Agronomy and Crop Sciences Commons^™

Effects Of Soil And Foliar Applications Of Zinc On Grain Zinc Concentrations Of Maize, Sorghum And Wheat In Zambia, Obed I. Lungu, S. Simunji, I. Cakmak

INTSORMIL Scientific Publications

Micronutrient deficiencies are quite widespread in Sub‐Saharan Africa including Zambia. A survey study of selenium and zinc content in selected soils and staple food crops showed low concentrations that suggested that populations might be at risk of low intake of these micronutrients through the diet. The beneficial effects of Se and Zn are well documented in human populations (Black et al. 2008). Agronomic bio‐fortification offers a promising strategy to address micronutrient deficiency in the diet (Cakmak, 2008). This study was conducted to evaluate the effects of soil and foliar applications of Zn on Zn concentrations in maize, sorghum and wheat.

Plant Pathologist And Grain Scientist Earn K-State’S Highest Honor, Gloria Holcombe

INTSORMIL Impacts and Bulletins

Two innovative College of Agriculture faculty — John Leslie, professor and head of the Department of Plant Pathology, and Xiuzhi “Susan” Sun, professor of grain science and industry — were selected university distinguished professors, a lifetime title and the highest honor K-State bestows on its faculty.

Phenological Development In Two-Row Spring Barley When Grown In A Long-Day (Alberta, Canada) And A Short-Day (Western Australia, Australia) Environment, Blakely Paynter, P E. Juskiw, J H. Helm

Grain and Other Field Crops Research Articles

Phenological development in eight cultivars of two-row, spring barley (Hordeum vulgare L.) was examined when sown at two dates of seeding in two diverse environments. These environments were a short-day environment at Northam, Western Australia, Australia, in 1997 and a long-day environment at Lacombe, Alberta, Canada, in 1998. The Australian and Canadian barley cultivars used had different combinations of basic vegetative phase and daylength sensitivity. Barley grown at Lacombe reached each stage of phenological development in less time than at Northam. Most noticeable was a shorter duration of the period between seedling emergence to double ridge and between double ridge …

Weed Science Research Summaries 2010, K. L. Smith, J A. Bullington, R. C. Doherty, J. R. Meier

Arkansas Agricultural Experiment Station Research Series

No abstract provided.

Arkansas Wheat Cultivar Performance Tests 2010-2011, R. E. Mason, R. G. Miller, R. D. Bond, E. A. Milus, J. P. Kelley, R. K. Bacon

Arkansas Agricultural Experiment Station Research Series

Wheat cultivar performance tests are conducted each year in Arkansas by the Arkansas Agricultural Experiment Station, Department of Crop, Soil and Environmental Sciences. The tests provide information to companies developing cultivars and/or marketing seed within the state and aid the Arkansas Cooperative Extension Service in formulating cultivar recommendations for small-grain producers.

Miscanthus 3 Giganteus Productivity: The Effects Of Management In Different Environments, Matt Maughan, German Bollero, D.K. Lee, Robert Darmody, Stacy Bonos, Laura Cortese, James Murphy, Roch E. Gaussoin, Matthew Sousek, David Williams, Linda Williams, Fernando Miguez, Thomas Voigt

Department of Agronomy and Horticulture: Faculty Publications

Miscanthus 9 giganteus is a C4 perennial grass that shows great potential as a high-yielding biomass crop. Scant research has been published that reports M. 9 giganteus growth and biomass yields in different environments in the United States. This study investigated the establishment success, plant growth, and dry biomass yield of M. 9 giganteus during its first three seasons at four locations (Urbana, IL; Lexington, KY; Mead, NE; Adelphia, NJ) in the United States. Three nitrogen rates (0, 60, and 120 kg ha -1) were applied at each location each year. Good survival of M. 9 giganteus during its first …

Evaluation Of Perennial Forage Legumes And Herbs In Six Mediterranean Environments, Daniel Real, Guangdi D. Li, Steve Clark, Tony Albertsen, Richard C. Hayes, Matt D. Denton, Mario F. D'Antuono, B S. Dear

Grain and Other Field Crops Research Articles

There is an absence of drought tolerant herbaceous perennial forage legume and herb options other than lucerne (Medicago sativa L.) for environments with Mediterranean-like climates common in extensive areas of Southern Australia, the Mediterranean basin, and Chile. Therefore, a collection of 174 forage perennial legume and herb entries from 103 species and 32 genera was evaluated for adaptation in a diverse range of Mediterranean climatic environments in Southern Australia. The seasonal rainfall distribution varied from moderately to highly winter dominant with long term average annual rainfall ranging from 318 to 655 mm. The entries were rated for productivity and …

Substantial Equivalence Assessment Of Transgenic Corn Plants, Martina Garda

Student Theses and Dissertations

Transgenic crops are regulated until they are judged to be as safe as non-transgenic plants. To grow them without permits, they must attain regulatory approval. . A lot of data are needed to show "substantial equivalence" and safety . This work deals with corn lines that contain cellulase genes. We hypothesize that no difference exists between Genetically Engineered (GE) and non-Genetically Engineered (non-GE) corn seeds at the morphological, protein, and DNA levels, except for the protein expressed specifically from the corresponding gene. This research will address concerns in commercializing GE crops, such as those containing a gene for either an …

Effects Of In Situ Freezing On Soil Net Nitrogen Mineralization And Net Nitrification In Fertilized Grassland Of Northern China, X. Zhang, W. Bai, Frank S. Gilliam, Q. Wang, X. Han, L. Li

Biological Sciences Faculty Research

Effects of soil freezing on nitrogen (N) mineralization have been the subject of increased attention in the ecological literature, though fewer studies have examined N mineralization responses to successive mild freezing, severe freezing and cyclic freeze–thaw events. Even less is known about relationships of responses to soil N status. This study measured soil N mineralization and nitrification in the field along an experimental N gradient in a grassland of northern China during the dormant season (October 2005–April 2006), a period in which freezing naturally occurs. Net N mineralization exhibited great temporal variability, with nitrification being the predominant N transformation process. …

Selecting Improved Lotus Nodulating Rhizobia To Expedite The Development Of New Forage Species, John Gregory Howieson, Ross Andrew Ballard, Ronald J. Yates, Nigel Charman

Grain and Other Field Crops Research Articles

Aims

In the past decades the increasing focus by Australian pasture development programs on the genus Lotus has seen the evaluation of many species previously untested in Australia. In field trials, nodulation failure was commonplace. This work was undertaken to select effective symbionts for Lotus to ensure further agronomic evaluation of the genus was not compromised. The symbiotic needs of Lotus ornithopodioides were a particular focus of the studies.

Methods

Glasshouse experiments were undertaken to evaluate symbiotic relationships between 15 Lotus spp and 23 strains of nodulating Mesorhizobium loti. This was followed by evaluation of elite rhizobial strains for …

2012 Barley Variety Sowing Guide For Western Australia, Blakely Paynter, Andrea Hills, Harmohinder Dhammu

Bulletins 4000 -

This variety guide is designed as a quick reference to help growers determine which barley variety to grow in their region. It provides domestic and international market feedback, relative grain yield comparisons, disease ratings, agronomic information and herbicide tolerance ratings for all malting barley varieties, the new food variety and selected feed varieties.

Gata-Family Transcription Factors In Magnaporthe Oryzae, Cristian F. Quispe

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

The filamentous fungus, Magnaporthe oryzae, responsible for blast rice disease, destroys around 10-30% of the rice crop annually. Infection begins when the specialized infection structure, the appressorium, generates enormous internal turgor pressure through the accumulation of glycerol. This turgor acts on a penetration peg emerging at the base of the cell, causing it to breach the leaf surface allowing its infection.

The enzyme trehalose-6- phosphate synthase (Tps1) is a central regulator of the transition from appressorium development to infectious hyphal growth. In the first chapter we show that initiation of rice blast disease requires a regulatory mechanism involving an …

B. R. Wells Rice Research Studies 2010, R. J. Norman, K. A. K. Moldenhauer

Arkansas Agricultural Experiment Station Research Series

The 2010 Rice Research Verification Program ( RRVP) was conducted on twenty-two commercial rice fields across the state. Counties rarticirating in the program included Arkansas, Ashley, Chicot, Clark, Clay, Cross, Desha, Drew, Greene, Jackson, Jefferson, Lafayette, Lawrence, Lonoke, Mississippi, Phillips, Poinsett (2 fields), Prairie, Randolph, St. Francis, and White for a total of 1456 acres. Grain yield in the 2010 RRVP averaged 167 bu/acre ranging from 113 to 215 bu/acre. The 2010 RRVP average yield was 25 bu/acre greater than the estimated Arkansas state average of 142 bu/acre. The highest yielding field was in Clay County with a grain yield …

Transpiration-Use Efficiency Coefficient Of Seven Weed Species As Affected By Fraction Of Transpirable Soil Water And Growth Stage, Venkatarao Mannam

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Transpiration-use efficiency coefficient (Kc) describes the amount of biomass produced per unit transpiration at a given vapor pressure deficit. A series of greenhouse experiments were conducted to determine the K_c values of seven weed species and to measure how K_c values were affected by fraction of transpirable soil water (FTSW) level and plant growth stage. Experiments were conducted using a factorial design with 4 levels of water stress (0.3, 0.4, 0.7, and 1.0 FTSW) and two harvest times (first bloom and seed maturity). After plants attained a predetermined size, each plant was sealed at the base using a …

Herbicide-Resistant Risk Assessment: Response Of Common Nebraska Weeds To Dicamba Dose, Roberto J. Crespo

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Dicamba-resistant soybeans are being developed to provide an additional herbicide mechanism of action that can be used in soybean, and to provide a tool to help manage or mitigate the evolution of other herbicide-resistant weed populations. The objectives of this thesis were to assess the risk of common Nebraska weeds developing resistance to dicamba, quantify baseline dose-response to dicamba of high-risk weed species, and survey the variability in dicamba dose-response among populations of those species. Twenty-five weed scientists were asked to estimate the risk likelihood of ten weed species evolving resistance to dicamba following the commercialization of dicamba-resistant soybean. Palmer …

Biology, Systematics, Phylogenetic Analysis And Dna Character-Based Species Diagnosis Of The False Root-Knot Nematode Nacobbus Aberrans (Thorne, 1935) Thorne & Allen 1944 (Nemata: Pratylenchidae), Angel Ramirez-Suarez

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

The False Root-Knot nematode Nacobbus aberrans is a plant parasitic nematode that causes yield losses in several crops and plant protection agencies have established regulations to prevent infestations from spreading to new agricultural areas. The taxonomic status of the nematode has been the subject of controversy due to wide degree of variation exhibited by the species. This variability has led to the suggestion that N. aberrans is actually a species complex rather than a single species. In order to test this hypothesis, we compared twelve N. aberrans populations, which include isolates from western Nebraska, two distinct regions of Mexico and …

Information To Action: Providing Management Recommendations To Agricultural Users Affected By Drought, Bruce Erickson

2011 Symposium on Data-Driven Approaches to Droughts

Mitigating drought’s impact on agricultural production is a key part of any food security and economic stabilization plan. While most agricultural producers periodically experience abnormally dry periods that sometimes limit production, extreme or exceptional droughts may occur infrequently enough that management strategies are unfamiliar, outdated, or untested in a particular set of circumstances. While information to spatially delineate and characterize the effects of a drought is important, the real payoff comes from providing drought-affected individuals with recommendations on how to best manage their situation, and for them to actually adopt these practices. In crop production the ramifications are many: decisions …

Sweet Sorghum As An Alternative Cellulosic Biofuel In Eastern Kentucky, Sarah A. Hazenfield

Morehead State Theses and Dissertations

A thesis presented to the faculty of the College of Science and Technology at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science by Sarah A. Hazenfield in June of 2011.

Soil Test And Phosphorus Rate For High Rainfall Clover Pastures, Robert Summers, David Weaver

Bulletins 4000 -

Essential information for soil testing to determine the phosphorus fertiliser requirements for clover pastures in high rainfall coastal areas of Western Australia. Includes procedures for soil sampling, tissue testing, liming, when to apply fertiliser, how to decide on the target production level, how much fertiliser is required and type of fertiliser.

Factors Controlling Pre-Columbian And Early Historic Maize Productivity In The American Southwest, Part 2: The Chaco Halo, Mesa Verde, Pajarito Plateau/ Bandelier, And Zuni Archaeological Regions, Larry Benson

United States Geological Survey: Staff Publications

Chemical and nutrient analyses of 471 soil samples from 161 sites within four archaeological regions (Pajarito Plateau/Bandelier, Zuni, Mesa Verde, and the Chaco Halo) were combined with historical climate data in order to evaluate the agricultural productivity of each region. In addition, maize productivity and field-life calculations were performed using organic-nitrogen (N) values from the upper 50 cm of soil in each region and a range (1–3%/year) of N-mineralization rates. The endmember values of this range were assumed representative of dry and wet climate states. With respect to precipitation and heat, the Pajarito Plateau area has excellent agricultural potential; the …