfelser, X. Lin, D. E. Shoup Jan 2018

Crop Production Summary, Southeast Kansas – 2017, G. F. Sassenrath, L. Mengarelli, J. Lingenfelser, X. Lin, D. E. Shoup

Kansas Agricultural Experiment Station Research Reports

Crop production is dependent on many factors, most notably, environmental conditions during the growing season. Here, we summarize the environmental conditions during the 2017 growing season in comparison to previous years and the historical averages. Information on crop yields is taken from reported values and yields from variety trials in southeast and east central Kansas.


Effects Of Increasing Oat Groats On Nursery Pig Performance, J. A. Chance, A. B. Lerner, J. M. Derouchey, J. C. Woodworth, M. D. Tokach, R. D. Goodband, S. S. Dritz Jan 2018

Effects Of Increasing Oat Groats On Nursery Pig Performance, J. A. Chance, A. B. Lerner, J. M. Derouchey, J. C. Woodworth, M. D. Tokach, R. D. Goodband, S. S. Dritz

Kansas Agricultural Experiment Station Research Reports

In Exp. 1, a total of 225 pigs (241 × 600, DNA, Columbus, NE; initially 13.9 lb BW) were used in a 28-d study to evaluate the effects of increasing ground oat groats on nursery pig growth performance. Pigs were weaned at 21 d of age and randomly allotted to pens and fed a commercial starter diet for 7 d prior to the start of the experiment. Pens of pigs were assigned to 1 of 5 dietary treatments in a randomized complete block design by body weight (BW) with 4 or 5 pigs per pen and 10 pens per treatment ...


Prevalence And Amount Of Feral Swine Damage To Three Row Crops At Planting, Richard M. Engeman, Jason Terry, Leif R. Stephens, Kenneth S. Gruver Jan 2018

Prevalence And Amount Of Feral Swine Damage To Three Row Crops At Planting, Richard M. Engeman, Jason Terry, Leif R. Stephens, Kenneth S. Gruver

USDA National Wildlife Research Center - Staff Publications

Feral swine damage to corn, cotton and peanut crops at planting was assessed for 46 fields in Alabama. Damage was assessed on the basis of prevalence among fields and the quantity lost within each damaged field. Feral swine control by professionals dedicated to that task appeared to greatly reduce the prevalence of damage among fields, as the 14 fields which were within the areas where professional swine control operations took place were not damaged. For the 32 fields not receiving such protection, seven (21.9%) received some level of damage. Of those, 40% (four of 10) peanut fields, 15.4 ...


Timing Of Side-Dress Applications Of Nitrogen For Corn In Conventional And No-Till Systems, D. W. Sweeney, D. E. Shoup, Dorivar Ruiz Diaz Jan 2018

Timing Of Side-Dress Applications Of Nitrogen For Corn In Conventional And No-Till Systems, D. W. Sweeney, D. E. Shoup, Dorivar Ruiz Diaz

Kansas Agricultural Experiment Station Research Reports

Environmental conditions vary widely in the spring in southeastern Kansas. As a result, much of the N applied prior to corn planting may be lost before the time of maximum plant N uptake. Side-dress or split applications to provide N during rapid growth periods may improve N use efficiency while reducing potential losses to the environment. The objective of this study was to determine the effect of timing of side-dress N fertilization compared with pre-plant N applications for corn grown on a claypan soil.


Tillage And Nitrogen Placement Effects On Yields In A Short-Season Corn/Wheat/ Double-Crop Soybean Rotation, D. W. Sweeney, Dorivar Ruiz Diaz Jan 2018

Tillage And Nitrogen Placement Effects On Yields In A Short-Season Corn/Wheat/ Double-Crop Soybean Rotation, D. W. Sweeney, Dorivar Ruiz Diaz

Kansas Agricultural Experiment Station Research Reports

Many crop rotation systems are used in southeastern Kansas. This experiment was designed to determine the long-term effect of selected tillage and N fertilizer placement options on yields of short-season corn, wheat, and double-crop soybean in a rotation.


Syngenta Enhanced Feed Corn (Enogen) Containing An Alpha Amylase Expression Trait Improves Feed Efficiency In Growing Calf Diets, M. A. Johnson, T. J. Spore, S. P. Montgomery, C. S. Weibert, J. S. Garzon, W. R. Hollenbeck, R. N. Wahl, E. D. Watson, Dale Blasi Jan 2018

Syngenta Enhanced Feed Corn (Enogen) Containing An Alpha Amylase Expression Trait Improves Feed Efficiency In Growing Calf Diets, M. A. Johnson, T. J. Spore, S. P. Montgomery, C. S. Weibert, J. S. Garzon, W. R. Hollenbeck, R. N. Wahl, E. D. Watson, Dale Blasi

Kansas Agricultural Experiment Station Research Reports

Objective: To determine the response of growing calves when fed Enogen Feed (Syngenta) corn, containing an alpha amylase expression trait.

Description: A total of 384 English crossbred steers having an average weight of 538 lb and originating from Texas were used to determine the effects on performance when fed Enogen Feed corn as either whole shelled or processed as dry-rolled at ad libitum intake.

The Bottom Line: When fed in an ad libitum fashion to growing calves, Enogen Feed corn improves feed efficiency of growing calves by 5.50%.


Discrete Element Model Calibration Using Multi-Responses And Simulation Of Corn Flow In A Commercial Grain Auger, Mehari Tekeste, Mohammad Mousaviraad, Kurt A. Rosentrater Jan 2018

Discrete Element Model Calibration Using Multi-Responses And Simulation Of Corn Flow In A Commercial Grain Auger, Mehari Tekeste, Mohammad Mousaviraad, Kurt A. Rosentrater

Agricultural and Biosystems Engineering Publications

Grain augers are primary grain conveying equipment in agriculture. Quantitative prediction of dynamic grain flow in grain augers using discrete element modeling (DEM) has potential to support simulation-based engineering design of grain handling equipment. The objective of this study was to develop a DEM corn model using a multi-response calibration methodology and validation of combine-harvested corn flow in a commercial grain auger. Using a Latin hypercube design of experiment (DOE) sampling from four particle interaction DEM parameters values, 27 DEM simulations were generated for four DEM corn shape approximations (1-sphere, 2-spheres, 5-spheres, and 13-spheres) to create virtual DEM experiments of ...


Impaired Phloem Loading In Zmsweet13a,B,C Sucrose Transporter Triple Knock-Out Mutants In Zea Mays, Margaret Bezrutczyk, Thomas Hartwig, Marc Horschman, Si Nian Char, Jinliang Yang, Bing Yang, Wolf B. Frommer, Davide Sosso Jan 2018

Impaired Phloem Loading In Zmsweet13a,B,C Sucrose Transporter Triple Knock-Out Mutants In Zea Mays, Margaret Bezrutczyk, Thomas Hartwig, Marc Horschman, Si Nian Char, Jinliang Yang, Bing Yang, Wolf B. Frommer, Davide Sosso

Agronomy & Horticulture -- Faculty Publications

Crop yield is critical for human nutrition, yet the underlying machinery that ultimately determines yield potential is still not understood. Crop productivity under ideal conditions is determined by the efficiency with which plants intercept light, convert it into chemical energy, translocate photosynthates and convert these to storage products in harvestable organs (Zhu et al., 2010). In many crops, sucrose is the primary form for translocation inside the conduit (i.e. the phloem). A combination of SWEETmediated efflux from phloem parenchyma and subsequent secondary active sucrose import by SUT sucrose/H+ symporters is thought to create the driving force for pressure ...


Spatial Variation In Western Corn Rootworm (Coleoptera: Chrysomelidae) Susceptibility To Bacillus Thuringiensis Corn Events In Nebraska, Jordan D. Reinders Dec 2017

Spatial Variation In Western Corn Rootworm (Coleoptera: Chrysomelidae) Susceptibility To Bacillus Thuringiensis Corn Events In Nebraska, Jordan D. Reinders

Dissertations and Student Research in Entomology

The western corn rootworm (WCR), Diabrotica virgifera virgifera LeConte, is an economically important pest species of field corn (Zea mays L.) in the U.S. Corn Belt. Yield losses and control costs exceed greater than $1 billion annually. Over the past 10+ years, growers have adopted transgenic corn hybrids expressing rootworm-active Bacillus thuringiensis (Bt) proteins as a primary WCR management tactic. Field-evolved resistance to Cry3Bb1 and mCry3A proteins expressed in single-trait Bt hybrids has been confirmed in some areas of Nebraska. Growers have used different tactics as needed to prevent or mitigate resistance, resulting in a mosaic of selection pressure ...


Nitrogen Availability And Use Efficiency In Corn Treated With Contrasting Nitrogen Sources, Avneet Kakkar Dec 2017

Nitrogen Availability And Use Efficiency In Corn Treated With Contrasting Nitrogen Sources, Avneet Kakkar

All Graduate Theses and Dissertations

The plant-soil nitrogen cycle plays a significant role in allocation of available N to plants, and improved understanding of N cycling helps sustainably increase fertilizer use efficiency. There are various processes (nitrogen mineralization and nitrification) involved in the availability and mobility of nitrogen in the soil. The primary objective of this study was to determine the NUE under contrasting nitrogen treatments over a period of five years. Additionally, we examined the effect of different N treatments on N mineralization and nitrification in conventional and organic farming systems.

This project was funded by Agriculture and Food Research Initiative Competitive Grants Program ...


Jaggers, Katie Thompson (Fa 1107), Manuscripts & Folklife Archives Nov 2017

Jaggers, Katie Thompson (Fa 1107), Manuscripts & Folklife Archives

FA Finding Aids

Finding aid only for Folklife Archives Project 1107. Paper titled “Methods of Corn Production in an Edmonson Co[unty] Community” in which Katie Jaggers Charts the history of corn harvesting by traditional means, such as using mules, shovels, wagons, and A-harrows, up through the current practice of employing highly-tech machinery. Paper is based on information collected by Jaggers from two brothers, Edgar and Harry Thompson, who resided in Lindseyville, Kentucky. Collection also includes color photos and descriptions of traditional farming machinery.


Arkansas Corn And Grain Sorghum Peformance Tests 2017, R. D. Bond, J. A. Still, D. G. Dombek Oct 2017

Arkansas Corn And Grain Sorghum Peformance Tests 2017, R. D. Bond, J. A. Still, D. G. Dombek

Research Series

Corn and grain sorghum performance tests are conducted each year in Arkansas by the University of Arkansas System Division of Agriculture. The tests provide information to companies marketing seed within the state, and aid the Arkansas Cooperative Extension Service in formulating recommendations for producers.


Response To Selection And Changes In Genetic Parameters For 13 Plant And Ear Traits In Two Maize Recurrent Selection Programs, J. F. Holthaus, K. R. Lamkey Sep 2017

Response To Selection And Changes In Genetic Parameters For 13 Plant And Ear Traits In Two Maize Recurrent Selection Programs, J. F. Holthaus, K. R. Lamkey

Kendall R Lamkey

Recurrent selection is a cyclical breeding procedure that focuses on improving the mean performance of a population by increasing the frequency of favorable alleles and maintaining adequate genetic variability for continued selection response. The Iowa Stiff Stalk Synthetic (BSSS) maize (Zea mavs L.) population has undergone continuous recurrent selection for more than 50 years as the base population for two independent selection programs. This study was designed to estimate the mean performance and important genetic parameters in BSSS before and after seven cycles of half- sib (I IS) progeny selection, six cycles of Srprogeny selection, and 11 cycles of reciprocal ...


Evaluation Of A Modified Reciprocal Recurrent Selection Procedure For Maize Improvement, W. A. Russell, D. J. Blackburn, Kendall R. Lamkey Sep 2017

Evaluation Of A Modified Reciprocal Recurrent Selection Procedure For Maize Improvement, W. A. Russell, D. J. Blackburn, Kendall R. Lamkey

Kendall R Lamkey

Reciprocal recurrent selection in maize (:Zea mays L.) has been ve1y successful in improving yields of crosses of two populations wherein each population has been used as a tester for the other. A modification of the procedure was suggested that uses two inbred lines as testers instead of the populations. The purpose of our research was to compare the two procedures for progress achieved after three cycles of recurrent selection. The populations were BS21 and BS22 Synthetics used in a reciprocal recurrent selection program (BS21R x BS22R). For the modified procedure, inbred A632 was the tester for BS21, [BS21(A632Hl ...


Fifty Years Of Recurrent Selection In The Iowa Stiff Stalk Synthetic Maize Population, K. R. Lamkey Sep 2017

Fifty Years Of Recurrent Selection In The Iowa Stiff Stalk Synthetic Maize Population, K. R. Lamkey

Kendall R Lamkey

Recurrent selection is a breeding procedure designed to increase the frequency of favorable alleles in a population. Increasing the frequency of favorable alleles will increase the probability of obtaining surerior inbred line.s for use in hybrids. The Iowa Stiff Stalk Synthetic (BSSS) maize (£ea mays I..) population has been involved in continuous recurrent selection since 1939. Thirteen cycles of selection have been completed . The first seven cycles were half-sib selection using the double-cross lowa 13 as a tester. After completion of seven cycles of half-sih selection, the population was renamed BSU and six cycles of S2-progeny selection were completed ...


Comparison Of Phenotypic Correlations Among S1 Lines, And Their Testcrosses, From Four Iowa Stiff Stalk Populations Of Maize, S. P. Walters, W. A. Russell, K. R. Lamkey Sep 2017

Comparison Of Phenotypic Correlations Among S1 Lines, And Their Testcrosses, From Four Iowa Stiff Stalk Populations Of Maize, S. P. Walters, W. A. Russell, K. R. Lamkey

Kendall R Lamkey

Relationships between agronomic traits of maize (Zea mays L.) parental lines and traiits of hybrid progenies are important for breeders. If significant improvements in source populations are made by such procedures as recurrent selection, a breeder should know how such changes affect relationships between traits of parental lines and hybrid progenies. Correlations between agronomic traits and grain yield among random S1 lines and S1 line testcrosses from the original Iowa Stiff Stalk Synthetic (BSSSC0) maize (Zea mays L.) population, two improved strains of BSSS [BS13(S)C3 and BSSS(R )C9], and the intermated cross between the two improved populations ...


Isozyme Allelic Frequency Changes Following Maize (Zea Mays L.) Germplasm Regeneration, R. E. Reedy, A. D. Knapp, K. R. Lamkey Sep 2017

Isozyme Allelic Frequency Changes Following Maize (Zea Mays L.) Germplasm Regeneration, R. E. Reedy, A. D. Knapp, K. R. Lamkey

Kendall R Lamkey

Germplasm collections serve the essential function of preserving genetic diversity. Genetic drift, the erratic, random fluctuation in gene frequency that can result from inadequate sampling during periodic regeneration of accessions, and selection have the potential to change the genetic identity of germplasm collections. Random genetic drift may lead to either fixation or loss of alleles. Small numbers of parents used in early regeneration cycles may reduce variability from that present in the original population. The degree of diversity in five maize germplasm accessions was measured as a function of isozyme polymorphism and allelic frequencies were examined following several cycles of ...


Comparison Of Maize Populations Improved By Recurrent Selection, K. R. Lamkey, A. R. Hallauer Sep 2017

Comparison Of Maize Populations Improved By Recurrent Selection, K. R. Lamkey, A. R. Hallauer

Kendall R Lamkey

A diallel set of crosses among 10 synthetic varieties of maize (Zea mays L.) were evaluated in eight environments. All varieties, except BSSS, had undergone recurrent selection for either yield or pest resistance. Objectives of the study were to determine relative performance of varieties per se and in crosses with other improved varieties. Varieties improved by recurrent selection for yield were superior in yield to those improved for pest resistance. It seemed that single-trait selection for pest resistance caused a redirection of photosynthate. BS13(S)C2 x BS18 yielded 8902 kg ha-1, which was within one LSD (0.05)of ...


Thesis Document 07172017 Revised.Pdf, Jesse Gray Aug 2017

Thesis Document 07172017 Revised.Pdf, Jesse Gray

Jesse Gray

iv
Abstract
The increasing cost of commercial fertilizers and the avail
ability of animal waste
that has high nutrient content have led to producers utilizing animal waste such as poultry
litter in their fertility programs. This increased use has raised concerns as to what are the
optimum rates to apply to meet crop needs and
how will long term use at high rates of
litter effect soil test levels of nutrients such as phosphorus and potassium. The objective
of this study was to address these concerns. This study has been ongoing since 1998 with
treatments of zero to seven tons ...


Analysis Of The Flow Behaviors Of Corn Meal During Extrusion, Daniel N. Hauersperger, Martin R. Okos, Troy Tonner Aug 2017

Analysis Of The Flow Behaviors Of Corn Meal During Extrusion, Daniel N. Hauersperger, Martin R. Okos, Troy Tonner

The Summer Undergraduate Research Fellowship (SURF) Symposium

Food extrusion can be used to make many products we consume today, including pasta, cereals and more. The ability to predict the characteristics of the final product from an extruder using raw material characteristics and operating conditions is vital to the extrusion process. In order to answer this need, the flow behavior of corn meal was measured in a lab viscometer (off-line) and compared to the flow behaviors from an extruder (in-line) at three different moisture contents (32.5%, 35%, 37.5% wet basis). The extruder and product are heated through the friction of the corn meal passing through the ...