Life Sciences Commons^™

Assessment Of Density-Dependent Feeding Damage By The Cotton Dusky Bug, Oxycarenus Laetus Kirby (Hemiptera: Lygaeidae), In Cotton, Muhammad Ahsan Khan, Muhammad Dildar Gogi, Muhammad Hamid Bashir, Mubasher Hussain, Zain-Ul Abdin, Muhammad Aamir Rashid

Turkish Journal of Agriculture and Forestry

The dusky cotton bug, Oxycarenus laetus Kirby (Hemiptera: Lygaeidae), is a serious threat to cotton due to early cultivation of Bt cotton. These studies were carried out under laboratory and field conditions to estimate the feeding damage caused by O. laetus to seed weight, seed germination, and lint quality of cotton cultivar Bt-121 at 6 bug densities (0, 5, 10, 15, 20, and 25 adult pairs). The results revealed that seed germination and seed weight decreased, whereas percent reduction in seed germination and seed weight over control increased with increasing bug density. Bug density in the range of 5-25 pairs …

Durability Test On An Agricultural Tractor Engine Fuelled With Pure Biodiesel (B100), Marco Bietresato, Dario Friso

Turkish Journal of Agriculture and Forestry

The performance of a 118-kW tractor fuelled by pure biodiesel was monitored during a long-term field experiment with approximately 800 h of engine function. The objective was to demonstrate that B100, a pure biodiesel fuel, is a viable alternative to traditional diesel oil in terms of long-term mechanical reliability. A bench test on the new engine, performed by attaching a test stand to the power take-off of the tractor, showed an expected reduction in power (-9%) and torque (-7%) and an increase in specific consumption (+13%) when biodiesel was used as a complete substitute to diesel oil. Furthermore, with the …

Antioxidant And Radical Scavenging Activities In Fruits Of 6 Sea Buckthorn (Hippophae Rhamnoides L.) Cultivars, Otakar Rop, Sezai̇ Erci̇şli̇, Jiri Mlcek, Tunde Jurikova, Ignac Hoza

Turkish Journal of Agriculture and Forestry

Sea buckthorn (Hippophae rhamnoides L.) is a minor fruit crop. The most important breeding activities focused on the production of sea buckthorn fruits as a top-quality food product have been performed in Russia, Germany, and the Czech Republic. Over the past several decades, plant breeders have selected a number of cultivars that show excellent physical and nutritional properties. The aim of this study was to monitor and determine the total contents of phenols and flavonoids as well as antioxidant capacity and scavenging activity of methanolic extracts on reactive oxygen species and lipid peroxidation in some cultivars of sea buckthorn suitable …

Physicochemical Properties Of Turkish Green Tea Powder: Effects Of Shooting Period, Shading, And Clone, Ayhan Topuz, Cüneyt Di̇nçer, Mehmet Torun, İsmai̇l Tontul, Hi̇lal Şahi̇n Nadeem, Ayhan Haznedar, Feramuz Özdemi̇r

Turkish Journal of Agriculture and Forestry

This study aimed to determine the physicochemical properties of the green tea powders produced from 2 different Turkish tea [Camellia sinensis (L.) O.Kuntze] clones (Derepazarı 7 and Fener) grown under different shade levels and harvested during 2 consecutive shooting periods. Moisture, ash, crude fiber, and total phenolic contents of the green tea powders were determined based on the experimental factors. Products were also evaluated for their water activity, bulk density, particle size, color, extraction yield, and antioxidant activity. The shooting period, specific to Turkish tea cultivation, showed remarkable effects on the main quality parameters of the green tea powders. It …

Possibilities For The Use Of Whey In Tel Kadayıf (A Turkish Dessert) Production, Feri̇d Aydin, Songül Çakmakçi

Turkish Journal of Agriculture and Forestry

The utilisation of whey is very important for preventing the waste of a protein- and lactose-rich dairy by product and protecting the environment. Therefore, the objective of this study was to investigate the effect of whey use in tel (wire) kadayıf (a Turkish dessert raw material) production on microbiological and technological properties and sensory characteristics of tel kadayıf. For this purpose, 3 experimental tel kadayıf samples were produced using different amounts (0%, 25%, and 50%) of fresh whey instead of water in the production of raw tel kadayıf. The samples were placed in plastic bags and vacuum packaging and stored …

The Choice Of Auxin Analogue For In Vitro Root Induction Influences Post-Induction Root Development In Eucalyptus Grandis, Muhammad Nakhooda, Maria Paula Watt, David Mycock

Turkish Journal of Agriculture and Forestry

Previous studies on in vitro rooting for improved micropropagation of eucalypts indicated that root graviperception and post-acclimatisation architecture are determined by the relative exogenous auxin analogue and its stability, supplied during the pre-rooting culture stages. The specific roles of indole-3-acetic acid (IAA) and indole-3-butyric acid (IBA) in the rooting medium on the in vitro root morphological processes were explored using a good-rooting clone. In vitro rooting percentage was significantly reduced when either of the auxin inhibitors 2,3,5-triiodobenzoic acid (TIBA) and ρ-chlorophenoxyisobutyric acid (PCIB) or the auxin antagonist kinetin was supplied at rooting, with or without exogenous auxin. For all treatments, …

Bending Moment Capacity Of Simple And Haunched Mortise And Tenon Furniture Joints Under Tension And Compression Loads, Javane Oktaee, Ghanbar Ebrahimi, Mohammad Layeghi, Mohammad Ghofrani, Carl Albert Eckelman

Turkish Journal of Agriculture and Forestry

A study was conducted to examine the effects of tenon geometry on the bending moment capacity of simple and haunched mortise and tenon joints under the action of both compressive and tensile loads. The effects of tenon width (25, 37.5, and 50 mm), tenon thickness (7.5, 10, and 15 mm), and tenon length (20, 25, and 30 mm) were examined. All of the joints were constructed of Turkish beech (Fagus orientalis Lipsky) and were assembled with a 40% solid-content polyvinyl acetate. Optimum results were obtained with joints constructed with 10-mm-thick tenons that were 37.5 mm wide by 30 mm long. …

Assessment Of Forest Road Conditions In Terms Of Landslide Susceptibility: A Case Study In Yığılca Forest Directorate (Turkey), Remzi̇ Eker, Abdurrahi̇m Aydin

Turkish Journal of Agriculture and Forestry

Forest roads are one of the biggest investments in forest management. Their possible adverse effect on the environment is becoming an important issue for administrators due to a recent increase in public awareness. Especially in the Black Sea Region of Turkey, road-related landslides are common in forested areas because the roads are located in hilly regions with steep slopes. In addition to their impact on forests, landslides can cause damage to roadbeds which requires immediate maintenance. Landslide-susceptibility maps are widely used for different purposes such as reducing the effects of landslides, decision making, and planning. These maps can easily be …

Effects Of Climatic Factors On Grain Vitreousness Stability And Heritability In Durum Wheat, Gordana R. Brankovic, Dejan Dodig, Miroslav Z. Zoric, Gordana G. Surlan-Momirovic, Vesna Dragicevic, Nenad Duric

Turkish Journal of Agriculture and Forestry

Modern durum wheat breeding programs are becoming more oriented toward creation of not only high-yield cultivars but also high quality, with good stability for the trait of interest. Vitreousness of grain is associated with semolina granulation, color, and protein content; it is regarded as one of the most important characteristics in the grading industry, affecting the commercial value of the commodity. A set of 15 winter and facultative durum wheat genotypes was tested for grain vitreousness across 6 environments for 2 consecutive years. Three-way analysis of variance showed that genotype, location, and year contributed 4.1%, 20.6%, and 42.2% to the …

Screening Of Common Bean (Phaseolus Vulgaris L.) Cultivars Against Root-Lesion Nematode Species, Mehmet Ali̇ Söğüt, Fatma Gül Göze, Tufan Önal, Zübeyi̇r Devran, Muhammet Tonguç

Turkish Journal of Agriculture and Forestry

In this study, screening of 15 Phaseolus vulgaris cultivars and genotypes (Zülbiye, Kınalı, Perla, Kwintus, Özayşe, Tokat Sırık, Musica, Şelale, Nadide, Gina, Serra, Karabağ, Funda, and Lepus) and 1 Pisum sativum cultivar (Araka) for host suitability to 4 root-lesion nematodes, Pratylenchus thornei, P. crenatus, P. neglectus, and P. penetrans, was carried out in 2010 and 2011 under controlled conditions. The experiment was set up in a completely randomized block design with 7 replicates. Approximately 1000 adults + juveniles + eggs of root-lesion nematodes in 10 mL of distilled water were inoculated around the base of each bean seedling. The experiments …

The Effects Of Land Use And Land Cover Changes (Lulcc) In Kuseyr Plateau Of Turkey On Erosion, Emre Özşahi̇n, Veli̇ Uygur

Turkish Journal of Agriculture and Forestry

Erosion is one of the important problems in degradation of agricultural lands and other natural lands. The most dynamic factor in controlling erosion is land cover, and this factor has been anthropogenically manipulated for ages. This study investigates the effect of land use and land cover changes (LULCC) on erosion at Kuseyr Plateau, which is situated in the southernmost part of the eastern Mediterranean basin, Turkey. A geographical information systems-based method using the revised universal soil loss equation (3D) was employed to identify the amount of annual soil loss, erosion risk classes, and distribution generated by LULCC. Landsat satellite images …

Macronutrient Concentration And Remobilization In Spring Wheat Organs During Grain Filling, Murat Ti̇ryaki̇oğlu, Mehmet Yildirim, Sema Karanlik

Turkish Journal of Agriculture and Forestry

This study was conducted with 4 bread wheat genotypes to determine the macronutrient content in different plant organs during the grain filling period. Macronutrient contents such as nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg) were determined in lower stems, peduncles, lower leaves, flag leaves, rachises, florets, and grains. High genotype effects were found for all macronutrients and plant organs. N, P, K, and Mg decreased during grain filling in all plant parts except the grain. The rate of decrease varied depending on plant organs and nutrients. Grain nutrient concentration, except nitrogen content, increased up to physiological …

Nutrient Uptake Of Peanut Genotypes With Different Levels Of Drought Tolerance Under Midseason Drought, Hoang Thai Dinh, Wanwipa Kaewpradit, Sanun Jogloy, Nimitr Vorasoot, Aran Patanothai

Turkish Journal of Agriculture and Forestry

The objective of this study was to investigate the responses of peanut genotypes to midseason drought, regarding in particular nutrient uptakes and their correlations with biomass production and pod yield. The experiment was conducted during the dry seasons of 2011/12 and 2012/13. Five peanut genotypes with different levels of drought tolerance and 2 water regimes (well-watered and midseason drought) were laid out in a split-plot design with 4 replications. Midseason drought was imitated by stopping irrigation at 30 days after planting (DAP) and then rewatering at 60 DAP. The data were recorded for contents of N, P, K, Ca, and …

Evaluating The Impact Of Land Use Uncertainty On The Simulated Streamflow And Sediment Yield Of The Seyhan River Basin Using The Swat Model, Ashraf El-Sadek, Ahmet İrvem

Turkish Journal of Agriculture and Forestry

As a result of the increased availability of spatial information in watershed modeling, several easy to use and widely accessible spatial datasets have been developed. Yet, it is not easy to decide which source of data is better and how data from different sources affect model outcomes. In this study, the results of simulating the stream flow and sediment yield from the Seyhan River basin in Turkey using 3 different types of land cover datasets through the soil and water assessment tool (SWAT) model are discussed and compared to the observed data. The 3 land cover datasets used include the …

Genetic Variation For Growth And Yield Parameters In Half-Sib Progenies Of Melia Azedarach (Linn.), Himanshu Meena, Ashok Kumar, Rajni Sharma, Sanjeev Kumar Chauhan, Krishana Mohan Bhargava

Turkish Journal of Agriculture and Forestry

Fifty-four progenies of Melia azedarach selected from 11 geographical locations in India were evaluated for different growth parameters at the seed farm at Ladhowal, Punjab Agricultural University, Ludhiana, India. Significant differences were observed among and within progenies for all characters at the age of 8 years. Progeny number 1 exhibited superior growth for all traits except clear bole height and number of branches. High narrow-sense heritability (progeny basis, within-progeny basis, and individual plant basis) was higher for mean annual increments for total height and diameter at breast height than other recorded growth parameters. Genetic gain within progeny selection was higher …

Growth, Biomass, Carbon Stocks, And Sequestration In An Age Series Of Populus Deltoides Plantations In Tarai Region Of Central Himalaya, Gurveen Arora, Sumit Chaturvedi, Rajesh Kaushal, Ajeet Nain, Salil Tewari, Nurnabi Meherul Alam, Om Prakash Chaturvedi

Turkish Journal of Agriculture and Forestry

Growth, biomass, carbon storage, and carbon sequestration potential along an age series in Populus deltoides plantations were assessed. The growth rate of diameter at breast height and height was higher in trees of 4 to 7 years and 2 to 5 years, respectively. The total aboveground biomass (AGB) increased with age and reached its maximum (180.2 Mg ha^{-1}) at 11 years of age. Mean carbon concentration in aboveground components varied from 39.7% to 51.7%. Allometric equations were developed to estimate biomass and biomass carbon in different tree components, which had adjusted R squares greater than 94%. Aboveground carbon stocks in …

Is Canopy Interception Increased In Semiarid Tree Plantations? Evidence From A Field Investigation In Tehran, Iran, Seyed Mohammad Moein Sadeghi, Pedram Attarod, Thomas Grant Pypker, David Dunkerley

Turkish Journal of Agriculture and Forestry

From 30 January 2011 to 30 January 2012, we measured the rainfall interception (I) and canopy storage capacity (S) of individual trees of Pinus eldarica and Cupressus arizonica planted in the Chitgar Forest Park near Tehran, Iran. Gross rainfall (GR) in this semiarid region was measured using the mean of 6 plastic rain gauges placed in an open area adjacent to the trees. To measure throughfall (TF), 20 plastic rain gauges were installed beneath the crowns of 5 individual trees of each species. I was calculated as GR minus TF. S was estimated using indirect methods: the minimum, Gash and …

Germination And Electrical Conductivity Tests On Artificially Aged Seed Lots Of 2 Wall-Rocket Species, Simona-Laura Lazar, Sara Mira, Doru Pamfil, Juan Bautista Martinez-Laborde

Turkish Journal of Agriculture and Forestry

The aim of this study was to determine whether the loss of germinability and vigour in wall-rocket seed lots was related to electrolyte leakage. Ten seed lots of 2 wall-rocket species (9 of Diplotaxis tenuifolia and one of D. erucoides (Brassicaceae)) were stored at 45 °C and 70% relative humidity and electrolyte leakage was measured using the conductivity test. Small differences in longevity were found among species or seed lots, suggesting that a similar relative longevity might be expected within the genus Diplotaxis after artificial ageing, and that it will be above the average of that found in other species …

Occurrence Of Botryosphaeriaceae Species Associated With Grapevine Dieback In Algeria, Faiza Ammad, Messaoud Benchabane, Mohamed Toumi, Nesrine Belkacem, Amel Guesmi, Cherif Ameur, Pascal Lecomte, Othmane Merah

Turkish Journal of Agriculture and Forestry

Grapevine dieback is an increasing problem in grape vineyards in Algeria. We conducted field surveys each spring between 2006 and 2012 to determine the fungal pathogens associated with grapevine decline in various grape-growing regions. We isolated and identified 3 species of Botryosphaeriaceae (Botryosphaeria dothidea, Diplodia seriata, and Neofusicoccum parvum) from infected wood using a combination of morphological and cultural characters, as well as phylogenetic analyses of ribosomal DNA internal transcribed spacer (ITS) regions and fruiting body. We identified 20 isolates of Diplodia seriata, 13 isolates of Botryosphaeria dothidea, and 7 isolates of Neofusicoccum parvum. Inoculation of grapevine plantlets with the …

Hybrid Performance And Heterosis In F1 Offspring Of Triticale (× Triticosecale Wittm.), Mustafa Yildirim, Hasan Gezgi̇nç, Ali̇ Haydar Paksoy

Turkish Journal of Agriculture and Forestry

In this study, the combined ability effects and heterosis were determined for number of days to anthesis (AT), plant height (PH), fertile tillers plant^{–1} (FT), spike length (SL), spikelets spike–1 (SS) and grains spike–1 (GS), 1000-kernel weight (TW), and grain yield plant^{–1} (GY) of 4 triticale genotypes [Karma (G1), Presto (G2), Ayşehanım (G3), and Mehmetbey (G4)] and their 6 F_1 offspring. The mean squares of general combining ability (GCA) and specific combining ability (SCA) were statistically significant for all traits. According to the GCA/SCA, additive gene effects were found for all traits. According to the desired values for traits on …

Application Of A Multicriteria Decision-Making Approach For Rice Land Suitability Analysis In Turkey, İsmai̇l Sezer, Orhan Dengi̇z

Turkish Journal of Agriculture and Forestry

The main objective of this study was to implement a spatial model with a multicriteria assessment approach for rice (Oryza sativa L.) land suitability by using geographic information system (GIS) techniques. The land mapping units resulting from the overlay of the selected theme layers had unique land quality information on which land suitability was based. The selected theme layers of rice include topographic factor (slope), soil physical factors (soil depth, soil texture, drainage, stoniness, hydraulic conductivity), and soil chemical factors (pH, electrical conductivity, CaCO_3, soil fertility). These theme layers were collected from existing information. Spatial information of soil physical and …

Optimization Of Orius Majusculus Release: Photoperiodic Sensitivity At Different Temperatures And Storage Of Diapausing Adults, Şeri̇fe Ünal Bahşi̇, İrfan Tunç

Turkish Journal of Agriculture and Forestry

The photoperiodic sensitivity and storage of Orius majusculus (Reuter) from Antalya was investigated to obtain data for the optimization of its release. In the current study, it was not possible to induce a high (up to 100%) incidence of diapause unless all the nymphal instars and adults were successively exposed (i.e. full exposure) to a short day length (11.5 h) at constant temperatures of 18 and 26 °C, and fluctuating temperatures of 10/26 °C. Hence an intermittent exposure to long day lengths, even for short periods of time (only during instars IV–V or adult stage), would avoid a high incidence …

Bat Rabies In Guatemala, James E. Ellison, Amy T. Gilbert, Sergio Recuenco, David Moran, Danilo A. Alvarez, Natalia Kuzmina, Daniel L. Garcia, Leonard F. Peruski, Mary T. Mendonca, Kim A. Lindblade, Charles E. Rupprecht

United States Department of Agriculture Wildlife Services: Staff Publications

Rabies in bats is considered enzootic throughout the New World, but few comparative data are available for most countries in the region. As part of a larger pathogen detection program, enhanced bat rabies surveillance was conducted in Guatemala, between 2009 and 2011. A total of 672 bats of 31 species were sampled and tested for rabies. The prevalence of rabies virus (RABV) detection among all collected bats was low (0.3%). Viral antigens were detected and infectious virus was isolated from the brains of two common vampire bats (Desmodus rotundus). RABV was also isolated from oral swabs, lungs and …

Evaluating The Effect Of Short-Term Capture And Handling On Fecal Glucocorticoid Metabolite Levels In Mourning Doves, D. S. Jachowski, T. W. Wong, B. E. Washburn, J. H. Schulz, J. J. Millspaugh

United States Department of Agriculture Wildlife Services: Staff Publications

The measurement of stress hormones (i.e., glucocorticoids) has greatly advanced animal conservation. Fecal glucocorticoid metabolite assays are valuable because they are noninvasive, but their ability to detect responses to short-term (<30 >min) stressors in a way similar to blood serum assays is comparatively less well understood. We evaluated whether fecal glucocorticoid metabolites (FGMs) increased in captive wild mourning doves (Zenaida macroura) exposed to either a brief (<2 >min) capture, handling and release (CHR) or capture stress protocol (CSP; i.e., capture, hold for 30 min, release) treatment. Previous studies have shown that mourning doves exhibit elevated FGMs within 2-3 …

The Socioecology Of Monk Parakeets: Insights Into Parrot Social Complexity, Elizabeth A. Hobson, Michael L. Avery, Timonthy F. Wright

United States Department of Agriculture Wildlife Services: Staff Publications

In many species, individuals benefit from social associations, but they must balance these benefits with the costs of competition for resources. Understanding how these competing factors generate diversity in social systems is a major goal of behavioral ecology, but one that has been hampered by a lack of basic data quantifying many aspects of social structure and associations. Although parrots are generally assumed to have complex social groups, few studies have quantitatively examined these assumptions about parrot social structure. We critically assessed 4 assumptions about parrot socioecology using data from captive and wild groups of Monk Parakeets (Myiopsitta monachus …

Surveillance Of Feral Swine For Trichinella Spp. And Toxoplasmagondii In The Usa And Host-Related Factors Associatedwith Infection, D. E. Hill, J. P. Dubey, J. A. Baroch, S. R. Swafford, V. F. Fournet, D. Hawkins-Cooper, D. G. Pyburn, B. S. Schmit, H. R. Gamble, K. Pedersen, L. R. Ferreira, S. K. Verma, Y. Ying, O. C. H. Kwok, H. Feidas, G. Theodoropoulos

United States Department of Agriculture Wildlife Services: Staff Publications

Trichinella spp. and Toxoplasma gondii are important zoonotic parasites that infect warmblooded animals and humans worldwide. Among domesticated food animals, pigs are themain host for Trichinella spiralis. Pigs, chickens, sheep, and goats are known to be infectedwith T. gondii at varying rates, depending on husbandry. Infections in wildlife with theseparasites are generally higher than in domesticated species. Feral swine act as reservoirsof infection in the sylvatic ecosystem for Trichinella spp. and T. gondii, acting as sourcesof infection for peridomestic carnivores whose home ranges overlap with domestic pigs.Feral swine can have direct contact with non-biosecure domestic pigs, presenting oppor-tunity …

Coqui Frog Populations Are Negatively Affected By Canopy Opening But Not Detritus Deposition Following An Experimental Hurricane In A Tropical Rainforest, Paul D. Klawinski, Ben Dalton, Aaron B. Shiels

United States Department of Agriculture Wildlife Services: Staff Publications

Hurricanes, cyclones, and typhoons are common disturbances in many island and coastal forests. There is a lack of understanding of the importance to forest biota of the two major physical aspects that occur simultaneously during a hurricane: canopy disturbance and detritus (debris) deposition onto the ground. Using a replicated factorial design, our study involved experimentally determining the independent and interactive effects of canopy opening and debris additions to the forest floor on densities of coqui frogs (Eleutherodactylus coqui). Coquies are the dominant amphibian, and second most common vertebrate species, in the Luquillo Experimental Forest (LEF), a montane, tropical …

Ecological Routes Of Avian Influenza Virus Transmission To A Common Mesopredator: An Experimental Evaluation Of Alternatives, J. Jeffrey Root, Kevin T. Bentler, Susan A. Shriner, Nicole L. Mooers, Kaci K. Vandalen, Heather J. Sullivan, Alan B. Franklin

United States Department of Agriculture Wildlife Services: Staff Publications

Background: Wild raccoons have been shown to be naturally exposed to avian influenza viruses (AIV). However, the mechanisms associated with these natural exposures are not well-understood.

Methodology/Principal Findings: We experimentally tested three alternative routes (water, eggs, and scavenged waterfowl carcasses) of AIV transmission that may explain how raccoons in the wild are exposed to AIV. Raccoons were exposed to 1) water and 2) eggs spiked with an AIV (H4N6), as well as 3) mallard carcasses experimentally inoculated with the same virus. Three of four raccoons exposed to the high dose water treatment yielded apparent nasal shedding of >10^2.0 PCR …

Eqtl Networks Reveal Complex Genetic Architecture In The Immature Soybean Seed, Yung-Tsi Bolon, D. Hyten, James H. Orf, Carroll P. Vance, Gary J. Muehlbauer

Department of Agronomy and Horticulture: Faculty Publications

The complex network of regulatory factors and interactions involved in transcriptional regulation within the seed is not well understood. To evaluate gene expression regulation in the immature seed, we utilized a genetical genomics approach on a soybean [Glycine max (L.) Merr.] recombinant inbred line (RIL) population and produced a genome-wide expression quantitative trait loci (eQTL) dataset. The validity of the dataset was confirmed by mapping the eQTL hotspot for flavonoid biosynthesis-related genes to a region containing repeats of chalcone synthase (CHS) genes known to correspond to the soybean inhibitor locus that regulates seed color. We then identified eQTL for …

Glyphosate-Resistant Giant Ragweed (Ambrosia Trifida) Control In Glufosinate-Resistant Soybean, Simranpreet Kaur, Lowell D. Sandell, John L. Lindquist, Amit J. Jhala

Department of Agronomy and Horticulture: Faculty Publications

Glyphosate-resistant giant ragweed is one of the most competitive weeds of agronomic crops in the United States. Early emergence and rapid growth rate makes giant ragweed a competitive weed early in the season and reduces crop yields. Therefore, early spring control of giant ragweed using a preplant herbicide is critical. Glufosinate is an alternative POST herbicide for weed control in glufosinate-resistant soybean. Field experiments were conducted at David City, NE, in 2012 and 2013 to evaluate the efficacy of preplant herbicides followed by glufosinate applied alone or in tank mixes for control of glyphosate-resistant giant ragweed in glufosinate-resistant soybean. Preplant …