Digital Commons Network^™

Shallow Aggregate Ebb-And-Flow System For Greenhouse Lettuce Production, Joseph Chidiac

Graduate Theses and Dissertations

A novel soilless technique for the production of lettuce was developed and evaluated for its viability for ornamental greenhouse growers adapting their ebb-and-flood irrigation benching systems to diversify into growing lettuce, without having to purchase the conventional nutrient film technique (NFT) or deep flow technique (DFT) hydroponic systems. The experimental design was a three by four factorial, with three treatments for aggregate depth (19, 38, and 57 mm) and four treatments for irrigation frequency (once every 1, 2, 4, or 8 hours), for a total of twelve treatment combinations. Each treatment was replicated three times in a randomized complete block …

New Technologies For Evaluating Putting Green Surface Characteristics, Daniel Patrick O'Brien

Graduate Theses and Dissertations

Golf course putting greens require a high level of inputs predicated on timely, well informed decisions. Putting green quality is ultimately defined by performance of the turfgrass, and this performance encompasses both (i) the health and vitality of the turfgrass plants, and (ii) the ability of the turfgrass to exist as a playing surface, as it interacts with the golf ball. For golf course superintendents, accurately and efficiently assessing moisture levels and nutrient status are critical for guiding maintenance practices. This research sought to examine new ways for measuring each of these parameters, and compared them to ground-truth data and/or …

Evaluation Of Provisia Rice In Arkansas Rice Production Systems, Zachary Lancaster

Graduate Theses and Dissertations

With the continued evolution of herbicide resistance, it is becoming more difficult to achieve adequate weed control in Arkansas rice production systems. Thus, new technologies are needed to combat these troublesome weeds. A new non-GMO, herbicide-resistant rice type is under development that is resistant to quizalofop, an acetyl coenzyme A carboxylase (ACCase)-inhibiting herbicide that will allow for selective grass weed control in rice. With the commercialization of this technology by 2018, research was conducted to determine the best fit for quizalofop-resistant rice in current production systems. Experiments included evaluation of off-target movement of quizalofop, determination of plant-back risk from quizalofop …

Evaluation Of Very-Long-Chain Fatty Acid-Inhibiting Herbicides In Arkansas Rice Production, John Ansley Godwin

Graduate Theses and Dissertations

Because of the evolution of herbicide-resistant weeds, such as barnyardgrass and red rice in rice, there is a need for alternative herbicide sites of action. Very-long-chain fatty acid (VLCFA)-inhibiting herbicides are not labeled for use in U.S. rice production; however, this site of action (SOA) has been used with success in Asian rice. The VLCFA-inhibiting herbicides pethoxamid, pyroxasulfone, acetochlor, and S-metolachlor were evaluated for rice tolerance and control of commonly problematic weeds in Arkansas rice at various rates and application timings. Pyroxasulfone and S-metolachlor were deemed unfit for use in rice production because of negative effects on rice visual injury, …

Characterization Of Multiple-Herbicide-Resistant Echinochloa Colona From Arkansas, Christopher Edward Rouse

Graduate Theses and Dissertations

Echinochloa species are highly adaptive weeds that have the potential to impact crops in a variety of environments. This has positioned them as the most problematic weeds in a number of USA cropping systems with some species having the distinction of the 'worst herbicide-resistant weeds' in the world. Recent evidence has positioned Echinochloa colona (junglerice) as the most dominant in Arkansas and throughout the Mid-South, USA, especially in rice (Oryza sativa L.) and soybean (Glycine max L.) production fields. A history of extensive herbicide-use for management and a lack of integrated or diverse approaches to management have led to rampant …

The Effect Of Preflood Nitrogen And Flood Establishment Timing On Rice Development, Nitrogen Uptake And Grain Yield, Tyler Richmond

Graduate Theses and Dissertations

Urea-N fertilizer is typically applied at the 5-leaf stage to rice (Oryza sativa L.) grown in a dry-seeded, delayed-flood production system. How long the preflood-N can be delayed without adverse effects on yield potential is poorly understood. The research objective was to determine the effects of preflood-N application and flood establishment timing on aboveground-N content, 50% heading, yield components, and grain yield. Trials were established on silt loam soils at the Pine Tree Research Station (PTRS) and Rice Research and Extension Center (RREC) during 2015 and 2016. Urea-N was applied at 0, 45, 90, 135, and 180 kg N ha-1 …

Characterization Of Glyphosate-Resistant Amaranthus Palmeri (Palmer Amaranth) Tolerance To Als- And Hppd-Inhibiting Herbicides, Shilpa Singh

Graduate Theses and Dissertations

Palmer amaranth is a principal weed problem across the United States and is resistant to several herbicide modes of action. By 2008, Palmer amaranth in Arkansas was reported to be resistant to both ALS- and EPSPS-inhibitors, but the predominant resistance mechanisms are yet to be explored. Herbicide options with different modes of action are needed to provide effective Palmer amaranth control and HPPD-inhibitors (e.g. mesotrione) are among these. The goal of this research was to elucidate the resistance profile of Palmer amaranth in Arkansas to ALS herbicides and glyphosate (EPSPS-inhibitor) as well as evaluate the differential tolerance of Palmer amaranth …

Evaluating The Impact Of Two Contrasting Tillage Practices On Soil Properties In Central Kentucky, Emily Cook

Posters-at-the-Capitol

Farming practices such as no tillage and plowing can institute change on soil physical and chemical characteristics. In this research, the effects of long-term conventional and no-tillage systems on the selected soil properties were determined in a continuous corn system on a farm with Maury silt loam soil. These samples were taken from University of Kentucky's Research Farm (Spindletop Farm). The field used was tilled in 1969 from bluegrass sod and the first time research was conduced was in 1970. Each plot is 20 ft. by 40 ft. and for many years each plot was split with winter cover crop …

Investigating The Toxicity And Accumulation Of 2,4-Dichlorophenoxyacetic Acid (2,4-D) And Glyphosate In Eisenia Fetida, Caitlin Lazurick, Nicole Lidzbarski, Rachel Owings, Jeff Brotherton, Edna Steele

Journal of the South Carolina Academy of Science

Glyphosate, the main ingredient in Roundup^®, is the most widely used herbicide in the world. It is also used in combination with another effective herbicide, 2,4-D, in the formulation called Enlist Duo^®. The EPA approved the use of Enlist Duo^® on certain crops including those genetically modified to be resistant to both herbicides. The predicted significant increase in the use of these herbicides raised concerns from the general public because both compounds have been classified as possibly or probably carcinogenic. Since herbicides are applied directly to vegetation, the safety of organisms that come in contact …

Substantial Contribution Of Genetic Variation In The Expression Of Transcription Factors To Phenotypic Variation Revealed By Erd-Gwas, Hung-Ying Lin, Qiang Liu, Xiao Li, Jinliang Yang, Sanzhen Liu, Yinlian Huang, Michael J. Scanlon, Dan Nettleton, Patrick S. Schnable

Department of Agronomy and Horticulture: Faculty Publications

Background: There are significant limitations in existing methods for the genome-wide identification of genes whose expression patterns affect traits.

Results: The transcriptomes of five tissues from 27 genetically diverse maize inbred lines were deeply sequenced to identify genes exhibiting high and low levels of expression variation across tissues or genotypes. Transcription factors are enriched among genes with the most variation in expression across tissues, as well as among genes with higher-than-median levels of variation in expression across genotypes. In contrast, transcription factors are depleted among genes whose expression is either highly stable or highly variable across genotypes. We developed a …

Estimation Of Irrigation Requirements For Drip-Irrigated Maize In A Sub-Humid Climate, Liu Yang, Hai-Shun Yang, Jiu-Sheng Li, Yan-Feng Li, Hai-Jun Yan

Department of Agronomy and Horticulture: Faculty Publications

Drip-irrigation is increasingly applied in maize (Zea mays L.) production in sub-humid region. It is critical to quantify irrigation requirements during different growth stages under diverse climatic conditions. In this study, the Hybrid-Maize model was calibrated and applied in a sub-humid Heilongjiang Province in Northeast China to estimate irrigation requirements for drip irrigated maize during different crop physiological development stages and under diverse agro-climatic conditions. Using dimensionless scales, the whole growing season of maize was divided into diverse development stages from planting to maturity. Drip-irrigation dates and irrigation amounts in each irrigation event were simulated and summarized in 30-year simulation …

Identifying Ecologically Relevant Scales Of Habitat Selection: Diel Habitat Selection In Elk, Caleb P. Roberts, James W. Cain Iii, Robert D. Cox

Department of Agronomy and Horticulture: Faculty Publications

Although organisms make resource selection decisions at multiple spatiotemporal scales, not all scales are ecologically relevant to any given organism. Ecological patterns and rhythms such as behavioral and climatic patterns may provide a consistent method for identifying ecologically relevant scales of habitat selection. Using elk (Cervus canadensis) as an example species, we sought to test the ability of behavioral patterns to empirically partition diel scales for modeling habitat selection. We used model selection to partition diel scales by shifts in dominant behavior and then used resource selection probability functions to model elk habitat selection hierarchically at diel scales within seasons. …

Agricultural Responses To Climate Change: A Study Of Adaptive Farming Methods In Kizanda Village, Bailey Smith-Helman

Independent Study Project (ISP) Collection

Agriculture is vital to the economic and social systems in Tanzania, composing 30% of the country’s GDP as well as 80% of employment (FAO, 2014). Despite agriculture’s important role, it remains one of the most vulnerable sectors to climate change. Current trends project global average temperature to increase by 0.8-2.6 degrees Celsius, leaving farmers to face changes in rainfall, soil quality, and new pests and diseases (IPCC, 2007). Farmers will be forced to adapt to the changing climate if they are to sustain their livelihoods and the Tanzanian economy. For these reasons, it is important to understand the types of …

Effects Of Nitrogen And Phosphorus Fertilizer And Topsoil Amendment On Native Plant Cover In Roadside Revegetation Projects, Heidi L. Hillhouse, Walter H. Schacht, Jonathan M. Soper, Carol E. Wienhold

Department of Agronomy and Horticulture: Faculty Publications

Establishing vegetation on roadsides following construction can be challenging, especially for relatively slow growing native species. Topsoil is generally removed during construction, and the surface soil following construction (“cut-slope soils”) is often compacted and low in nutrients, providing poor growing conditions for vegetation. Nebraska Department of Transportation (NDOT) protocols have historically called for nitrogen (N) and phosphorus (P) fertilization when planting roadside vegetation following construction, but these recommendations were developed for cool-season grass plantings and most current plantings use slower-establishing, native warmseason grasses that may benefit less than expected from current planting protocols. We evaluated the effects of nitrogen and …

Respons Tanaman Gandum Akibat Pemberian Sitokinin Berbagai Konsentrasi Dan Waktu Aplikasi Di Dataran Medium Jatinangor, Fiky Yulianto Wicaksono, Asyifa Fiani Putri, Yuyun Yuwariah, Yudithia Maxiselly, Tati Nurmala

Jurnal Kultivasi

Pertumbuhan dan hasil gandum (Triticum aestivum L.) diketahui dapat ditingkatkan dengan pemberian sitokinin. Sitokinin berperan juga dalam menunda penuaan daun gandum dan mengurangi cekaman panas di dataran medium. Penelitian ini bertujuan untuk mengetahui pengaruh interaksi berbagai konsentrasi sitokinin dengan berbagai waktu aplikasinya terhadap pertumbuhan dan hasil tanaman gandum. Penelitian menggunakan metode percobaan yang dilakukan di kebun percobaan Ciparanje Fakultas Pertanian Universitas Padjadjaran, Jatinangor, Sumedang mulai bulan November 2016 sampai dengan Februari 2017. Rancangan percobaan yang digunakan adalah Rancangan Acak Kelompok, sementara rancangan perlakuan adalah faktorial. Perlakuan terdiri dari dua faktor, yaitu konsentrasi sitokinin (3 taraf) dan waktu aplikasi (5 taraf). …

Reciprocal Effect Of Parental Lines On The Physiological Potential And Seed Composition Of Corn Hybrid Seeds, Juliana F. Santos, Lynnette M. A. Dirk, A. Bruce Downie, Mauricio F. G. Sanches, Roberval D. Vieira

Horticulture Faculty Publications

Obtaining corn hybrid seeds (Zea mays L.) with high vigour depends on the parental lines and the direction of the cross, and this relates to seed desiccation tolerance and composition. This research studied reciprocal crosses between pairs of proprietary, elite parent lines (L1 and L5; L2 and L4) producing hybrid seeds with different qualities attempting to correlate vigour with seed composition, focusing on storage proteins, starch and soluble sugar amounts. Four corn hybrid seed lots produced from reciprocal crosses were compared (HS 15 with HS 51, and HS 24 with HS 42) by assessing germination, vigour, and seedling emergence …

Summaries Of Arkansas Cotton Research 2016, Fred Bourland

Arkansas Agricultural Experiment Station Research Series

No abstract provided.

Control Of Glyphosate-Resistant Common Ragweed (Ambrosia Artemisiifolia L.) In Glufosinate-Resistant Soybean [Glycine Max (L.) Merr], Ethann R. Barnes, Stevan Z. Knezevic, Peter H. Sikkema, John L. Lindquist, Amit J. Jhala

Department of Agronomy and Horticulture: Faculty Publications

Common ragweed emerges early in the season in Nebraska, USA and is competitive with soybean; therefore, preplant herbicides are important for effective control. Glyphosate has been used as a preplant control option; however, confirmation of glyphosate-resistant (GR) common ragweed in Nebraska necessitates evaluating other herbicide options. The objectives of this study were to (1) evaluate the efficacy of preplant (PP) herbicides followed by (fb) glufosinate alone or in tank-mixture with imazethapyr, acetochlor, or S-metolachlor applied post-emergence (POST) for control of GR common ragweed in glufosinate-resistant soybean; (2) their effect on common ragweed density, biomass, and soybean yield; and (3) the …

Evaluating Mine Soil Prepared By Scraper Pans For Herbaceous Plants And Pine Seedlings At An East Texas Lignite Surface Mine, Hannah Z. Angel

Electronic Theses and Dissertations

Since 1974, Luminant Mining Company, LLC (Luminant) has planted over 38.7 million trees on its reclaimed lignite surface mine operations in Texas. For decades, the use of improved reclamation techniques on Luminant’s mined lands have resulted in over 31,160 ha reclaimed to forests, wildlife habitat, and pastures with productivity levels similar to those found on unmined lands. The development of new reclamation methodologies offers opportunities to further improve productivity of planted trees at Luminant’s Martin Lake Oak Hill Mine in east Texas. The conventional haulback or ‘truck shovel’ reclamation method uses haul trucks for the selective transport and placement of …

Pinching And Spacing Effects On Cut Sunflower (Helianthus Annuus) Production In East Texas, Rebecca B. Burnett

Electronic Theses and Dissertations

Three experiments evaluated pinching and spacing on Helianthus annuus in East Texas to determine their effects on growth and development. Experiment 1 was designed to determine the effects of pinching nodes 1, 2, 3, or 4 on ‘Pro Cut Gold’ sunflowers. Results from experiment 1 showed non-pinched plants produced marketable stem lengths and flower sizes, while pinched plants’ stem length, stem diameter, flower diameter, and disk diameter decreased compared to the non-pinched plants. The objective for experiment 2 was to evaluate pinching and spacing treatments on ‘Pro Cut Gold’ sunflowers. All spacings for non-pinched plants in experiment 2 produced marketable …

Pengaruh Konsentrasi Zat Pengatur Tumbuh Alami Dan Sintetik Terhadap Pertumbuhan Tanaman Teh (Camellia Sinensis (L.) O. Kuntze) Klon Gmb 7 Setelah Centering, Silfiya Amaliyana Saefas, Santi Rosniawaty, Yudithia Maxiselly

Jurnal Kultivasi

Tanaman teh merupakan tanaman tahunan yang memiliki organ target pucuk. Tanaman teh dapat ditingkatkan pertumbuhannya dengan pemeliharaan berupa centering dan pemberian zat pengatur tumbuh (ZPT) sitokinin pada fase TBM. Penelitian ini bertujuan untuk memperoleh konsentrasi zat pengatur tumbuh alami atau sintetik yang berpengaruh paling baik terhadap pertumbuhan tanaman teh klon GMB 7 setelah centering. Penelitian ini dilakukan pada bulan November 2016 sampai Maret 2017 di kebun percobaan Ciparanje, Fakultas Pertanian Universitas Padjadjaran, Jatinangor, Kabupaten Sumedang, Jawa Barat. Penelitian ini menguji beberapa konsentrasi zat pengatur tumbuh (ZPT) sitokinin, yaitu air kelapa sebagai ZPT alami pada konsentrasi 25%, 50%, 75% dan Benzil …

Pengaruh Konsentrasi Benzyl Amino Purine Terhadap Pertumbuhan Beberapa Klon Tanaman Teh (Camellia Sinensis L.) O. Kuntze) Belum Menghasilkan Di Dataran Rendah, Indah Ayuningsari, Santi Rosniawaty, Yudithia Maxiselly, Intan Ratna Dewi Anjarsari

Jurnal Kultivasi

Pertumbuhan tanaman teh (Camellia sinensis L.) O. Kuntze) di dataran rendah dipengaruhi oleh faktor genetik dan faktor lingkungan. Faktor genetik berupa klon unggul dan faktor lingkungan berupa aplikasi hormon eksogen diharapkan mampu meningkatkan pertumbuhan tanaman teh belum menghasilkan (TBM) di dataran rendah. Penelitian disusun menggunakan Rancangan Petak Terbagi (RPT) dengan dua faktor perlakuan. Klon sebagai petak utama yang terdiri dari GMB 4, GMB 7, GMB 9, dan GMB 11. Konsentrasi Benzyl Amino Purine (BAP) sebagai anak petak yang terdiri dari 0 ppm, 30 ppm, 60 ppm, 90 ppm, dan 120 ppm. Hasil penelitian menunjukan adanya interaksi antara klon dan konsentrasi …

Impact Of Seed Protein Alleles From Three Soybean Sources On Seed Composition And Agronomic Traits, Lillian F. Brzostowski, Timothy I. Pruski, James Specht, Brian W. Diers

Department of Agronomy and Horticulture: Faculty Publications

Evaluation of seed protein alleles in soybean populations showed that an increase in protein concentration is generally associated with a decrease in oil concentration and yield.

Soybean [Glycine max (L.) Merrill] meal is one of the most important plant-based protein sources in the world. Developing cultivars high in seed protein concentration and seed yield is a difficult task because the traits have an inverse relationship. Over two decades ago, a protein quantitative trait loci (QTL) was mapped on chromosome (chr) 20, and this QTL has been mapped to the same position in several studies and given the confirmed QTL …

Pengaruh Dosis Silika Terhadap Karakter Fisiologı Dan Hasil Tanaman Padi (Oryza Sativa L.) Kultivar Lokal Poso (Kultıvar 36-Super Dan Tagolu), Wan Priando Tampoma, Tati Nurmala, Meddy Rachmadi

Jurnal Kultivasi

Padi (Oryza sativa L.) merupakan salah satu jenis tanaman yang memegang peran penting di Indonesia dalam memenuhi kebutuhan pangan. Tanaman padi kultivar lokal merupakan salah satu jenis padi yang memiliki poduktivitas rendah. Pemberian silika pada pertanaman padi dapat membantu mengoptimalkan pertumbuhan dan hasil tanaman padi. Tujuan penelitian ini adalah untuk mengetahui pengaruh silika terhadap karakter agronomi kultivar lokal Poso. Rancangan percobaan yang digunakan dalam penelitian ini adalah menggunakan Rancangan Petak Terbagi (RPT). Faktor pertama sebagai petak utama terdiri dua taraf perlakuan yaitu K1 (Kultivar 36-Super) dan K2 (Kultivar Tagolu). Sedangkan faktor ke dua sebagai anak petak terdiri atas 4 taraf …

Respons Tanaman Kedelai (Glycine Max) Varietas Wilis Akibat Pemberian Berbagai Dosis Pupuk N, P, K, Dan Pupuk Guano Pada Tanah Inceptisol Jatinangor, Agus Wahyudin, Fiky Yulianto Wicaksono, Aep Wawan Irwan, Ruminta, Rizka Fitriani

Jurnal Kultivasi

Penelitian ini bertujuan untuk melihat apakah pemberian Pupuk Organik Padat Guano dapat memberikan hasil yang sama dengan pemberian Pupuk N,P,K. Percobaan dilakukan di Rumah Kaca Fakultas Pertanian Universitas Padjadjaran, Jatinangor dengan ketinggian 754m dpl dan menggunakan tanah inceptisol dengan pH 6,18.Rancangan percobaan yang digunakan adalah Rancangan Acak Kelompok, terdiri dari 8 perlakuan kombinasi dosis pupuk, yang terdiri dari 100% N,P,K, 100% Pupuk Guano, 75% N,P,K + 100% Pupuk Guano, 50% N,P,K + 100% Pupuk Guano, 75% N,P,K + 75% Pupuk Guano, 50% N,P,K + 75% Pupuk Guano, 75% N,P,K + 50% Pupuk Guano serta 50% N,P,K + 50% Pupuk Guano. …

Application Of X-Ray Imaging As A Technique For Fissure Detection In Rough Rice Kernels, Zephania R. Odek

Graduate Theses and Dissertations

Fissured rice kernels break during milling, leading to head rice yield (HRY) reductions. Conventional fissure detection instruments cannot be used to observe fissures in rough rice kernels, the form in which rice in normally dried and stored. X-rays can penetrate hulls allowing visualization of the internal structure of a rough rice kernel. This study evaluated the capability of X-ray imaging to adequately detect fissures in rough rice and established a correlation between HRY and the fissured kernel percentage (FKP) in a rough rice sample. Fifteen long-grain rice cultivars, harvested in Arkansas in 2015 and 2016 were dried using heated air …

Evaluating Methods For Quantifying Evapotranspiration In Arkansas Rice, Colby Reavis

Graduate Theses and Dissertations

The goal of this study was to evaluate different methods for quantifying evapotranspiration (ET) in commercial rice fields using different irrigation regimes. The rice fields were located in south central Arkansas. The different irrigation regimes were alternate wetting and drying (AWD) and continuous flooding (CF). Alternate wetting and drying and conventional flooding estimates of ET were 602 mm and 570 mm, respectively, based on field observations using eddy covariance. Models used to estimate ET estimated values between 498 and 653 mm for the 2015 growing season. The Penman Monteith actual evapotranspiration model (PM AET) performed best when compared to the …

Msh1-Mediated Non-Genetic Phenotypic Variation In Plants: Prospects For Epigenetic Breeding In Sorghum Bicolor, Dikungwa Ketumile

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

Sorghum is the fifth most important cereal crop grown in the world, and is the primary staple food for many people in developing countries. Like other major crops, its improvement is constrained by depletion of genetic diversity within breeding germplasm. Investigated in this study is the unique creation of non-genetic phenotypic variation through altering MutS Homolog1 (MSH1), a plant-specific gene, and the potential it presents for sorghum improvement. Suppression of MSH1 results in non-genetic developmental reprogramming. The derived MSH1 memory lines, when used in crossing, result in heritable phenotypic variation that enhances plant vigor and agronomic performance. A …

Studies In Blackberry: Development And Implementation Of A Phenotyping Protocol For Blackberry Seedling Populations And Impact Of Time Of Day Of Harvest On Red Drupelet Reversion For University Of Arkansas Blackberry Genotypes, Melinda Yin

Graduate Theses and Dissertations

There are two major public blackberry (Rubus L. subgenus rubus Watson) breeding programs in the United States: one at the University of Arkansas (UA) and another at the U.S. Department of Agriculture Agricultural Research Service Horticultural Crops Research Unit (USDA-ARS HCRU) based in Corvallis, OR. The germplasm and breeding objectives of these two breeding programs are diverse, but frequent collaboration necessitated a standardized method of characterizing plant and fruit traits. A phenotyping protocol for blackberry was developed at UA and implemented for two years on UA seedling populations. The protocol included plant traits (health, vigor, estimated crop load, peak bloom …

A Laboratory-Scale Study On The Production Of High-Value Products From Broiler Litter Involving Solid-State Anaerobic Digestion And Mushroom Cultivation, Joe Barrett Carter Iii

Graduate Theses and Dissertations

There is a need to investigate alternate uses and treatments of broiler litter that lessen environmental impacts and decrease costs associated with its disposal. Anaerobic digestion is a biological process in which organic material is converted to a renewable fuel source. However, the substrate for anaerobic digestion often requires some form or pretreatment. Certain types of fungus have been investigated as a pretreatment for anaerobic digestion, one of which is Pleurotis ostreatus or the oyster mushroom, which also produces an edible fruiting body. Thus, this study was performed to investigate the use of broiler litter for oyster mushroom cultivation and …