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- Competition (2)
- agronomic and quality effects (1)
- Abutilon theophrasti (1)
- Bioeconomic model (1)
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- Blanket flower (Gaillardia aristata) (1)
- Cantaloupe (1)
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- Environmental quality; Landscape position; Nitri®cation; Acidi®cation; Microbial activity; Indicators; Physical properties (1)
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- Greenbug resistance (1)
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- Imazapic (1)
- Imazaquin (1)
- Imazethapyr (1)
- Integrated weed management (1)
- LI-COR LAI-2000 (1)
- Leaf K concentration (1)
- Leaf N concentration (1)
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- Leaf area (1)
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Articles 1 - 17 of 17
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Post–Green Revolution Trends In Yield Potential Of Temperate Maize In The North-Central United States, D. N. Duvick, Kenneth G. Cassman
Post–Green Revolution Trends In Yield Potential Of Temperate Maize In The North-Central United States, D. N. Duvick, Kenneth G. Cassman
Department of Agronomy and Horticulture: Faculty Publications
This paper addresses the question of whether there has been an increase in yield potential of maize (Zea mays L.) hybrids released in the north-central United States since the advent of the “Green Revolution” that began in the late 1960s. Because there are few published data about hybrid growth rates and yield-determining plant traits when grown at yield potential levels, we attempt to address this issue indirectly by evaluation of maize breeding efforts, changes in plant traits of commercial hybrids, and by comparison of statewide average yield trends and yield trends in sanctioned yield contests. On the basis of …
Yield Potential Trends Of Tropical Rice Since The Release Of Ir8 And The Challenge Of Increasing Rice Yield Potential, S. Peng, Kenneth G. Cassman, S. S. Virmani, J. Sheehy, G. S. Khush
Yield Potential Trends Of Tropical Rice Since The Release Of Ir8 And The Challenge Of Increasing Rice Yield Potential, S. Peng, Kenneth G. Cassman, S. S. Virmani, J. Sheehy, G. S. Khush
Department of Agronomy and Horticulture: Faculty Publications
Since the release of IR8 in 1966, 42 additional indica rice (Oryza sativa L.) cultivars developed by the International Rice Research Institute (IRRI) for the irrigated and favorable rainfed lowlands have been released in the Philippines. The maximum yield of IR8 has been reduced by about 2 Mg ha-1 during the past 30 yr. Empirical breeding for population improvement within the indica germplasm has in the maintenance of rice yield potential in the tropics of about 10 Mg ha-1. To break the yield barrier, several approaches are being explored. These include development of a new plant …
An Integrated Genetic Linkage Map Of The Soybean Genome, P.B. Cregan, T. Jarvik, A.L. Bush, R.C. Shoemaker, K.G. Lark, A.L. Kahler, N. Kaya, T.T. Vantoai, D.G. Lohnes, J. Chung, James E. Specht
An Integrated Genetic Linkage Map Of The Soybean Genome, P.B. Cregan, T. Jarvik, A.L. Bush, R.C. Shoemaker, K.G. Lark, A.L. Kahler, N. Kaya, T.T. Vantoai, D.G. Lohnes, J. Chung, James E. Specht
Department of Agronomy and Horticulture: Faculty Publications
A number of molecular genetic maps of the soybean [Glycine max (L.) Merr.] have been developed over the past 10 yr. These maps are primarily based on restriction fragment length polymorphism (RFLP) markers. Parental surveys have shown that most RFLP loci have only two known alleles. However, because the soybean is an ancient polyploid, RFLP probes typically hybridize and map to more than one position in the genome. Thus, the polymorphic potential of an RFLP probe is primarily a function of the frequency of the two alleles at each locus the probe detects. In contrast, simple sequence repeat (SSR) …
Canopy Analysis As A Technique To Characterize Defoliation Intensity On Sandhills Range, M. S. Miller-Goodman, Lowell E. Moser, Steven S. Waller, J. E. Brummer, P. E. Reece
Canopy Analysis As A Technique To Characterize Defoliation Intensity On Sandhills Range, M. S. Miller-Goodman, Lowell E. Moser, Steven S. Waller, J. E. Brummer, P. E. Reece
Department of Agronomy and Horticulture: Faculty Publications
Characterization of relationships between grazing and vegetation responses is difficult. Rapid and accurate measurement of pasture canopy characteristics would help clarify these relationships if canopy changes are directly related to grazing variables. The objectives of this study were (1) to evaluate use of the LI-COR LAI-2000 for quantification of changes in canopy density and architecture in response to defoliation by cattle, (2) to determine if changes in leaf area index (LAI) measured with the LAI-2000 are related to stocking rate, and (3) to determine advantages and drawbacks of the LAI-2000 for monitoring grazing impacts on canopy density and architecture. Leaf …
Ecological Intensification Of Cereal Production Systems: Yield Potential, Soil Quality, And Precision Agriculture, Kenneth G. Cassman
Ecological Intensification Of Cereal Production Systems: Yield Potential, Soil Quality, And Precision Agriculture, Kenneth G. Cassman
Department of Agronomy and Horticulture: Faculty Publications
Wheat (Triticum aestivum L.), rice (Oryza sativa L.), and maize (Zea mays L.) provide about two-thirds of all energy in human diets, and four major cropping systems in which these cereals are grown represent the foundation of human food supply. Yield per unit time and land has increased markedly during the past 30 years in these systems, a result of intensified crop management involving improved germplasm, greater inputs of fertilizer, production of two or more crops per year on the same piece of land, and irrigation. Meeting future food demand while minimizing expansion of cultivated area primarily …
Field And Laboratory Evaluation Of Soil Quality Changes Resulting From Injection Of Liquid Sewage Sludge, S. Stamatiadis, John W. Doran, Timothy A. Kettler
Field And Laboratory Evaluation Of Soil Quality Changes Resulting From Injection Of Liquid Sewage Sludge, S. Stamatiadis, John W. Doran, Timothy A. Kettler
Department of Agronomy and Horticulture: Faculty Publications
Soil quality changes resulting from repeated or single injection of liquid municipal sewage sludge were evaluated in terraced cropland in eastern Nebraska, USA. Differences in soil properties among sampling locations were explained primarily by two factors, landscape position and sludge injection. Selected chemical properties (pH, EC, NO 3-N) did not generally differ between landscape positions, but soil organic matter (organic C and N) and microbial activity indices (soil respiration, biomass N, available N, mineralization and nitrification rates) were more sensitive indicators of change. Values of these indicators generally increased down-slope from the upper terrace to the grassed waterway on …
Genetic\ Agronomic And Quality Comparisons Of Two 1al.1rs. Wheat-Rye Chromosomal Translocations, Robert A. Graybosch, J.-H. Lee, C. J. Peterson, D. R. Porter, O. K. Chung
Genetic\ Agronomic And Quality Comparisons Of Two 1al.1rs. Wheat-Rye Chromosomal Translocations, Robert A. Graybosch, J.-H. Lee, C. J. Peterson, D. R. Porter, O. K. Chung
Department of Agronomy and Horticulture: Faculty Publications
The 1AL.1RS wheat-rye chromosomal translocation originally found in ‘Amigo’ wheat possesses resistance genes for stem rust, powdery mildew and greenbug biotypes B and C, but also has a negative effect on wheat processing quality. Recently, a second 1AL.1RS translocation carrying Gb6 a gene conferring resistance to greenbug biotypes B, C, E, G and I, was identified in the wheat germplasm line ‘GRS1290’. Protein analytical methods, and the DNA polymerase chain reaction were used to identify markers capable of differentiating the 1RS chromosome arms derived from ‘Amigo’ and ‘GRS1201’. The secalin proteins encoded by genes on 1RS chromosome arms differed in …
Switchgrass Seedling Development As Affected By Seed Size, Alexander J. Smart, Lowell E. Moser
Switchgrass Seedling Development As Affected By Seed Size, Alexander J. Smart, Lowell E. Moser
Department of Agronomy and Horticulture: Faculty Publications
Seed size has been associated with early seedling vigor (i.e., germination rate, emergence rate, and growth) in grasses. This study was conducted to compare seedling development over a 60-d period in the field as affected by heavy seed (HS) (0.19 to 0.21 g 100 seed-1) and light seed (LS) (0.13 to 0.16 g 100 seed-1) of 'Blackwell' and 'Trailblazer' switchgrass (Panicum virgatum L.). The experiment was conducted in 1995 and 1996 at Lincoln, NE, on a Kennebec silt loam (fine-silty, mixed, superactive, mesic Cumnlic Hapludolls). The experimental design was a randomized complete block with four …
Notes: Evaluation Of A Filter Bag System For Ndf, Adf, And Ivdmd Forage Analysis, Kenneth P. Vogel, Jeffrey F. Pedersen, Steven D. Masterson, John J. Toy
Notes: Evaluation Of A Filter Bag System For Ndf, Adf, And Ivdmd Forage Analysis, Kenneth P. Vogel, Jeffrey F. Pedersen, Steven D. Masterson, John J. Toy
Department of Agronomy and Horticulture: Faculty Publications
A new method of determining in vitro dry matter digestibility (IVDMD) as recently developed in which the digestion is conducted with the forage samples in filter bags. Our objective was to compare the filter bag and conventional IVDMD analysis methods using smooth bromegrass (Bromus inermis Leyss.), switchgrass (Panicum virgatum L.), and forage sorghum [Sorghum bicolor (L.) Moench] samples. In addition, the filter bag analysis systems for determining non-sequential neutral and acid detergent fiber (NDF and ADF), respectively, were compared with the non-sequential conventional analysis systems. In the filter bag systems, the forage samples are sealed in filter bags and the …
Measurement Of Sorghum Stalk Strength Using The Missouri-Modified Electronic Rind Penetrometer, Jeffrey F. Pedersen, J. J. Toy
Measurement Of Sorghum Stalk Strength Using The Missouri-Modified Electronic Rind Penetrometer, Jeffrey F. Pedersen, J. J. Toy
Department of Agronomy and Horticulture: Faculty Publications
Resistance to lodging is critical in sorghum [Sorghum bicolor (L.) Moench] grown for grain, yet adequate tools for plant breeders to assess this character at or before anthesis have not been developed. The objective of this study was to evaluate whether an electronic penetrometer previously shown to be an effective tool for measuring stalk strength in maize (Zea mays L.) could be usedd to differentiate among grain sorghum hybrids. Entries in three commercial grain sorghum hybrid trials were evaluated for rind penetrometer resistance (RPR) of the peduncle, the lower stalk anthesis and the lower stalk at maturity. Actual …
Ecophysiological Characteristics Of Four Maize Hybrids And Abutilon Theophrasti, John L. Lindquist, David A. Mortensen
Ecophysiological Characteristics Of Four Maize Hybrids And Abutilon Theophrasti, John L. Lindquist, David A. Mortensen
Department of Agronomy and Horticulture: Faculty Publications
Combining empirical research with simulation modeling may improve our understanding of the dynamics of crop:weed competition and for testing hypotheses on the importance of specific traits for enhancing crop performance in mixtures. Two field experiments were conducted to quantify and compare estimates of traits important for radiation interception and utilization in four maize hybrids and Abutilon theophrasti grown in monoculture. Early leaf area growth rate did not vary among maize hybrids within a year, but varied among years. The response of CO2 assimilation rate to absorbed radiation and leaf nitrogen content did not differ among hybrids. Abutilon theophrasti and …
Stability Of Corn (Zea Mays)- Foxtail (Setaria Spp.) Interference Relationships, John L. Lindquist, David A. Mortensen, Philip Westra, W. J. Lambert, Thomas T. Bauman, Jason Fausey, James Kells, Steven Langton, R. Gordon Harvey, Brett H. Bussler, Kevin Banken, Sharon Clay, Frank Forcella
Stability Of Corn (Zea Mays)- Foxtail (Setaria Spp.) Interference Relationships, John L. Lindquist, David A. Mortensen, Philip Westra, W. J. Lambert, Thomas T. Bauman, Jason Fausey, James Kells, Steven Langton, R. Gordon Harvey, Brett H. Bussler, Kevin Banken, Sharon Clay, Frank Forcella
Department of Agronomy and Horticulture: Faculty Publications
Variation in interference relationships have been shown for a number of crop-weed associations and may have an important effect on the implementation of decision support systems for weed management. Multiyear field experiments were conducted at eight locations to determine the stability of corn-foxtail interference relationships across years and locations. Two coefficients (I and A) of a rectangular hyperbola equation were estimated for each data set using nonlinear regression procedures. The I and A coefficients represent percent corn yield loss as foxtail density approaches zero and maximum percent corn yield loss, respectively. The coefficient I was stable across years …
Native Wildflower Establishment With Imidazolinone Herbicides, Daniel D. Beran, Roch E. Gaussoin, Robert A. Masters
Native Wildflower Establishment With Imidazolinone Herbicides, Daniel D. Beran, Roch E. Gaussoin, Robert A. Masters
Department of Agronomy and Horticulture: Faculty Publications
Native wildflowers are important components of grassland communities and low-maintenance wildflower seed mixtures. Weed interference limits successful establishment of native wildflowers from seed. Experiments were conducted to determine the influence of the imidazolinone herbicides imazethapyr, imazapic, and imazaquin on the establishment of blackeyed susan (Rudbeckia hirta L.), upright prairieconeflower [Ratibida columnifera (Nutt) Woot. and Standl.], spiked liatris [Liatris spicata (L.) Willd.], blanket flower (Gaillardia aristata Pursh.), purple coneflower [Echinacea purpurea (L.) Moench.], and spotted beebalm (Monarda punctata L.). Wildflower response to the herbicide treatments was variable and appeared to be influenced by the level …
Effect Of Leaf Phosphorus And Potassium Concentration On Chlorophyll Meter Reading In Rice, Shaobing Peng, Arnel L. Sanico, Felipe V. Garcia, Rebecca C. Laza, Romeo M. Visperas, Josue P. Descalsota, Kenneth G. Cassman
Effect Of Leaf Phosphorus And Potassium Concentration On Chlorophyll Meter Reading In Rice, Shaobing Peng, Arnel L. Sanico, Felipe V. Garcia, Rebecca C. Laza, Romeo M. Visperas, Josue P. Descalsota, Kenneth G. Cassman
Department of Agronomy and Horticulture: Faculty Publications
Chlorophyll meter (SPAD) is a convenient tool to estimate leaf nitrogen (N) concentration of rice plants. There is no information on the effects of leaf phosphorus (P) and potassium (K) concentration on SP AD readings and on the relationship between SPAD values and leaf N concentration in the literature. In 1996 dry season, cv IR72 was grown at the International Rice Research Institute (IRRI) and the Philippine Rice Research Institute (PhilRice) under various N, P and K fertilizer combinations. SPAD measurements were made on the topmost fully expanded leaves at mid-tillering and panicle initiation. The leaves were then detached, dried …
A Review Of Issues Pertaining To Transgenic Turfgrasses, Paul G. Johnson, Terrance P. Riordan
A Review Of Issues Pertaining To Transgenic Turfgrasses, Paul G. Johnson, Terrance P. Riordan
Department of Agronomy and Horticulture: Faculty Publications
Recombinant DNA technology is a rapidly growing field in plant and animal breeding. This technology involves the transfer of pieces of DNA, or genes, regardless of the organisms involved or how they are related. Transformation procedures in plants were first developed for important crop and model plant systems. Although turfgrass management and production is one of the fastest growing areas of agriculture, genetic transformation of turfgrasses lags behind that of many other important crop plants. Turfgrasses are becoming more important primarily because of their association with the ever-increasing urban population. The size of the turfgrass seed market is second only …
Loci Controlling Resistance To High Plains Virus And Wheat Streak Mosaic Virus In A B73 × Mo17 Population Of Maize, A. Marçon, S. M. Kaeppler, S. G. Jensen, L. Senior, C. Stuber
Loci Controlling Resistance To High Plains Virus And Wheat Streak Mosaic Virus In A B73 × Mo17 Population Of Maize, A. Marçon, S. M. Kaeppler, S. G. Jensen, L. Senior, C. Stuber
Department of Agronomy and Horticulture: Faculty Publications
High Plains disease has the potential to cause significant yield loss in susceptible corn (Zea mays L.) and wheat (Triticum aestivum L.) genotypes, especially in the central and western USA. The primary causal agent, High Plains virus (HPV), is vectored by wheat curl mite (WCM; Aceria tossicheila Keifer), which is also the vector of wheat streak mosaic virus (WSMV). In general, the two diseases occur together as a mixed infection in the field. The objective of this research was to characterize the inheritance of HPV and WSMV resistance using B73 (resistant to HPV and WSMV) × Mo17 (moderately …
The Response Of Muskmelon Growth And Development To Microclimate Modification By Shelterbelts, Dongsheng Zheng, James R. Brandle, Laurie Hodges, Entin Daningsih, Kenneth G. Hubbard
The Response Of Muskmelon Growth And Development To Microclimate Modification By Shelterbelts, Dongsheng Zheng, James R. Brandle, Laurie Hodges, Entin Daningsih, Kenneth G. Hubbard
Department of Agronomy and Horticulture: Faculty Publications
The relationships between shelterbelt (tree windbreak)-induced microclimate and muskmelon (Cucumis melo L.) growth and development were investigated at the Univ. of Nebraska-Lincoln Agricultural Research and Development Center near Mead, Nebr., during the 1992 and 1993 growing seasons. Wind speed, wind direction, air and soil temperatures, relative humidity, and soil moisture were monitored in both sheltered and nonsheltered areas. Plant growth parameters (plant height, vine length, plant dry weight, and leaf area) were measured at various stages of development. Shelterbelts provided improved growing conditions for muskmelon transplants. Direct wind damage and duration of higher wind speeds were reduced 47% to …