Open Access. Powered by Scholars. Published by Universities.®
- Keyword
Articles 1 - 17 of 17
Full-Text Articles in Plant Sciences
Characterization Of Fro1, A Pea Ferric-Chelate Reductase Involved In Root Iron Acquisition, Brian M. Waters, Dale G. Blevins, David J. Eide
Characterization Of Fro1, A Pea Ferric-Chelate Reductase Involved In Root Iron Acquisition, Brian M. Waters, Dale G. Blevins, David J. Eide
Department of Agronomy and Horticulture: Faculty Publications
To acquire iron, many plant species reduce soil Fe(III) to Fe(II) by Fe(III)-chelate reductases embedded in the plasma membrane of root epidermal cells. The reduced product is then taken up by Fe(II) transporter proteins. These activities are induced under Fe deficiency. We describe here the FRO1 gene from pea (Pisum sativum), which encodes an Fe(III)-chelate reductase. Consistent with this proposed role, FRO1 shows similarity to other oxidoreductase proteins, and expression of FRO1 in yeast conferred increased Fe(III)-chelate reductase activity. Furthermore, FRO1 mRNA levels in plants correlated with Fe(III)-chelate reductase activity. Sites of FRO1 …
Accumulation Of Microbial Biomass Within Particulate Organic Matter Of Aging Golf Greens, Mine Kerek, Rhae A. Drijber, William L. Powers, Robert C. Shearman, Roch E. Gaussoin, Anne Streich
Accumulation Of Microbial Biomass Within Particulate Organic Matter Of Aging Golf Greens, Mine Kerek, Rhae A. Drijber, William L. Powers, Robert C. Shearman, Roch E. Gaussoin, Anne Streich
Department of Agronomy and Horticulture: Faculty Publications
Microbial biomass (MB) is a key variable controlling soil organic matter dynamics in soil. Currently, there is little information on the amount and significance of MB in highly managed golf greens. Our objective was to determine the amount and distribution of MB within soil structural components of golf greens and its relationship to the location of organic substrates. During 1996, 47 greens were sampled from 12 golf courses within Nebraska (USA). Microbial biomass, determined as extractable lipid phosphate on field-moist soils, increased linearly with age of green (Y = 19.39 + 3.54x; r2 = 0.87, P = 0.001). In …
Atelier Ouest - Africain Sur Les Semences Bybrides De Sorgbo Et De Mil, John D. Axtell, Moussa Oumarou, Issoufou Kapran, Anand Kumar, Ouendeba Botorou, Gebisa Ejeta, Lee House, Thomas Crawford, Bruce Hamaker, Inoussa Akintayo
Atelier Ouest - Africain Sur Les Semences Bybrides De Sorgbo Et De Mil, John D. Axtell, Moussa Oumarou, Issoufou Kapran, Anand Kumar, Ouendeba Botorou, Gebisa Ejeta, Lee House, Thomas Crawford, Bruce Hamaker, Inoussa Akintayo
INTSORMIL Impacts and Bulletins
Le sorgho et Ie mil sont les deux cereales les plus importantes en Afrique Occidentale. Elles y representent en effet 70 % de la production cerealiere totale qui constitue la ration de base des peuples vivant dans cette region. Les progres realises dans I' amelioration du sorgho et du mil sont par consequent d'une importance vitale pour Ie bien-etre des populations de l' Afrique Occidentale. L' atelier de travail sur la semence hybride de sorgho et de mil represente l'aboutissement de 10 annees d'efforts de recherche et de developpement par l'Institut National de Recherches Agronomiques du Niger (INRAN), Ie Programme …
Proceedings Of The West African Hybrid Sorghum And Pearl Millet Seed Workshop, John D. Axtell, Moussa Oumarou, Issoufou Kapran, Anand Kumar, Ouendeba Botorou, Gebisa Ejeta, Lee House, Thomas Crawford, Bruce Hamaker,, Inoussa Akintayo
Proceedings Of The West African Hybrid Sorghum And Pearl Millet Seed Workshop, John D. Axtell, Moussa Oumarou, Issoufou Kapran, Anand Kumar, Ouendeba Botorou, Gebisa Ejeta, Lee House, Thomas Crawford, Bruce Hamaker,, Inoussa Akintayo
INTSORMIL Impacts and Bulletins
Sorghum and pearl millet are the most important cereal crops in West Africa where they provide 70% of total cereal production that provide the major complements in the diets of people in the region. Research progress in the improvement of sorghum and millet is, therefore, of vital importance to the well being of people in West Africa. The Hybrid Sorghum and Pearl Millet Seed Workshop in West Africa is the culmination of the research and development effort by the Institut National de Recherches Agronomiques du Niger (INRAN) , the International Sorghum and Millet Collaborative Research Support Program (INTSORMIL), and the …
Intsormil 2002 Annual Report, John M. Yohe, Thomas Crawford Jr., Kimberly Jones, Dorothy Stoner
Intsormil 2002 Annual Report, John M. Yohe, Thomas Crawford Jr., Kimberly Jones, Dorothy Stoner
INTSORMIL Impacts and Bulletins
The global community confronts an enonnous task of stimulating economic growth in rural areas where 75% of the very poor (90% in Africa) currently live and ensuring the nutritional security of a world popUlation that is growing in size and evolving in consumption patterns without intensifying environmental degradation, social security, or adverse consequences for human health. This challenge is not only great but it is also urgent. Today, access to food, sufficient, safe, and nutritious food, is the primary problem for nearly 800 million chronically undernourished people. Unless we act now, the next few decades will almost certainly find us …
Response Of Lowland Rice Plants To Simulated Insect Defoliation In West Africa, I. O. Oyediran, E. A. Heinrichs
Response Of Lowland Rice Plants To Simulated Insect Defoliation In West Africa, I. O. Oyediran, E. A. Heinrichs
Department of Entomology: Faculty Publications
Field experiments were conducted to investigate the impact of simulated insect-caused defoliation on irrigated rice. Defoliation levels tested were 0% (control), 25% defoliation at 21 days after transplanting (dat), 25% defoliation at 41 dat, 25% defoliation at 21 and 42 dat, 50% defoliation at 21 dat, 50% defoliation at 42 dat, 75% defoliation at 21 dat, 75% defoliation at 42 dat, 75% defoliation at 21 and 42 dat, 100% defoliation at 21 dat, and 100% defoliation at 21 and 42 dat. Tiller height, total number of tillers, percent panicle-bearing tillers, weight of 100 grains, and grain yields were recorded. The …
Manure Matters, Volume 8, Number 1, Bahman Eghball, John Gilley
Manure Matters, Volume 8, Number 1, Bahman Eghball, John Gilley
Manure Matters (newsletter)
Phosphorus Risk Assessment Index Evaluation Using Runoff Measurements
Published by University of Nebraska – Lincoln’s Livestock Environmental Issues Committee. Manure and composted manure are valuable and renewable resources that can be effectively utilized for crop production and soil improvement. However, runoff from cropland areas receiving manure or compost may contribute to increased phosphorus (P) in streams and lakes. The main factors controlling P movement in surface runoff are transport (runoff and erosion) and source factors such as manure or fertilizer application method and rate, and soil P test level. Elevated soil P levels may result from application of manure at …
Manure Matters, Volume 8, Number 2, Christopher G. Henry, Dennis D. Schulte
Manure Matters, Volume 8, Number 2, Christopher G. Henry, Dennis D. Schulte
Manure Matters (newsletter)
Assessing Odor Risk
Odors from animal production operations are a major concern in rural communities. Pressure from the public and the potential impact on the rural economy has caused strong emotional conflicts. Currently livestock producers and urban planning officials have few tools to objectively evaluate scientifically based setbacks between livestock operations and residential areas. Conversely, livestock producers have few tools available to them to demonstrate how odor control technologies can reduce the risk potential of odor incidents.
Recognizing this concern in Minnesota, the Minnesota Legislature provided funds to their University to develop a tool to help predict offsite odor movement …
Manure Matters, Volume 8, Number 3, Charles S. Wortmann
Manure Matters, Volume 8, Number 3, Charles S. Wortmann
Manure Matters (newsletter)
How much can you pay to have manure applied to your land?
Livestock feeders often need more land for manure application to avoid excessive buildup of soil phosphorus. In some cases, they request payment to reduce transport costs. When is manure a good buy for crop production?
Manure supplies the full complement of nutrients needed by crops and often helps to improve soil biological and physical properties such as the rate of water infiltration. Because of these soil improvements, crop yield is often more with manure application than with fertilizers.
One way of estimating the value of manure is to …
Manure Matters, Volume 8, Number 4, Michael Brumm, Charles A. Shapiro, William Kranz
Manure Matters, Volume 8, Number 4, Michael Brumm, Charles A. Shapiro, William Kranz
Manure Matters (newsletter)
Nitrate contamination of groundwater was first detected in Holt County, Nebraska in the mid- 1960’s. From 1976 to 1990, nitrate-N concentrations increased in 90 percent of the wells sampled by the Natural Resource Districts (NRD) in the county. As a consequence of the concerns associated with this increase, the Holt County Manure Management Education Project was funded by an EPA-319 grant with cooperation among UNL Cooperative Extension, UNL Conservation and Survey Division, USDA-NRCS, the Lower Niobrara NRD, and the Upper Elkhorn NRD. The goal of the project was to educate producers on cropping and manure best management practices to protect …
Manure Matters, Volume 8, Number 8, Richard R. Stowell, Christopher G. Henry
Manure Matters, Volume 8, Number 8, Richard R. Stowell, Christopher G. Henry
Manure Matters (newsletter)
The Economic Potential of Methane Recovery for Swine Operations: Projected Impacts of Various Public-Policy Scenarios
Economic analyses were performed on anaerobic digestion of manure from finishing operations. The main factors considered were herd size (1,000 head; 3,500 head; and 10,000 head) and method of financial support provided (cost-share program, no-interest loans, tax subsidies, and subsidized electrical sales).
Installation of a digester system is a significant investment that is currently very difficult to justify economically to Nebraska producers based upon consideration of readily quantifiable income and expenses, regardless of farm size. Swine finishing operations looking to invest in this technology would …
Manure Matters, Volume 8, Number 6
Manure Matters, Volume 8, Number 6
Manure Matters (newsletter)
Comprehensive Nutrient Management Planning
‘Tools’ for growing season nitrogen management. The pre-sidedress nitrate test, the chlorophyll meter, and the corn stalk nitrate test are three ‘tools’ that are available to farmers and their advisors to improve nitrogen management, both environmentally and economically. To help participants in the 2001 CNMP program become familiar with these tests, we helped them conduct these tests on their manured fields. Most of the manure had been applied without calibrating the spreader or testing the manure.
Manure Matters, Volume 8, Number 5, Charles A. Shapiro, Charles S. Wortmann, Richard Deloughery
Manure Matters, Volume 8, Number 5, Charles A. Shapiro, Charles S. Wortmann, Richard Deloughery
Manure Matters (newsletter)
Manure testing: what to request?
Manure testing is necessary to make optimum use of manure while protecting water resources. The Manure Sample Submission Form requests information required for reliable interpretation of the results.
Manure Matters, Volume 8, Number 9, Richard Deloughery, Marty Link
Manure Matters, Volume 8, Number 9, Richard Deloughery, Marty Link
Manure Matters (newsletter)
Interpreting Test Reports of Ground Water Monitoring Wells at Livestock Waste Control Facilities
Some livestock waste control facilities that are required to have an operating permit by the Nebraska Department of Environmental Quality (NDEQ) are also required to install ground water monitoring wells adjacent to the waste control facility. Ground water monitoring requirements are decided on site-specific considerations. Generally, ground water monitoring may be required where the depth to water is shallow, sediments are sandy, the livestock facility is located in a public water supply’s Wellhead Protection Area, or any combination of these and other factors listed in Chapter 13 …
Manure Matters, Volume 8, Number 7, J. David Aiken
Manure Matters, Volume 8, Number 7, J. David Aiken
Manure Matters (newsletter)
Property Valuation May Be Reduced by Proximity to Livestock Operation
In Nebraska, land and buildings are valued at their fair market value for purposes of property taxation. Residential and commercial real estate is valued at 92-100% of actual value (i.e. farm market value) and agricultural real estate is valued at 74-80% of actual value. NRS 77- 5023(3). Fair market value for property tax valuation purposes may be determined by (1) comparative sales, (2) income or (3) cost. NRS 77-112. In Livingston v Jefferson County Board of Equalization, 10 Neb App 934 (2002), the Nebraska Court of Appeals ruled that …
Genetic Analysis Of Feed Quality And Seed Weight Of Sorghum Inbred Lines And Hybrids Using Analytical Methods And Nirs, C. Hicks, M. R. Tuinstra, Jeffrey F. Pedersen, F. E. Dowell, K. D. Kofoid
Genetic Analysis Of Feed Quality And Seed Weight Of Sorghum Inbred Lines And Hybrids Using Analytical Methods And Nirs, C. Hicks, M. R. Tuinstra, Jeffrey F. Pedersen, F. E. Dowell, K. D. Kofoid
Department of Agronomy and Horticulture: Faculty Publications
Eight lines of grain sorghum and their F1 hybrids were evaluated for contents of crude protein (CP), fat (FAT), and starch (STA); protein digestibility (PD); and in vitro dry matter disappearance (IVDMD). The effect of seed weight (SW) on these traits and the potential use of near infrared reflectance spectroscopy (NIRS) to predict them also were investigated. The male lines included three normal-seeded lines (TX2737, TX435, and P954063) and two largeseeded lines (PL-1 and Eastin1). The female lines included commonU.S. seed parent lines (Wheatland, Redlan, and SA3042). The lines and their hybrids were grown under dryland conditions at Kansas State …
Combinatorial Control Of Yeast Fet4 Gene Expression By Iron, Zinc, And Oxygen, Brian M. Waters, David J. Eide
Combinatorial Control Of Yeast Fet4 Gene Expression By Iron, Zinc, And Oxygen, Brian M. Waters, David J. Eide
Department of Agronomy and Horticulture: Faculty Publications
Acquisition of metals such as iron, copper, and zinc by the yeast Saccharomyces cerevisiae is tightly regulated. High affinity uptake systems are induced under metal-limiting conditions to maintain an adequate supply of these essential nutrients. Low affinity uptake systems function when their substrates are in greater supply. The FET4 gene encodes a low affinity iron and copper uptake transporter. FET4 expression is regulated by several environmental factors. In this report, we describe the molecular mechanisms underlying this regulation. First, we found that FET4 expression is induced in iron-limited cells by the Aft1 iron-responsive transcriptional activator. Second, FET …