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Agricultural Science

2005

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Articles 91 - 116 of 116

Full-Text Articles in Life Sciences

From Metchnikoff To Monsanto And Beyond: The Path Of Microbial Control, Jeffrey C. Lord Jan 2005

From Metchnikoff To Monsanto And Beyond: The Path Of Microbial Control, Jeffrey C. Lord

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

In 125 years since Metchnikoff proposed the use of Metarhizium anisopliae to control the wheat cockchafer and brought about the first field trials, microbial control has progressed from the application of naturalists’ observations to biotechnology and precision delivery. This review highlights major milestones in its evolution and presents a perspective on its current direction. Fungal pathogens, the most eye-catching agents, dominated the early period, but major mycological control efforts for chinch bugs and citrus pests in the US had questionable success, and interest waned. The discoveries of Bacillus popilliae and Bacillus thuringiensis began the era of practical and commercially viable …

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Lamb Production Of Dorper, Katahdin, And St. Croix Bred In Summer, Winter, Or Spring In The Southeastern United States, J. M. Burke Jan 2005

Lamb Production Of Dorper, Katahdin, And St. Croix Bred In Summer, Winter, Or Spring In The Southeastern United States, J. M. Burke

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Ewe production traits and ability to breed out of season were compared for the Dorper (DO), Katahdin (KA), and St. Croix (SC) breeds between 2000 and 2005. Sheep were managed on grass pasture and were supplemented with corn/soybean meal and free-choice, trace-mineral mix. Ewes were exposed to rams of their respective breeds in late summer (August/September), winter (December), or spring (April/ May) for 30-day breeding periods. Lambs were weighed at birth and 60 days of age. Pregnancy and lambing rates and litter birth weight were greater for all breeds bred in winter and lowest in spring. Pregnancy losses were greater …

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Feedlot Performance And Carcass Characteristics Of Lambs Sired By Texel, Romanov, St. Croix Or Dorset Rams From Polypay And St. Croix Ewes, W. A. Phillips, M. A. Brown, H. G. Dolezal, G. Q. Fitch Jan 2005

Feedlot Performance And Carcass Characteristics Of Lambs Sired By Texel, Romanov, St. Croix Or Dorset Rams From Polypay And St. Croix Ewes, W. A. Phillips, M. A. Brown, H. G. Dolezal, G. Q. Fitch

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Over a 2-year period, crossbred lambs resulting from the mating of Texel (T), Romanov (R), and St. Croix (S) rams with Polypay (P) and S ewes, were finished during the summer and late fall to determine feedlot performance and carcass characteristics. A total of 175 wether lambs of the five genotypes (R x P, R x S, S x S, T x P and T x S) were fed a high-energy diet for an average of 110 d (Experiment 1). Purebred St. Croix lambs weighed less (P < 0.05) at the beginning and end of the finishing period, had the lowest average daily gain (ADG) (P < 0.05), and the lowest Gain:Feed (P < 0.10) of the five genotypes evaluated. All five genotypes produced carcasses with a quality grade ≥ Choice. In a subsequent 2-year experiment (Experiment 2), 251 lambs sired by either Dorset or St. Croix rams from the ewes created in Exp.1 were used. Dorset-sired lambs were heavier (P < 0.10) at the end of the feeding period and had greater ADG (P < 0.10) than lambs sired by St. Croix rams. Wether lambs were heavier (P < 0.10), grew faster (P < 0.10) and ate more (P<0.05) feed than female lambs. Lambs from crossbred ewes were heavier (P <0.05) at the beginning and end of the finishing period and grew faster (P < 0.10) than lambs from purebred St. Croix ewes. When Dorset rams were used as the terminal sire, lamb feedlot performance was similar among the five ewe genotypes used in this study.

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Predicting Plant Extinction Based On Species-Area Curves In Prairie Fragments With High Beta Richness, Brian J. Wilsey, Leanne M. Martin, H. Wayne Polley Jan 2005

Predicting Plant Extinction Based On Species-Area Curves In Prairie Fragments With High Beta Richness, Brian J. Wilsey, Leanne M. Martin, H. Wayne Polley

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Species-area relationships and island biogeography theory are commonly used to predict how species richness will decline with fragmentation. There are a variety of largely untested assumptions in these approaches, including the assumptions that populations are distributed uniformly before fragmentation, and that local extinctions are due to effects of small population sizes. If populations are not distributed uniformly, then populations can be abundant locally but rare globally. This would cause extinction rates to be smaller than predicted.We tested extinction theory by developing estimates of the number of plant species that should be present in small tallgrass prairie fragments and then testing …

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Patterns Of Plant Species Diversity In Remnant And Restored Tallgrass Prairies, H. Wayne Polley, Justin D. Derner, Brian J. Wilsey Jan 2005

Patterns Of Plant Species Diversity In Remnant And Restored Tallgrass Prairies, H. Wayne Polley, Justin D. Derner, Brian J. Wilsey

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

To restore diversity of native vegetation, we must understand factors responsible for diversity in targeted communities. These factors operate at different spatial scales and may affect the number and relative abundances of species differently. We measured diversity of plant species and functional groups of species in replicated plots within paired restored and remnant (relic) tallgrass prairies at three locations in central Texas, U.S.A.

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Plant Functional Group Diversity As A Mechanism For Invasion Resistance, Monica L. Pokorny, Roger L. Sheley, Catherine A. Zabinski, Richard E. Engel, Tony J. Svejcar, John J. Borkowski Jan 2005

Plant Functional Group Diversity As A Mechanism For Invasion Resistance, Monica L. Pokorny, Roger L. Sheley, Catherine A. Zabinski, Richard E. Engel, Tony J. Svejcar, John J. Borkowski

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

A commonly cited mechanism for invasion resistance is more complete resource use by diverse plant assemblages with maximum niche complementarity. We investigated the invasion resistance of several plant functional groups against the nonindigenous forb Spotted knapweed (Centaurea maculosa). The study consisted of a factorial combination of seven functional group removals (groups singularly or in combination) and two C. maculosa treatments (addition vs. no addition) applied in a randomized complete block design replicated four times at each of two sites.

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Growth Performance Of Barbados Blackbelly, Katahdin And St. Croix Hair Sheep Lambs Fed Pasture- Or Hay-Based Diets, S. Wildeus, K. E. Turner, J. R. Collins Jan 2005

Growth Performance Of Barbados Blackbelly, Katahdin And St. Croix Hair Sheep Lambs Fed Pasture- Or Hay-Based Diets, S. Wildeus, K. E. Turner, J. R. Collins

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Two experiments evaluated growth of mixed-sex Barbados Blackbelly, Katahdin, and St. Croix hair sheep lambs raised on pasture or hay-based diets with moderate levels of energy supplementation. In Experiment 1, 36 ewe and wether lambs were allocated to a pasture or pen feeding group in May. Pasture animals rotationally grazed tall fescue pasture, while pen animals were offered chopped alfalfa hay, and both groups were supplemented with corn/soybean meal at 0.75% of body weight. In Experiment 2, 72 lambs were allocated to pen and pasture in April, and provided either a low or high crude protein concentration corn/soybean meal supplement …

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Phosphorus Dynamics In Broiler Litter-Amended Soils, A. Adeli, K. R. Sistani, M. F. Bal'a, D. E. Rowe Jan 2005

Phosphorus Dynamics In Broiler Litter-Amended Soils, A. Adeli, K. R. Sistani, M. F. Bal'a, D. E. Rowe

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Because land application of broiler litter is commonly made in the spring before cropping season and in the fall, it is essential to understand how environmental variations, such as temperature, affect the phosphorus (P) dynamics. A laboratory incubation study was conducted at Waste Management and Forage Research Unit, USDAARS with the objective of determining the effects of temperature and soil properties on water-soluble P (WSP), Mehlich 3 P, and P fractions in broiler litter-amended soils. Broiler litter was mixed with three soils (Leeper silty clay, Grenada silt loam, and Ruston sandy loam) at the rate of 10 Mg ha-1 …

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Composition Of Irrigation Water Salinity Affects Growth Characteristics And Uptake Of Selenium And Salt Ions By Soybean, D. Wang, C. M. Grieve, D. L. Suarez Jan 2005

Composition Of Irrigation Water Salinity Affects Growth Characteristics And Uptake Of Selenium And Salt Ions By Soybean, D. Wang, C. M. Grieve, D. L. Suarez

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

A greenhouse study was conducted to determine the effects of irrigation waters differing in salt composition on growth characteristics, salt ion and selenium (Se) accumulation, and distribution in plant components of the soybean (Glycine max L. Merr.) cultivar “Manokin.” Plants were grown in sand cultures and irrigated with isoosmotic solutions containing (1) Cl− as the dominant anion, or (2) a mixture of salts containing equal molar amounts of SO2-4 and Cl−. Six treatments of each salinity type were imposed. Electrical conductivities of the irrigation waters ranged from 2.1 to 13.0 dSm−1. Selenium …

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Protocols For Nationally Coordinated Laboratory And Field Research On Manure Nitrogen Mineralization, C. W. Honeycutt, T. S. Griffin, Brian J. Wienhold, Bahman Eghball, S. L. Albrecht, J. M. Powell, B. L. Woodbury, K. R. Sistani, R. K. Hubbard, H. A. Torbert, R. A. Eigenberg, R. J. Wright, M. D. Jawson Jan 2005

Protocols For Nationally Coordinated Laboratory And Field Research On Manure Nitrogen Mineralization, C. W. Honeycutt, T. S. Griffin, Brian J. Wienhold, Bahman Eghball, S. L. Albrecht, J. M. Powell, B. L. Woodbury, K. R. Sistani, R. K. Hubbard, H. A. Torbert, R. A. Eigenberg, R. J. Wright, M. D. Jawson

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The National Program structure of USDA-ARS provides an opportunity to coordinate research on problems of national and global significance. A team of USDA-ARS scientists is conducting nationally coordinated research to develop predictions of manure N availability to protect water quality and improve farm solvency. Experimental design and research protocols were developed and used in common across all participating locations. Laboratory incubations are conducted at each location with a minimum of three soils, three temperatures, two wetting/drying regimes, and two manure treatments. A soil from the central United States (Catlin silt loam, fine-silty, mixed, superactive, mesic Oxyaquic Argiudoll) is used as …

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Laboratory Evaluation Of Mosquito Traps Baited With A Synthetic Human Odor Blend To Capture Aedes Aegypti, Ivoneide M. Silva, Alvaro E. Eiras, Daniel L. Kline, Ulrich R. Bernier Jan 2005

Laboratory Evaluation Of Mosquito Traps Baited With A Synthetic Human Odor Blend To Capture Aedes Aegypti, Ivoneide M. Silva, Alvaro E. Eiras, Daniel L. Kline, Ulrich R. Bernier

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

A synthetic blend of chemicals comprising volatiles released by the human body has been shown to be an effective attractant for female Aedes aegypti in olfactometer bioassays with laboratory-reared mosquitoes. We report the laboratory evaluation of Ae. aegypti response to a synthetic blend tested with 4 types of mosquito traps (CDC model 512, CDC model 1012, CFG, and Fay–Prince traps). Aedes aegypti females were attracted significantly by the blend. The higher release rate of attractant (320.2 ± 10.71 mg/h) more efficiently attracted mosquitoes than the lower release rate (42.0 ± 2.3 mg/h). Although both the Fay–Prince and CFG traps caught …

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Review Of The Black Flies (Simuliidae) Of North America By: Peter H Adler, Douglas C Currie, And D Monty Wood, Jerome Hogsette Jan 2005

Review Of The Black Flies (Simuliidae) Of North America By: Peter H Adler, Douglas C Currie, And D Monty Wood, Jerome Hogsette

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Based on its title, one could expect this volume to be mainly a taxonomic reference for the North American Black Flies, but it is actually much more. The book is organized into five parts, each containing two to three of the 10 total chapters. Part I presents a very comprehensive overview of the subject (Chapter 1), followed by a history of the research (Chapter 2) that contains good historical references, as well as citations that are quite recent. Historical references are always welcome in any review section because they may have been published in regional or local literature that are …

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Winter Feeding Sites Of Hay In Round Bales As Major Developmental Sites Of Stomoxys Calcitrans (Diptera: Muscidae) In Pastures In Spring And Summer, Alberto B. Broce, Jerome Hogsette, Steven Paisley Jan 2005

Winter Feeding Sites Of Hay In Round Bales As Major Developmental Sites Of Stomoxys Calcitrans (Diptera: Muscidae) In Pastures In Spring And Summer, Alberto B. Broce, Jerome Hogsette, Steven Paisley

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The stable fly, Stomoxys calcitrans (L.), historically has been a pest of livestock in confined operations but seldom of animals on pastures or rangelands. In the past two decades, however, S. calcitrans has become a major pest of cattle and horses on pastures in the midwestern United States. Although there usually is an overabundance of diverse stable fly and house fly, Musca domestica L., larval habitats in confined livestock operations, no larval habitat for stable flies has been clearly identified in the pasture-range environment. Because the winter feeding of hay in round bales results in significant amounts of hay wastage …

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Laboratory Bioassays Of Entomopathogenic Fungi For Control Of Delia Radicum (L.) Larvae, Denny J. Bruck, Jane E. Snelling, Amy J. Dreves, Stefan T. Jaronski Jan 2005

Laboratory Bioassays Of Entomopathogenic Fungi For Control Of Delia Radicum (L.) Larvae, Denny J. Bruck, Jane E. Snelling, Amy J. Dreves, Stefan T. Jaronski

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Laboratory soil bioassays were performed at economic Weld rates for in-furrow (3.85 x 106 spores/g dry soil) and broadcast (3.85 x 105 spores/g dry soil) applications with three isolates of Metarhizium anisopliae (F52, ATCC62176, and ARSEF5520) and one isolate of Beauveria bassiana (GHA). All isolates tested were infective to second instar Delia radicum (L.). The conditionally registered M. anisopliae isolate (F52) performed best killing an average of 85 and 72% of D. radicum larvae at the high and low concentration, respectively. The mean LC50 and LC95 of F52 against second instar D. radicum was 2.7 x 106 …

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Involvement Of Acetosyringone In Plant–Pathogen Recognition, C. Jacyn Baker, Norton M. Mock, Bruce D. Whitaker, Daniel P. Roberts, Clifford P. Rice, Kenneth L. Deahl, Andrey A. Aver'yanov Jan 2005

Involvement Of Acetosyringone In Plant–Pathogen Recognition, C. Jacyn Baker, Norton M. Mock, Bruce D. Whitaker, Daniel P. Roberts, Clifford P. Rice, Kenneth L. Deahl, Andrey A. Aver'yanov

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

In this study, acetosyringone was identified as one of the major extracellular phenolics in tobacco suspension cells and was shown to have bioactive properties that influence early events in plant–bacterial pathogenesis. In our model system, tobacco cell suspensions treated with bacterial isolate Pseudomonas syringae WT (HR+) undergo a resistant interaction characterized by a burst in oxygen uptake several hours after inoculation. When the extracellular concentration of acetosyringone in tobacco cell suspensions was supplemented with exogenous acetosyringone, the burst in oxygen uptake occurred as much as 1.5 h earlier. The exogenous acetosyringone had no effect on tobacco suspensions undergoing susceptible interactions …

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Field Assessment Of The Risk Posed By Diorhabda Elongata, A Biocontrol Agent For Control Of Saltcedar (Tamarix Spp.), To A Nontarget Plant, Frankenia Salina, Tom L. Dudley, David J. Kazmer Jan 2005

Field Assessment Of The Risk Posed By Diorhabda Elongata, A Biocontrol Agent For Control Of Saltcedar (Tamarix Spp.), To A Nontarget Plant, Frankenia Salina, Tom L. Dudley, David J. Kazmer

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The biological control program for saltcedar (Tamarix spp.) has led to open releases of a specialist beetle (Chrysomelidae: Diorhabda elongata) in several research locations, but the controversy over potential impacts to native, nontarget plants of the genus Frankenia remains unresolved. To assess the potential for nontarget impacts under Weld conditions, we installed cultivated Frankenia spp. (primarily two forms of Frankenia salina but also including Frankenia jamesii) at locations in Nevada and Wyoming where D. elongata densities and saltcedar defoliation were expected to be very high, so insects would be near starvation with high probability of attacking nontargets …

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Effect Of Control Plot Density, Control Plot Arrangement, And Assumption Of Random Or Fixed Effects On Nonreplicated Experiments For Germplasm Screening Using Spatial Models, Boi Sebolai, Jeffrey F. Pedersen, D. B. Marx, D. L. Boykin Jan 2005

Effect Of Control Plot Density, Control Plot Arrangement, And Assumption Of Random Or Fixed Effects On Nonreplicated Experiments For Germplasm Screening Using Spatial Models, Boi Sebolai, Jeffrey F. Pedersen, D. B. Marx, D. L. Boykin

Department of Agronomy and Horticulture: Faculty Publications

Early generation selection experiments typically involve several hundred to thousands of lines. Various systematic and statistical techniques have been developed to increase effectiveness and efficiencies in such experiments, including the development and application of spatial statistical models. In this study, mixed model equations were used to provide least squares means (LSMEANs) and best linear unbiased predictors (BLUPs) and compare selection effectiveness and efficiencies to observed (Y) and true values in simulated experiments varying in size (10 X 10, 20 X 20 and 30 X 30 grids), control plots densities (0, 5, 10, 20, and 50%), control plot arrangements (high, medium, …

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Science-Based Organic Farming 2005: Toward Local And Secure Food Systems, Charles A. Francis, Twyla Hansen, Peter Skelton Jan 2005

Science-Based Organic Farming 2005: Toward Local And Secure Food Systems, Charles A. Francis, Twyla Hansen, Peter Skelton

Publications from the Center for Applied Rural Innovation (CARI)

Organic farming includes growing food and fiber — animals, agronomic crops, horticultural fruits and vegetables, related products — as one dynamic and rapidly evolving component of our complex U.S. food system. Even as more farmers are moving toward organic certification and participation in an environmentally sound and economically lucrative market, questions arise about the long-term social impacts and sustainability of a set of practices that has gone from a movement to an industry. Consolidations in the organic trade have brought multinational corporations to the table, as they have observed a grassroots activity that has grown by 20% per year for …

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Jalapeño Pepper Cultivar Evaluation, Northern Indiana, 2005, Elizabeth T. Maynard Jan 2005

Jalapeño Pepper Cultivar Evaluation, Northern Indiana, 2005, Elizabeth T. Maynard

Midwest Vegetable Trial Reports

The USDA Agriculture Census for 2002 reported 355 acres of chile peppers, including jalapeños, grown in Indiana. Almost half of the reported acreage is in Lake Co. Based on conversations with Indiana producers, market criteria for jalapeños differ greatly depending on the ultimate consumer. Many major wholesale buyers prefer large peppers with no checking, or cracks. Markets strongly influenced by people of Mexican heritage prefer large, hot, peppers that are cracked when mature. Anthocyanin development is undesirable in both markets. Producers look for varieties that yield large quantities of high quality peppers, and are easily harvested. This paper reports on …

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Evaluation Of Pumpkin Cultivars No-Till Direct-Seeded And No-Till Transplanted Into Wheat Stubble, Indiana 2004, Elizabeth T. Maynard Jan 2005

Evaluation Of Pumpkin Cultivars No-Till Direct-Seeded And No-Till Transplanted Into Wheat Stubble, Indiana 2004, Elizabeth T. Maynard

Midwest Vegetable Trial Reports

Double-cropping pumpkins after wheat provides an opportunity to harvest a high-value crop off of land that might otherwise remain uncropped. In northern Indiana, many jacko- lantern pumpkin cultivars may not mature quickly enough to produce a crop when planted in mid-July. This project compared yield and fruit size of eight cultivars or lines when they were either direct-seeded or transplanted into wheat stubble.

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Bell Pepper Cultivar Evaluation, Northern Indiana, 2005, Elizabeth T. Maynard Jan 2005

Bell Pepper Cultivar Evaluation, Northern Indiana, 2005, Elizabeth T. Maynard

Midwest Vegetable Trial Reports

The USDA Agriculture Census for 2002 reported 225 acres of bell peppers grown in Indiana. Production is scattered across the state, with greater concentrations of farms in northern counties. Wholesale prices are highest for large, blocky peppers. Eight bell pepper cultivars were evaluated at the Pinney-Purdue Ag Center in Wanatah, Indiana. Characteristics of interest included yield, and fruit quality, size and shape.

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Jalapeño Pepper Cultivar Evaluation, Northern Indiana, 2004, Elizabeth T. Maynard Jan 2005

Jalapeño Pepper Cultivar Evaluation, Northern Indiana, 2004, Elizabeth T. Maynard

Midwest Vegetable Trial Reports

This paper reports on twelve jalapeño pepper cultivars were evaluated at the Pinney-Purdue Ag Center in Wanatah, Indiana. Characteristics of interest included yield, and fruit size and shape, wall thickness, and plant size.

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Fresh Market Tomato Cultivar Evaluation For Northern Indiana, 2004, Elizabeth T. Maynard Jan 2005

Fresh Market Tomato Cultivar Evaluation For Northern Indiana, 2004, Elizabeth T. Maynard

Midwest Vegetable Trial Reports

This paper reports on twelve fresh market tomato varieties that were evaluated in a replicated trial at the Pinney-Purdue Agricultural Center in Wanatah, Indiana, and six varieties that were observed in unreplicated plots. Characteristics of interest include marketable and total yield and average fruit size.

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Perennial Grasses - Are They For Me? Workshop Manual For Participants, Department Of Agriculture And Food, Wa, Grains Research And Development Corporation Jan 2005

Perennial Grasses - Are They For Me? Workshop Manual For Participants, Department Of Agriculture And Food, Wa, Grains Research And Development Corporation

Agriculture reports

This workshop is part of a series of workshops looking at dryland salinity and options to manage it. These ‘Million hectares’ workshops have the common themes of environmental improvement. They provide information to help participants identify the risks within the catchment and at a farm level, assess both the likelihood of the risk occurring and consequences if the risk is not managed and determine the best course of action for individuals. This perennial grass workshop builds on information and understanding developed from other Million hectares workshops. Participants will determine their course of action based on their specific circumstances and goals. …

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An Inventory Of Rangelands In Part Of The Broome Shire, Western Australia, W E. Cotching Jan 2005

An Inventory Of Rangelands In Part Of The Broome Shire, Western Australia, W E. Cotching

Technical Bulletins

The inventory of rangelands in part of the Broome Shire in Western Australia was undertaken by DAFWA between 1989 and 1990. It describes and maps the natural resources of the region’s pastoral leasehold land. This survey report provides a baseline record of the existence and condition of the natural area’s resources, to assist with the planning and implementation of land management practices. The report identified and described the condition of soils, landforms, vegetation, habitat, ecosystems, and declared plants and animals. It also assessed the impact of pastoralism and made land management recommendations. The survey of part of the Broome Shire …

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Bacterial Soft Rot Of Aloe Caused By Pectobacterium Chrysanthemi: A New Report From India, Kunal Mandal Dec 2004

Bacterial Soft Rot Of Aloe Caused By Pectobacterium Chrysanthemi: A New Report From India, Kunal Mandal

Kunal Mandal

A new leaf rot disease of Aloe barbadensis was reported for the first time in India.

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