Erdal Ozkan

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Erdal Ozkan

Professor

ozkan.2@osu.edu

614-292-3006

Office:

226 Agricultural Engineering

590 Woody Hayes Drive

Professional Information

Biography:

Dr. Ozkan is internationally-recognized for his scholarly activities in the area of pesticide application technology and pesticide waste management. In addition to conducting research and co-teaching a course in Pesticide Application, he provides leadership in development and implementation of Extension educational programs in Ohio related to new developments in pesticide application technology. Some of the specific research and teaching areas Dr. Ozkan is involved in includes:

Efficient and effective application of pesticides
Design, development and operation of pesticide application equipment
Selection of best spray equipment and nozzles for specific application situations
Technologies for reducing spray drift
Technologies for reducing pesticide waste
Variable-rate application of pesticides
Field evaluation of spray equipment for spray drift and efficacy

Dr. Ozkan has produced a variety of educational materials. He has authored or co-authored 5 book chapters, over 80 refereed journal publications, 60 other educational publications for pesticide applicators, farmers and sprayer manufacturers. He has presented technical papers at over 100 conferences in the U.S.A. and in other countries. He has developed numerous microcomputer software and audio-visuals related to pesticide application technology. 20 of his educational materials have received the ASABE (American Society of Agricultural and Biological Engineering) Educational Aids Blue Ribbon Award. Most recently, he is the co-recipient of the ASABE’s “Design Concept of the Year” award for development of a variable rate orchard sprayer using laser technology. He is a Fellow of ASABE, a recognition given to only 10 to 12 ASABE members annually for their outstanding scholarly accomplishments.

EDUCATION

Ph.D. 1979 Agricultural Engineering, University of Missouri

M.S. 1976 Agricultural Engineering, University of Missouri

B.S. 1973 Agricultural Engineering, Ataturk University, Turkey

EMPLOYMENT HISTORY

7/93 - Present: Professor, Agricultural Engineering Department, The Ohio State University. Major responsibilities are in outreach education and research. Responsible for developing and delivering statewide outreach education (extension) programs related to pesticide application technology including handling of pesticides and management of pesticide wastes. Research topics include pesticide application technology and agricultural machinery management.

11/85 - 6/93: Associate Professor, Agricultural Engineering Dept., The Ohio State University

7//84 -11/85: Associate Professor, Agricultural Engineering Dept., Iowa State University.

3/80 - 6/84: Assistant Professor, Agricultural Engineering Dept., Iowa State University. Developed and supervised state-wide outreach education programs as a state specialist with Iowa Cooperative Extension Service.

AWARDS

2017 Co-recipient of “Innovator of the Year Award”, College of Food, Agricultural and Environmental Sciences, The Ohio State University.

2015 ASABE Rainbird Engineering Concept of the Year

2013 ASABE Superior Research Paper award

1982-present: Twenty ASAE Blue Ribbon Awards from the American Society of Agricultural Engineers (ASAE) for outstanding Educational Aids (11 publications, 3 microcomputer programs, 2 slide sets, 2 extension methods, 1 display).

2006 Honorable mention. ASABE Technical paper award.

2002 College of FAES, Ohio State University, Departmental Advising Award.

1992 OARDC Faculty Research Award (FABE Application Technology Research Team)

1993: First Place: Epsilon Sigma Phi Tools for Teaching Competition- Slide Set Category

1991: First Place: Epsilon Sigma Phi Tools for Teaching Competition- Slide Set Category

1991: Third Place: Epsilon Sigma Phi Tools for Teaching Competition- Team Teaching Category (Cooperators in team teaching: J. Heimlich, M.L. Wilson)

1988: First Place: Epsilon Sigma Phi Tools for Teaching Competition- Slide Set Category

1988: Second place: Epsilon Sigma Phi Tools for Teaching Competition- Exhibit Category (co-producers, R. Reeder and J. Victor).

1987: First Place: Epsilon Sigma Phi Tools for Teaching Competition- Videotape category

1979: Selected for inclusion in "Who's Who Among Students in American Colleges and Universities."

Works

PUBLICATIONS

Refereed journal publications

Ozkan, H.E. and J.C. Frisby. 1981. Determining production policies for crops to maximize net energy return. Agricultural Energy Vol 2, 427-432.
Ozkan, H.E. and J.C. Frisby. 1981. Optimizing field machinery systems energy consumption. Transactions of the ASAE 24(2):296_300.
Ozkan, H.E. and J.C. Frisby. 1981. Farm energy efficiencies with reduced resources. Transactions of the ASAE24(2):301_305.
Ozkan, H.E. and W. Edwards. 1986. A farmer-oriented machinery cost comparison model. Transactions of the ASAE 29(3):672-677.
Ozkan, H.E. 1987. Sprayer performance evaluation with microcomputers. Applied Engineering in Agriculture 3(1):36-41.
Carpenter, T.G., D.L. Reichard, H.E. Ozkan, R.G. Holmes and E. Thornton. 1988. Computerized weighing system for analysis of nozzle spray distribution. Transactions of the ASAE 31(2):375-379.
Ozkan, H.E., D.L. Reichard, H.D. Niemczyk, M.G. Klein and H.R. Krueger. 1990. A subsurface point injector applicator for turfgrass insecticides. Applied Engineering in Agriculture 6(1):5-8.
Ozkan, H.E., B. He and R.G. Holmes. 1990. Determining machinery timeliness cost in corn planting using DRAINMOD. Transactions of the ASAE 33(3):718-724.
Ozkan, H.E., D.L. Reichard, H.D. Niemczyk, M.G. Klein and H.R. Krueger. 1990. Subsurface injection of turfgrass insecticides, Pesticide Formulations and Application Systems: 10th volume, ASTM STP 1078, L.E. Bode, J.L. Hazen, and D.G. Chasin Eds., ASTM, Philadelphia. pp. 236-247.
Ozkan, H.E., B. He and R.G. Holmes. 1991. Estimating effects of subsurface drainage and machinery size on returns. Transactions of the ASAE 34(5):1935-1940.
Reichard, DL., H.E. Ozkan and R.D. Fox. 1991. Nozzle wear rates and test procedure. Transactions of the ASAE34(6):2309-2316.
Ozkan, H.E., D.L. Reichard, K.D. Ackerman and J.S. Sweeney. 1992. Effect of nozzle wear on spray characteristics of fan pattern nozzles made from different materials. Pesticide Formulations and Application Systems: 11th Volume, ASTM STP 1112, D.G. Chasin and L.E. Bode, Eds., ASTM, Philadelphia, PA, pp.206-217.
Ozkan, H.E. and K.D. Ackerman. 1992. An automated computerized spray pattern analysis system. Applied Engineering in Agriculture 8(3):325-331.
Ozkan, H.E., D.L. Reichard and K.D. Ackerman. 1992. Effect of orifice wear on spray patterns delivered by fan pattern nozzles. Transactions of the ASAE 35(4):1091-1096.
Ozkan, H.E., D.L. Reichard and J.S. Sweeney. 1992. Droplet size distributions across the fan-patterns of new and worn nozzles. Transactions of the ASAE 35(4):1097-1102.
Almekinders H., H.E. Ozkan, D.L. Reichard, T.G. Carpenter and R.D. Brazee. 1992. Spray deposit patterns of an electrostatic atomizer. Transactions of the ASAE 35(5):1361-1367.
Ozkan, H.E. 1992. A survey on attitudes of applicators toward pesticide waste reduction. Applied Engineering in Agriculture 8(6):771-776.
Almekinders H., H.E. Ozkan, D.L. Reichard, T.G. Carpenter and R.D. Brazee. 1993. Deposition efficiency of air-assisted charged sprays in a wind tunnel. Transactions of the ASAE 36(2):321-325.
Ozkan, H.E., D.L. Reichard, H. Zhu and K.D. Ackerman. 1993. Effect of drift retardant chemicals on spray drift, droplet size and spray pattern. Pesticide Formulations and Application Systems: 13th Volume, ASTM STP 1183, P.D. Berger, B.N. Devisety and F.R. Hall, Eds., American Society for Testing and Materials, Philadelphia, PA, pp. 173-190.
Zhu, H., D.L. Reichard, R.D. Fox, R.D. Brazee and H.E. Ozkan. 1994. Simulation of drift of discrete sizes of water droplets from field sprayers. Transactions of the ASAE 37(5):1401-1407.
Zhu, H., D.L. Reichard, H.E. Ozkan, R.D. Brazee and R.D. Fox. 1995. A mathematical model to predict the wear rate of nozzles with elliptical orifices. Transactions of the ASAE 38(5):1297_1303.
Zhu H., D.L. Reichard, R.D. Fox, H.E. Ozkan and R.D. Brazee. 1995. DRIFTSIM, a program to estimate drift distances of spray droplets. Applied Engineering in Agriculture 11(3):365-369.
Welty, C., S. Alcaraz and H.E. Ozkan. 1995. Evaluating insecticide application techniques to control aphids in vegetable leaf crops. Hort Technology 5(4):317-326.
Zhu H., D.L. Reichard, R.D. Fox, R.D. Brazee and H.E. Ozkan. 1995. Collection efficiency of spray droplets on vertical targets. Transactions of the ASAE 39(2):415-422.
Reichard, D.L., H. Zhu, R.A. Downer, R.D. Fox, R.D. Brazee, H.E.Ozkan and F.R. Hall. 1996. A system to evaluate shear effects on spray drift retardant perfortmance. Transactions of the ASAE 39(6):1993-1999.
Ozkan, H.E., A. Miralles, C. Sinfort, H.Zhu, D.L. Reichard and R.D. Fox.1997. Effect of shielding spray boom on spray deposition and drift. Pesticide Formulations and Application Systems, STP 1328, ASTM, Philadelphia, PA 19103.
Zhu H., R.W. Dexter, R.D. Fox, D.L. Reichard, R.D. Brazee and H.E.Ozkan. 1997. Effect of polymer composition and viscosity on droplet size of recirculated spray solutions. Journal of Agricultural Engineering Research. Vol. 67, pp. 35-45.
Ozkan, H.E., A. Miralles, C. Sinfort, H. Zhu and R.D. Fox. 1997. Shields to reduce spray drift. Journal of Agricultural Engineering Research. Vol. 67, pp. 311-332.
Zhu, H., R.D. Fox, H.E. Ozkan, R.D. Brazee and R.C. Derksen. 1998. A system to determine lag time an mixture uniformity for inline injection sprayers. Applied Engineering in Agriculture 14(2)103-110.
Zhu, H., H.E. Ozkan, R.D. Fox, R.D. Brazee and R.C. Derksen. 1998. Mixture uniformity in supply lines and spray patterns of a laboratory injection sprayer. Applied Engineering in Agriculture 14(3):223-230.
Zhu, H., R.D. Fox, H.E. Ozkan, R.D. Brazee and R.C. Derksen. 1998. Time delay for injection sprayers Transactions of the ASAE 41(3):525-530.
Ozkan, H.E., and K.D. Ackerman. 1998. Instrumentation for measuring mixture variability in sprayer tanks. Applied Engineering in Agriculture 15(1):19-24.
Ozkan, H.E. 1998. Recommendations for pesticide applicator training in the USA based on licensing and training programs in Western Europe. Applied Engineering in Agriculture 15(1):19-24.
Ucar, T., H.E. Ozkan, R.D. Fox, R.D. Brazee and R.C. Derksen. 1999. Criteria and procedures for evaluating particulate agrichemical mixing in sprayers. Transactions of the ASAE 42(3):601-607.
Derksen, R.C., H.E. Ozkan, R.D. Fox, and R.D. Brazee. 1999. Droplet spectra and wind tunnel evaluation of venturi and pre-orifice nozzles. Transactions of the ASAE 42(6):1573-1580.
Ucar, T., H.E. Ozkan, R.D. Fox, R.D. Brazee and R.C. Derksen. 2000. Experimental study of jet agitation effects on agrochemical mixing in sprayer tanks. Journal of Agricultural Engineering Research (75):195-207.
Ucar, T., R.D. Fox, H.E. Ozkan and R.D. Brazee. 2001. Simulation of jet agitation in sprayer tanks: Comparison of predicted and measured water velocities. Transactions of the ASAE 44(2):223-230.
Soboyejo, A.B.O. H.E. Ozkan, J.C. Papritan, and W.O. Soboyejo. 2001. A new multiparameter approach to the prediction of wear rates in agricultural sprayer nozzles. Journal of Testing and Evaluation, pp. 372-379.
Mueller, D.S., A.E. Dorrance, R.C. Derksen, H.E. Ozkan, J.E. Kurle, C.R. Grau, J.M. Gaska, G.L. Hartman, C.A. Bradley, and W.L. Pedersen. 2002. Efficacy of fungicides on Sclerotinia slerotiorum and potential control of Sclerotinaia stem rot on soybean. Plant Disease 86(1):26-31.
Tsay, J., H. E. Ozkan, R. D. Fox, R. D. Brazee. 2002. CFD simulation of moving spray shields.Transactions of the ASAE 45(1):21-26.
Tsay, J. R. D. Fox, H. E. Ozkan, R. D. Brazee, R. C. Derksen. 2002. Evaluation of a pneumatic-shielded spraying system by CFD simulation. Transactions of the ASAE Vol. 45(1):47-54.
Tsay, J., H. E. Ozkan, R. D. Fox, R. D. Brazee. 2002. CFD simulation of mechanical spray shields. Transactions of the ASAE 45 (5):1271-1280.
Krause, C.R., D.L. Reichard, H. Zhu, R.D. Brazee, H.E. Ozkan, R.D. Fox. 2003. Evaluation of fan-pattern spray nozzle wear using scanning electron microscopy. Scanning 25(1):8-11.
Fife, J.P., R.C. Derksen, H.E. Ozkan, P.S. Grewal. 2003. Effects of pressure differentials on the viability and infectivity of entomopathogenic nematodes. Biological Control 27:65-72.
Fox, R.D., R.C. Derksen, J.A. Cooper, C.R. Krause and H.E. Ozkan. 2003. Visual and image system measurement of spray deposits using water sensitive paper. Applied Engineering in Agriculture 19(5):549-552.
Zhu, H., J.W. Dorner, D. L. Rowland, R.C. Derksen, and H. E. Ozkan. 2004. Spray penetration into peanut canopies with hydraulic nozzle tips. Biosystems Engineering 87(3): 9-17.
Fife, J.P., R.C. Derksen, H.E. Ozkan, P.S. Grewal, J.J. Chalmers and C.R. Krause. 2004. Evaluation of a contraction flow field on hydrodynamic damage to entomopathogenic nematodes- a biological pest control agent. Biotechnology and Bioengineering 86(1):96-107.
Fife, J.P., H.E. Ozkan, R.C. Derksen, P.S. Grewal and C.R. Krause. 2005. Viability of a biological pest control agent through hydraulic nozzles. Transactions of the ASAE 48(1): 45-54.
H. Zhu, R. C. Derksen, C. R. Krause, R. D. Fox, R. D. Brazee and H. E. Ozkan. 2005. Effect of solution pH conditions on fluorescence of spray deposition tracers. Applied Engineering in Agriculture 21(3):325-329.
Fife, J.P., H.E. Ozkan, R.C. Derksen and P.S. Grewal. 2006. Using computational fluid dynamics to predict damage of a biological pesticide during passage through a hydraulic nozzle. Biosystems Engineering 94(3):387-396.
H. Zhu, R.C. Derksen, C.R. Krause, H. Guler, C.R. Krause and H.E. Ozkan. 2006. Foliar deposition and off-target loss with different spray techniques in nursery applications. Transactions of the ASAE 49(2)325-334.
H. Zhu, R.D. Brazee, R.C. Derksen, R.D. Fox, C.R. Krause, H.E. Ozkan, K. Losely. 2006. A specially designed air-assisted sprayer to improve spray penetration and air jet velocity distribution inside dense nursery crops. Transactions of the ASAE 49(5)1285 -1294.
Guler, H., H. Zhu, E. Ozkan, R.C. Derksen, and C.R Krause. 2006. Wind tunnel evaluation of drift reduction potential and spray characteristics with drift retardants at high operating Pressure. Journal of ASTM International (JAI) 3 (5): 1-9.
Fife, J.P, H.E. Ozkan, R.E. Derksen, and P.S. Grewal. 2007. Effects of hydraulic agitation of biopesticide viability and temperature increase within a spray system. Applied Engineering in Agriculture 23(4): 405-412.
Guler, H., H. Zhu, H.E. Ozkan, R.C. Derksen, Y. Yu and C.R. Krause. 2007. Spray characteristics and drift reduction potential with air induction and conventional flat fan nozzles. Transactions of the ASABE 50(3):745-754.
Ozkan, H.E. 2008. Technological solutions to problems associated with application of pesticides. Journal of Agricultural Machinery Science 4(2):193-198. https://dergipark.org.tr/en/download/article-file/119080
Derksen, R.C., H. Zhu, H.E. Ozkan, R.B Hammond, A.E Dorrance and A.L. Spongberg. 2008. Determining the influence of spray quality, nozzle type, spray volume, and air-assisted application strategies on deposition of pesticides in soybean canopy. Transactions of the ASABE 51(5):1529-1537.
Zhu, H., R. D. Brazee, R.D. Fox, R.C. Derksen, H.E. Ozkan. 2008. Development of a canopy opener to improve spray deposition and coverage inside soybean canopies: Part 1. Mathematical models to assist opener development. Transactions of the ASABE 51(6):1905-1912.
Zhu, H., R.C. Derksen, H.E. Ozkan, M. E. Reding, C.R. Krause. 2008. Development of a canopy opener to improve spray deposition and coverage inside soybean canopies: Part 2. Opener design with field experiments.Transactions of the ASABE. 51(6):1913-1921.
Yu, Y., H. Zhu, H. E. Ozkan. 2008. Evaporation of Pesticide Droplets under Various Relative Humidity Conditions. Journal of ASTM International 6(1): 1-8.
Jasisnski, J., M.Darr, E. Ozkan and R. Precheur. 2009. Applying imidacloprid via a precision banding system to control striped cucumber beetle (Cleoptera: Chrysomelidae) in cucurbits. Journal of Economic Entomology102(6)2255-2264.
Yu, Y., H. Zhu, H. E. Ozkan, R.C. Derksen and C.R. Krause. 2009. Evaporation and deposition coverage area of droplets containing insecticides and spray additives on hydrophilic, hydrophobic and crabapple leaf surfaces. Transactions of the ASABE 52(1):39-49.
Yu, Y., H. Zhu, J. M. Frantz, M.E. Reding, K.C. Chan, and H. E. Ozkan. 2009. Evaporation and coverage area of pesticide droplets on hairy and waxy leaves. Biosystems Engineering (104):324-334.
Ozkan, E. 2009. Current status and future trends in pesticide application technology. Proceedings of CIGR V conference, Technology and Management to Increase the Efficiency in Sustainable Agricultural Systems, Rosario, Argentina, http://journals.sfu.ca/cigrp/index.php/Proc/article/view/80.
Xu, L., H. Zhu, H. E. Ozkan, W. E. Bagley, R.C. Derksen, C.R. Krause. 2010. Adjuvant effects on evaporation rates and wetted area of droplets on waxy leaves. Transactions of the ASABE 53(1):13-20.
Xu, L., H. Zhu, H. E. Ozkan and H. W. Thistle. 2010. Evaporation rate and wetted area of surfactant-amended water droplets at different locations on waxy leaf surfaces. Biosystems Engineering (106):58-67.
Xu, L., H. Zhu, H.E. Ozkan, W.E. Bagley, and C.R.Krause.2011. Droplet evaporation and spread on waxy and hairy leaves associated with type and concentration of adjuvants. Pest Management Science 67(7):842-851.
Jeon, H.Y., H. Zhu, R.C. Derksen, H.E. Ozkan, C.R. Krause. 2011. Evaluation of Ultrasonic Sensors for the Variable Rate Tree Liner Sprayer Development. Computers and Electronics in Agriculture 213(1):213-221.
Ozkan, H.E., P.A. Paul, R.C., Derksen, and H. Zhu. 2012. Influence of application equipment on deposition of spray droplets in wheat canopy. Aspects of Applied Biology 114: 317-324.
Derksen, R.C., L.A. Canas, C.M. Ranger, M.E. Reding, and H.E.Ozkan. 2012. Implications for pesticide delivery and insecticide selection using chemical analysis of plant tissue and efficacy. Aspects of Applied Biology 114:279-286.
Derksen, R.C., P.A. Paul, H.E. Ozkan, and H. Zhu. 2012. Field Evaluations of Application Techniques for Fungicide Spray Deposition on Wheat and Artificial Targets. Applied Engineering in Agriculture 28(3):325-331.
Guler H., H. Zhu, H.E Ozkan., P. Ling. 2012. Characterization of hydraulic nozzles for droplet size and spray coverage. Atomization and Sprays 22(8):627-645.
Chen, Y., H. Zhu and H.E. Ozkan. 2012. Development of a variable-rate sprayer with laser scanning sensor to synchronize spray outputs to three structures. 2012. Transactions of the ASABE 55(3):773-781.
Chen, Y., H.E. Ozkan, H. Zhu, R.C. Derksen and C.R Krause. 2013. Spray deposition inside tree canopies from a newly developed variable-rate air-assisted sprayer. Transactions of the ASABE 56(6):1263-1272.
Chen, Y, Zhu, H, Ozkan, HE, Derksen, RC, Krause, CR. 2013. Spray Drift and Off-target loss reductions with a precision air-assisted sprayer. Transactions of the ASABE 56(6):1273-1281.
Derksen, R.C, H.E Ozkan, P.A. Paul and H. Zhu. 2014. Plant canopy characteristics effect on spray deposition. Aspects of Applied Biology. Vol. 122, (Jan 2014): 227-235.
Derksen, R.C, J.E Altland, R.B. Oliveira, H.E.Ozkan. 2014. Performance of granular collectors for container plants and a comparison of the influence of canopy type on preemergent herbicide deposits. Applied Engineering in Agriculture (30)2:383-389.
Liu, H, H. Zhu, Y. Shen, Y. Chen, and H.E. Ozkan. 2014. Development of digital flow control system for multi-channel variable-rate sprayers. Transactions of the ASABE 57(1): 273-281.
Zhu, H., R. Rosetta, M.E. Reding, R.H. Zondag, C.M. Ranger, L. Canas, A. Fulcher, R. C. Derksen, H.E. Ozkan and C.R. Krause. 2017. Validation of a laser-guided variable-rate sprayer for managing insects in ornamental nurseries. Transactions of the ASABE 60(2):337-345.
Shen, Y., H. Zhu, H. Liu, Y. Chen., and E. Ozkan. 2017. Development of a laser-guided embedded-computer-controlled air-assisted precision sprayer. Transactions of the ASABE, 60(6):1827-1838.
A. Manandhar, H. Zhu, E. Ozkan, A. Shah. 2019. Techno-economic impacts of using a laser-guided variable-rate spraying system to retrofit conventional constant-rate sprayers. Precision Agriculture. https://doi.org/10.1007/s11119-020-09712-8.
Salcedo, R., H. Zhu, Z. Zhang, Z. Wei, L. Chen, E. Ozkan, and D. Falchieri. 2020. Foliar deposition and coverage on young apple trees with PWM-controlled spray systems. Computers and Electronics in Agriculture. 178: 105794. https://doi.org/10.1016/j.compag.2020.105794
Salcedo, R., H. Zhu, E. Ozkan, D. Falchieri, Z. Zhang, and Z. Wei. 2021. Reducing ground and airborne drift losses in young apple orchards with PWM-controlled spray systems. Computers and Electronics in Agriculture. 189 (2021), 106389. https://doi.org/10.1016/j.compag.2021.106389
Zhu, H., E. Ozkan, R. Salcedo, R., H. Jeon, and D. Falchieri. 2021. Foliar deposition and off-target loss in young apple orchard with PWM-controlled spray systems. Aspects of Applied Biology 147.

Book Chapters

Ozkan, H.E. 1994. Calibrating turfgrass chemical application equipment. In: Handbook of Integrated Pest Management for Turf and Ornamentals, Ed: A.R. Leslie, Lewis Publishers, pp. 143-161.
Ozkan, H.E. 1995. Herbicide application equipment. In: Handbook on weed Management Systems, Chapter 6. Ed: A.E. Smith. Marcel Dekker Inc., pp. 155-216.
Ozkan, H.E. 1995. Herbicide formulations, adjuvants and spray drift management. In: Handbook on weed Management Systems, Chapter 7. Ed: A.E. Smith. Marcel Dekker Inc., pp. 217-244.
Grisso, R., H.E. Ozkan, V. Hofman, A. Womac, R. Wolf, W.C. Hoffman, J. Williford, T. Walco. 2000. Pesticide application equipment. In: Conservation Tillage Systems and Management, 2^nd Edition, Chapter 29, MidWest Plan Service, Ames, IA, pp.235-249.

Extension Publications (peer reviewed)

Ozkan, H.E. and W. Edwards. 1980. Estimating short-term rental rates of farm equipment. Iowa State University Extension Publication AE_2027.
Edwards, W., and H.E. Ozkan. 1980. Machinery capacity and fuel consumption analysis. Iowa State University Extension Publication AE_1099(4)_TI.
Ozkan, H.E. and D.L. Williams. 1981. Storing fuels on the farm. North Central Regional Extension Publication 172.
Ozkan, H.E., J. Chaplin and S.J. Marley. 1981. Farm Scale alcohol production The Iowa State University ethanol distillery. Iowa State University Extension Publication Pm_1010.
Ozkan, H.E. 1981. Facts about fuel alcohol production. Iowa State University Extension publication Pm-1020.
Ozkan, H.E. 1981. Facts about using alcohol in engines. Iowa State University Extension Publication Pm-1021.
Ozkan, H.E. 1983. Spraying equipment: Nozzles. Iowa State University Extension Publication Pm-1101a.
Ozkan, H.E. 1983. Spraying equipment: Pumps. Iowa State University Extension Publication Pm-1101b.
Ozkan, H.E. 1983. Spraying equipment: Tanks and agitators. Iowa State University Extension Publication Pm-1101c.
Ozkan, H.E. 1983. Spraying equipment: Strainers, booms, flow control devices. Iowa State University Extension Publication Pm-1101d.
Ozkan, H.E. and W. Edwards. 1983. Machinery field capacity. Iowa State University Extension Publication CP/AG 1.1.
Ozkan, H.E. and W. Edwards. 1983. Field day requirements. Iowa State University Extension Publication CP/AG 2.1.
Ozkan, H.E. and W. Edwards. 1983. Implement sizing. Iowa State University Extension Publication CP/AG 3.1.
Ozkan, H.E. and W. Edwards. 1983. Tractor sizing. Iowa State University Extension Publication CP/AG 4.1.
Ozkan, H.E. and W. Edwards. 1983. Radial vs. bias-ply tires__An economic comparison. Iowa State University Extension Publication CP/AG 5.1.
Ozkan, H.E. and W. Edwards. 1983. Fuel and lubrication cost. Iowa State University Extension Publication CP/AG 6.1.
Edwards, W. and H.E. Ozkan. 1983. Machinery ownership and operating cost. Iowa State University Extension Publication CP/AG 7.1.
Edwards, W. and H.E. Ozkan. 1983. Custom hire cost. Iowa State University Extension Publication CP/AG 8.1.
Edwards, W. and H.E. Ozkan. 1983. Machinery leasing cost. Iowa State University Extension Publication CP/AG 9.1.
Edwards, W. and H.E. Ozkan. 1983. Total machinery set cost. Iowa State University Extension Publication CP/AG 10.1.
Edwards, W. and H.E. Ozkan. 1983. Machinery ownership vs. leasing cost. Iowa State University Extension Publication CP/AG 11.1
Edwards, W. and H.E. Ozkan. 1983. Machinery ownership vs. custom hiring or renting cost. Iowa State University Extension Publication CP/AG 12.1.
Edwards, W. and H.E. Ozkan. 1983. Machinery replacement year. Iowa State University Extension Publication CP/AG 13.1.
Ozkan, H.E. and J.L. Baker. 1983. Point-injector fertilizer applicator. Iowa State University Extension Publication AE_3011.
Ozkan, H.E. and D.C. Erbach. 1983. ISU punch planter. Iowa State University Extension Publication AE_3010.
Ozkan, H.E. 1983. The ISU instrumented tractor. Iowa State University Extension Publication AE-3012.
Ozkan, H.E. 1984. Spraying equipment: Operating, maintaining, cleaning, storing. Iowa State University Extension Publication Pm-1101e.
Edwards, W. and H.E. Ozkan. 1985. Estimating farm machinery costs. Iowa State University Extension Publication Pm-710.
Ozkan, H.E. 1985. SPRAYCAL--Sprayer calibration. Iowa State University Extension Publication AGS-2. (43 pages.)
Ozkan, H.E. and R.C. Reeder. 1986. Estimating field capacity of farm machines. Ohio Cooperative Extension Service Publication L_360, Ohio State University, Columbus.
Ozkan, H.E. 1986. Boom sprayer calibration. Ohio State University Extension Publication FABE-520, Columbus. https://ohioline.osu.edu/factsheet/fabe-520
Heiligmann, R.B., E. Norland and H.E. Ozkan. 1988. Calibrating boom sprayers for forestry herbicide application. Ohio Cooperative Extension Publication F-21, Ohio State University, Columbus.
Reeder, R.C., H.E. Ozkan, D. Griffin and S.Parsons. 1990. Ridge tillage: An alternative system. Ohio Cooperative Extension Service Publication AEX-505. Ohio State University, Columbus, OH.
Ozkan H.E. 1990. Machinery management programs. Ohio Cooperative Extension Service Publication ECP 123. Ohio State University, Columbus, OH.
Ozkan, H.E. and J.E. Heimlich. 1991. Proper rinsing and disposal of pesticide containers. Ohio Cooperative Extension Service Publication No. CDFS 116, Ohio State University, Columbus.
Ozkan, H.E. and J. Lemon. 1991. SPRAYCAL - sprayer calibration. Ohio Cooperative Extension Service Publication ECP-111, Ohio State University, Columbus.
Ozkan, H.E. 1991. Reducing spray drift. Ohio Cooperative Extension Service Publication 816, Ohio State University, Columbus.
Ozkan, H.E. 1991. Calibrating turfgrass application equipment. Ohio Cooperative Extension Service Publ. 817, Ohio State University, Columbus.
Ozkan, H.E. and M.L. Wilson. 1991. Reducing pesticide waste. Ohio Cooperative Extension Service Publication 819, Ohio State University, Columbus.
Edwards, W.M. and H.E. Ozkan. 1991. Machinery management user's guide. Iowa Cooperative Extension Service, Iowa State University, Ames.
Ozkan, H.E. and A. Berry. 1992. Ohio pesticide applicator survey: Results. Ohio Cooperative Extension Service Publication. Ohio State University, Columbus.
Ozkan, H.E. and A. Berry. 1992. Ohio pesticide applicator survey: Written comments. Ohio Cooperative Extension Service Publication. Ohio State University, Columbus.
Veenhuizen, M.A. and H.E. Ozkan. 1993. On-Farm agrichemical mixing/loading pad. Ohio State University Extension Publication FABE-522, Columbus. https://ohioline.osu.edu/factsheet/fabe-522
Ozkan, H.E. 1998. New nozzles for spray drift reduction. Ohio State University Extension Publication FABE-523, Columbus. https://ohioline.osu.edu/factsheet/fabe-523
Ozkan, H.E. and R.C. Derksen. 1998. Effectiveness of TurboDrop and TurboTeejet nozzles in drift reduction. Ohio State University Extension Publication FABE-524, Columbus. https://ohioline.osu.edu/factsheet/fabe-524
Ozkan, H.E. and H. Zhu. 1998. Effect of major variables on drift distances of spray droplets. Ohio State University Extension Publication FABE-525, Columbus. https://ohioline.osu.edu/factsheet/fabe-525
Beuerlein, J. E., J. B. Eisley, J. W. Johnson, P. E. Lipps, M. M . Loux, H. E. Ozkan, L. H. Rhodes, D. C. Savage, J. M. Stachler, J. A. Steele, R. M. Sulc, J. Taylor, P. R. Thomison, and H. R. Willson. 1998. Corn, Soybean, Wheat and Alfalfa Field Guide. Ohio State University Extension Publication, Bulletin 827, Columbus, OH.
Ozkan, H.E., S. Bretthauer, and M. Miles. Application basics - situation. A.E. Dorrance, M.A. Draper, and D.E. Hershman Eds., Using foliar fgungicides to manage rust. Ohio State University Extension Bulletin SR-2005, Columbus. pp. 30-35.
Zhu, H., R.D. Fox, and H.E. Ozkan. 2005. DRIFTSIM--Predicting drift distances of spray droplets. Ohio State University Extension Publication, Columbus.
Ozkan, H.E. 2016. Spraying recommendations for soybean rust. Ohio State University Extension Publication FABE-526, Columbus. https://ohioline.osu.edu/factsheet/fabe-526
Ozkan, H.E. and A. Womac. 2016. Best management practices for boom spraying. Ohio State University Extension Publication FABE-527, Columbus. https://ohioline.osu.edu/factsheet/fabe-527
Ozkan, E. 2015. Selecting the best nozzle for the job. Ohio State University Extension Publication FABE-528, Columbus.
https://ohioline.osu.edu/factsheet/fabe-528
Ozkan, E. and K. Smith. 2018. Calibrating Boom Sprayers for Forestry Herbicide Application. Ohio State University Extension Publication FABE-529, Columbus. https://ohioline.osu.edu/factsheet/fabe-529
Ozkan, E. 2018. How Much Chemical Product Do I Need to Add to My Sprayer Tank?. Ohio State University Extension Publication FABE-530, Columbus. https://ohioline.osu.edu/factsheet/fabe-530
Ozkan, E. 2020. Proper Calibration and Operation of Backpack and Hand Can Sprayers. Ohio State University Extension Publication FABE-531, Columbus. https://ohioline.osu.edu/factsheet/fabe-531
Ozkan, E. 2020. Best Practices for Effective and Efficient Pesticide Application . Ohio State University Extension Publication FABE-532, Columbus. https://ohioline.osu.edu/factsheet/fabe-532
Ozkan, E. 2021. Selecting the Right Type and Size of Nozzles for Effective Spraying in Orchards and Vineyards. Ohio State University Extension Publication FABE-534, Columbus. https://ohioline.osu.edu/factsheet/fabe-534
Ozkan, E. 2021. Calibration of Orchard and Vineyard Sprayers. Ohio State University Extension Publication FABE-537, Columbus. https://ohioline.osu.edu/factsheet/fabe-537
Ozkan, E. and E. Gill. 2022. Sprayers for Effective Pesticide Application in Orchards and Vineyards. Ohio State University Extension Publication FABE-533, Columbus. https://ohioline.osu.edu/factsheet/fabe-533
Ozkan, E. 2022. Strategies to Minimize Spray Drift for Effective Spraying in Orchards and Vineyards. Ohio State University Extension Publication FABE-535, Columbus. https://ohioline.osu.edu/factsheet/fabe-535
Ozkan, E. 2022. Strategies to Maximize Pesticide Deposit and Coverage for Effective Spraying in Orchards and Vineyards. Ohio State University Extension Publication FABE-536, Columbus. https://ohioline.osu.edu/factsheet/fabe-536
Ozkan, E. 2022. A.dvancements in Technology for Reduction of Pesticides Used in Orchards and Vineyards. Ohio State University Extension Publication FABE-538, Columbus. https://ohioline.osu.edu/factsheet/fabe-538
Ozkan, E. 2022. Best Practices for Effective Spraying In Orchards and Vineyards. Ohio State University Extension Publication FABE-539, Columbus. https://ohioline.osu.edu/factsheet/fabe-539

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