Meet the UMCA Faculty and Staff

Harold E. "Gene" Garrett, Ph.D.

203 ABNR, Forestry
Columbia, MO 65211
(573) 882-3647
garretth@missouri.edu

Research interests are focused on the biological interactions between trees and companion crops as they relate to the design of agroforestry practices. Areas of interest include Alley Cropping, Silvopasturing, Riparian Buffers and Forest Farming. In particular, research emphasizes the combining of trees and companion crops to optimize economic and environmental benefits.

Publications

• Lin, C.-H., R.N. Lerch, K.W. Goyne, and H.E. Garrett. 2011. Reducing herbicides and veterinary antibiotic losses from agroecosystems using vegetative buffers. J. Environ. Qual. 40:791-799.
• Lin, C.H., R.N. Lerch, R.J. Kremer, H.E. Garrett and M.F. George 2011. Stimulated rhizodegradation of atrazine by selected plant species. Journal of Environmental Quality 40: 1113-1121.
• Lin, C.H., K.W., Goyne, R.J. Kremer, R.N. Lerch, and H.E. Garrett. 2010. Dissipation of sulfamethazine and tetracycline in the root zone of grass and tree species. Journal of Environmental Quality 39:1269-1278.
• Thompson, B.M., C.H. Lin, H.Y. Hsieh, R.J. Kremer, R.N. Lerch, and H.E. Garrett. 2010. Evalu-ation of PCR-based quantification techniques to estimate the abundance to atrazine chlorohydrolase gene atzA in rhizosphere soils. Journal of Environmental Quality 39:1999-2005.
• Udawatta, R.P., H.E. Garrett, and R.L. Kallenbach. 2010. Agroforestry and grass buffer effects on water quality in grazed pastures. Agroforestry Systems 79:81-87.
• Anderson, S.H., R.P. Udawatta, T. Seobi, and H.E. Garrett. 2009. Soil water content and infiltration in agroforestry buffer strips. Agrofor. Syst. 75:5-16.
• Garrett, H.E. (ed.). 2009. North American Agroforestry: An Integrated Science and Practice. 2nd Edition. Agronomy Society of America, Madison, Wis.
• Garrett, H.E., R.L. McGraw, and W.D. Walter. "Alley cropping practices." In Garrett, H.E. (ed.). 2009. North American Agroforestry: An Integrated Science and Practice. 2nd Edition. Agronomy Society of America, Madison, Wis. Chapter 7.
• Gold, M.A., and H.E. Garrett. "Agroforestry nomenclature, concepts, and practices." In Garrett, H.E. (ed.). 2009. North American Agroforestry: An Integrated Science and Practice. 2nd Edition. Agronomy Society of America, Madison, Wis. Chapter 3.
• Lerch, R.N., C.H. Lin, and H.E. Garrett. "Utilizing vegetative buffer strips to remove dissolved and sediment-bound herbicides from surface runoff." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 41-42.
• Lin, C.H., R.N. Lerch, H.E. Garrett, and M.F. George. 2008. Bioremediation of atrazine-contaminated soil by forage grasses: Transformation, uptake, and detoxification. J. Environ. Qual. 37: 196-206.
• Lin, C.H, K.W. Goyne, R.J. Kremer, R.N. Lerch, and H.E. Garrett. "Rhizodegradation of sulfamethazine and tetracycline and the associated impacts on soil microbial activities." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 349-358.
• Lin, C.H., B.M. Thompson, H.Y. Hsieh, R.N. Lerch, R.J. Kremer, and H.E. Garrett. "Introduction of atrazine-degrading Pseudomonas sp. strain ADP to enhance rhizodegradation of atrazine." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 183-190.
• Lin, C.H., W.D. Walter, H.E. Garrett, and R.N. Lerch. "Controlling swine odor with natural windbreak." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 339-348.
• Lin, C.H., B.M. Thompson, H.Y. Hsieh, R.J. Kremer, R.N. Lerch, and H.E. Garrett. "Introduction of atrazine-degrading Pseudomonas sp. strain ADP to enhance phytoremediation of atrazine." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 183-190.
• Lin, C.H, K.W. Goyne, R.J. Kremer, R.N. Lerch, A.L. Spohn, and H.E. Garrett. "Rhizodegradation of sulfamethazine and tetracycline and the associated impacts on soil microbial activities." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 349-358.
• Reid, W., M.V. Coggeshall, H.E. Garrett, and J.W. Van Sambeek. 2009. Growing black walnut for nut production. (Revised.) University of Missouri Center for Agroforestry. "Agroforestry in Action." AF1011-2009. 16p.
• Udawatta, R.P., R.J. Kremer, H.E. Garrett, and S.H. Anderson. 2009. Soil enzyme activities and physical properties in a watershed managed under agroforestry and row-crop system. Agric. Ecosyst. Environ. 131:98-104.
• Udawatta, R.P., H.E. Garrett, and R.L. Kallenbach. "Agroforestry and grass buffer effects on water quality on grazed pasture watersheds." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 173-182.
• Udawatta, R.P., S.H. Anderson, P.P. Motavalli, and H.E. Garrett. "Agroforestry interactions and soil water use by corn-soybean watersheds." In M.A. Gold and M.M. Hall (eds.). 2009. Agroforestry Comes of Age: Putting Science into Practice. Proceedings, 11th North American Agroforestry Conference. 203-211.
• Udawatta, R.P., C.J. Gantzer, S.H. Anderson, and H.E. Garrett. 2008. Agroforestry and grass buffer effects on high resolution X-ray CT-measured pore characteristics. Soil Sci. Soc. Am. J. 72:295-304.
• Coggeshall, M.V., J.W. Van Sambeek, and H.E. Garrett. 2008. Grafting influences on early acorn production in swamp white oak (Quercus bicolor Willd.) In: Jacobs, D.E., and others, eds. Proceedings, Sixteen Central States Forest Conference. April 7-10; West Lafayette, IN. Gen. Tech. Rep. NRS-__. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. In press.
• Udawatta, R.P., S.H. Anderson, C.J. Gantzer, and H.E. Garrett. 2008. Influence of prairie restoration on CT-measured soil pore characteristics. Journal of Environmental Quality 37: 219-228.
• Reid, W., M.V. Coggeshall, and H.E. Garrett. 2007. Growing black walnut for nut production. University of Missouri Center for Agroforestry. "Agroforestry in Action" publication. 16p.
• Lin, C.H, K.W. Goyne, R.J. Kremer, R.N. Lerch, A.L. Spohn, and H.E. Garrett. 2007. Rhizodegradation of sulfamethazine and tetracycline and the associated impacts on soil microbial activities. Nov. 4-8, ASA-CSSA-SSSA International Annual Meetings in New Orleans, La. Abstract.
• Lin, C.H., R.N. Lerch, H.E. Garrett, and M.F. George. 2007. Ability of forage grasses exposed to Atrazine and Isoxaflutole (Balance™) to reduce nutrient levels in soils and shallow groundwater. Communications in Soil Science and Plant Analysis 38: 1119–1136.
• Lin, C.H., R.N. Lerch, H.E. Garrett, C.J. Gantzer, and S.H. Anderson. 2007. Utilizing vegetative buffer strips to remove dissolved and sediment-bound atrazine, metolachlor and glyphosate from surface water runoff. In: Olivier, A., and S. Campeau, eds. Proceedings of the 10th North American Agroforestry Conference, Quebec City, Quebec, June 10-13. p. 113-121.
• Lin, C.H., R.N. Lerch, H.E. Garrett, and M.F. George. 2007. An improved GC-MS/MS method for determination of atrazine and its chlorinated metabolites uptake by forage plants-laboratory and field experiments. Communications in Soil Science and Plant Analysis 38: 1753-1773.
• Lin, C.H., R.N. Lerch, H.E. Garrett, Y.X. Li, and M.F. George. 2007. An improved HPLC-MS/MS method for determination of isoxaflutole (Balance™) and its metabolites in soils and forage plants. Journal of Agricultural and Food Chemistry 55: 3805–3815.
• Lin, C.H., R.N. Lerch, R.J. Kremer, H.E. Garrett, and M.F. George. 2007. Stimulated rhizodegradation of atrazine by selected plant species. Fourth International Conference on Phytotechnologies, Sept. 24-26, Denver, Colo. Abstract.
• Lin, C.H., R.N Lerch., R.J. Kremer, H.E. Garrett, and M.F. George. 2007. Stimulated rhizodegradation of atrazine by selected plant species. In: Olivier, A., and S. Campeau, eds. Proceedings of the 10th North American Agroforestry Conference, Quebec City, Quebec, June 10-13. p. 95-105.
• Lin, C.H., B.M. Thompson, H.Y. Hsieh, R.J. Kremer, R.N. Lerch, and H.E. Garrett. 2007. Introduction of atrazine-degrading Pseudomonas Sp. Strain ADP to enhance phytoremediation of atrazine. Nov. 4-8, ASA-CSSA-SSSA International Annual Meetings in New Orleans, La. Abstract.
• Lin, C.H., J. Yang, R.N. Lerch, A.L. Spohn, and H.E. Garrett. 2007. Enhanced rhizodegradation of munitions explosives TNT and RDX by selected grass species. Nov. 4-8, ASA-CSSA-SSSA International Annual Meetings in New Orleans, La. Abstract.
• Lin, C.H., J. Yang, R.N. Lerch, A.L. Spohn, and H.E. Garrett. 2007. Enhanced rhizodegradation of munitions explosives TNT and RDX by selected grass species. Fourth International Conference on Phytotechnologies, Sept. 24-26. Denver, Colo. Abstract.
• Udawatta, R.P., S.H. Anderson, P.P. Motavalli, and H.E. Garrett. 2007. Soil water dynamics under agroforestry and grass buffers. Agronomy Abstracts 2007. Annual Meetings, New Orleans, La., Nov. 4-8. American Society of Agronomy, 677, South Segoe Road, Madison, WI 53711. Abstract.
• Udawatta, R.P., R.J. Kremer, H.E. Garrett, and S.H. Anderson. 2007. Soil aggregate stability and enzyme activity in agroforestry and row-cropping systems. In: Olivier, A., and S. Campeau, eds. Proceedings of the 10th North American Agroforestry Conference. Quebec City, Quebec, June 10-13. p. 165-175. Abstract.
• Godsey, L.D., W.D. Walter, J.P. Dwyer, and H.E. Garrett. 2007. A preliminary economic analysis of silvopasture in Missouri’s Ozark forests. In: Buckley, D.S., and W.K. Clatterbuck, eds. Proceedings of 15th Central Hardwood Forest Conference. e-Gen. Tech. Rep. SRS-101. U.S. Department of Agriculture, Forest Service, Southern Research Station. p. 418-424.
• Udawatta, R.P., S.H. Anderson, C.J. Gantzer and H.E. Garrett. 2006. Agroforestry and grass buffer influence on macropore characteristics: A computed tomography analysis. Soil Sci. Soc. Am. J. 70:1763-1773.
• Udawatta, R.P., P.P. Motavalli, H.E. Garrett, and J.J. Krstansky. 2006. Nitrogen losses in runoff from three adjacent agricultural watersheds with claypan soils. Journal of Environmental Quality. 17:39-48.
• Anderson, S.H., R.P. Udawatta, T. Seobi and H.E. Garrett. 2005. Soil water content and infiltration in agroforestry buffer strips. pp. 1-17. In: K.N. Brooks and P.F. Ffolliott (eds.) Moving Agroforestry Into the Mainstream. The 9th North American Agroforestry Conference Proceedings, June 12-15, 2005, St. Paul, Minnesota. Dept. of Forest Resources, University of Minnesota, St. Paul, MN. [non-paginated CD-ROM].
• Lin, C.H., R.N. Lerch, H.E. Garrett and M.F. George. 2005. Incorporating forage grasses in riparian buffers for bioremediation of atrazine, isoxaflutole and nitrate in Missouri. Agroforestry Systems 63:87-95.
• Lin, C.H., Lerch, R.N., Garrett, H.E. and George, M.F. 2005. Soil microbiological activities in vegetative buffer strips and their association with herbicides degradation. pp. 1-10. In: K.N. Brooks and P.F. Ffolliott (ed.) Moving Agroforestry Into the Mainstream. The 9th North American Agroforestry Conference Proceedings, June 12-15, 2005, St. Paul, Minnesota. Dept. of Forest Resources, University of Minnesota, St. Paul, MN. [non-paginated CD-ROM].
• Udawatta, R.P., S.H. Anderson and H.E. Garrett. 2005. Tree, grass and crop root length densities and soil water content within an agroforestry buffer system. pp. 1-16. In: K.N. Brooks and P.F. Ffolliott (eds.) Moving Agroforestry Into the Mainstream. The 9th North American Agroforestry Conference Proceedings, June 12-15, 2005, St. Paul, MN. Dept. of Forest Resources, University of Minnesota, St. Paul, MN [non-paginated CD-ROM].
• Udawatta, R.P., P. Nygren, H.E. Garrett. 2005. Growth of three oak species during establishment in an agroforestry practice for watershed protection. Canadian Journal of Forest Research 35:602-609.
• Garrett, H.E., M.S. Kerley, K.P. Ladyman, W.D. Walter, L.D. Godsey, J.W. Van Sambeek and D.K. Brauer. 2004. Hardwood silvopasture management in the central hardwood region, USA. Agroforestry Systems 61:21-33.
• Garrett, H.E., M.S. Kerley, K.P. Ladyman, W.D. Walter, L.D. Godsey, J.W. VanSambeek and D.K. Brauer. 2004. Hardwood silvopasture management. In: Nair, P.K.R., Rao, M.R. and Buck. L.E. (eds.) New Vistas in Agroforestry: A compendium for the 1st World Congress of Agroforestry. Kluwer, Dordrecht, The Netherlands. pp. 21-33.
• Godsey, L.D., W.D. Walter and H.E. Garrett. 2004. Effects of girdling on black walnut wood color. In: Proceedings 14th Central Hardwood Forest Conference. (ed. Yaussy et al.) March 17-19, 2004. Wooster, OH. Gen. Tech. Rep. NE-316. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. pp. 389-394.
• Godsey, L.D. W.D. Walter and H.E. Garrett. 2004 Girdling eastern black walnut for increased heartwood formation. In: Proceedings 6th Walnut Research Symposium (ed. C. Michler et al.). West Lafayette, Indiana. Gen. Tech. Rep. NC-243. pp. 101-105.
• Kluthe, J., L. Godsey and H.E. Garrett. 2004 Forest farming: Ferns as a companion crop. Proceedings of the 8th North American Agroforestry Conference, June 22-25, 2003, Corvallis, OR pp. 154-158.
• Ladyman, K.P., M.S. Kerley, R.L. Kallenbach, H.E. Garrett, J.W. Van Sambeek and N.E. Navarrete-Tindall. 2004. Quality and quantity evaluations of shade grown forages. In: Proc. Eighth Biennial Conf. on Agroforestry in North America. 22-25 June 2003. Corvallis, OR. pp. 175-181.
• Lin, C.H., R.N. Lerch, H.E. Garrett and M.F. George. 2004. Incorporating forage grasses in riparian buffers designed for bioremediation of atrazine, (isoxaflutole) and nitrate in Missouri. Agroforestry Systems 63:91-99.
• Lin, C.H., R.N. Lerch, D. Jordan, H.E. Garrett and M. George. 2004. The effects of herbicides (atrazine and Balance) and ground covers on microbial biomass carbon and nitrate reduction. In: Proceedings of the 8th North American Agroforestry Conference, June 22-25, 2003 Corvallis, Oregon. pp. 182-195.
• Shockley, F.W., R.L. McGraw and H.E. Garrett. 2004. Growth and nutrient concentration of two native forage legumes inoculated with rhizobium and mycorrhiza in Missouri, USA. Agroforestry Systems 60:137-142.
• Udawatta, R.P., P. Motavalli and H.E. Garrett. 2004. Phosphorus loss and runoff characteristics in three adjacent agricultural watersheds with claypan soils. J. of Environmental Quality 33:1709-1719.
• Van Sambeek, J.W. and H.E. Garrett. 2004. Ground cover management in walnut and other hardwood plantings. In: Proceedings, 6th Walnut Research Symposium. (ed. C. Michler, et al.) July 25-28, 2004. West Lafayette, IN. USDA Forest Service Gen. Tech. Rep. NC-243. pp. 85-100.
• Walter, W.D., H.E. Garrett and L.D. Godsey. 2004. Response of eastern black walnut to herbicide stump treatment. In: Proceedings 14th Central Hardwood Forest Conference. (ed. Yaussy et al.) March 17-19, 2004. Wooster, Ohio. Gen. Tech. Rep. NE-316. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. pp. 52-55.
• Walter, W.D., H.E. Garrett and L.D. Godsey. 2004. Use of herbicides to reduce stump-sprouting following thinning of an eastern black walnut agroforestry planting. In: Proceedings 6th Walnut Research Symposium. (ed. C. Michler et al.) July 25-28, 2004. West Lafayette, Indiana. Gen. Tech. Rep. NC-243. pp. 106-109.
• Brookshire, B.L., H.E. Garrett and T.L. Robison. 2003. Effects of vesicular-arbuscular mycorrhizae and seed source on nursery-grown Juglans nigra L. seedlings. In: Dawson, J.O. (ed.), 13th Central Hardwood Forest Conference. April 1-3, 2002 Urbana-Champaign, IL. USDA For. Serv., Gen. Tech. Rep. NC-234. pp. 468-475.
• Garrett, H.E. 2003. Agroforestry for small farms. Building on a Time to Act, An advisory document to the Secretary of Agriculture, Ann M. Veneman, from the USDA Advisory Committee on Small Farms. Miscellaneous Publication No. 286 (MP 286), USDA, Washington, D.C. pp. 11-12.
• Garrett, H.E. 2003. Small farm, environmental and conservation incentives. Building on a Time to Act, An advisory document to the Secretary of Agriculture, Ann M. Veneman, from the USDA Advisory Committee on Small Farms. Miscellaneous Publication No. 286 (MP 286), USDA, Washington, D.C. pp. 13-15.
• Garrett, H.E. 2003. Roles for agroforestry in hardwood regeneration and natural-stand management. (Keynote Address). In: Dawson, J.O. (ed.), 13th Central Hardwood Forest Conference. April 1-3, 2002 Urbana-Champaign, IL. USDA For. Serv., Gen. Tech. Rep. NC-234. pp. 33-43.
• Gray, D.E., S.G. Pallardy, H.E. Garrett and G.E. Rottinghaus. 2003. Effect of acute drought stress and time of harvest on phytochemistry and dry weight of St. John's wort leaves and flowers. Planta Medica 69:1024-1030.
• Gray, D.E., H.E. Garrett, S.G. Pallardy, and G.E. Rottinghous. 2003. An introduction to incorporating botanicals into alley cropping practices. In: Land-Use Management for the Future (T.R. Clason, ed.) Proceedings 6th North American Conference on Agroforestry. Hot Springs, AR. June 14-16, 1999 pp. 203-212.
• Gray, D., S.G. Pallardy, H.E. Garrett and G.E. Rottinghous. 2003. Acute drought stress and root age effects on alkamide and phenolic acid content in purple coneflower roots. Planta Medica 69:50-55.
• Lehmkuhler, J. E.E.D. Felton, D.A. Schmidt, K.J. Bader, H.E. Garrett and M.S. Kerley. 2003. Tree protection methods during the silvopasture-system establishment in Midwestern USA: Cattle performance and tree damage. Agroforestry Systems 59:35-42.
• Lin, Chung-Ho, R.N. Lerch, H.E. Garrett and M.F. George. 2003. Degradation of isoxaflutole (Balance) herbicide by hypochlorite in tap water. Journal of Agricultural and Food Chemistry 51:8011-8014.
• Lin, C.H., Lerch, R.N., Johnson, W.G., Jordan, D., Garrett, H.E. and George, M.F. 2003. The effect of five forage species on transport and transformation of atrazine and Balance (isoxaflutole) in lysimeter leachate. Journal of Environmental Quality 32:1992-2000.
• Lin, C.H., R.L. McGraw, M.F. George, H.E. Garrett. 2003. Shade effects on quality and morphological development of forage crops with potential in temperate agroforestry practices. In: Land-Use Management for the Future (T.R. Clason, ed.) Proceedings 6th North American Conference on Agroforestry. Hot Springs, AR. June 14-16, 1999 pp. 127-139.
• Gray, D., S.G. Pallardy, H.E. Garrett and G.E. Rottinghaus. 2002. Acute drought stress and root age effects on alkamide and phenolic acid content in purple coneflower roots. Planta Medica.
• Lin, C.H., R.N. Lerch, H.E. Garrett, E.M. Thurman and M.F. George. 2002. Determination of Balance (isoxaflutole) and its metabolites in water using high-performance liquid chromatography with UV or mass spectrometry. Journal of Agricultural Food and Chemistry.
• Stamps, W.T., T.L. Woods, M.J. Linit and H.E. Garrett. 2002. Arthropod diversity in an alley cropping practice: Arthropod and forage effects on eastern black walnut trees. Agroforestry Systems.
• Udawatta, R.P., J.J. Krstansky, G.H. Henderson and H.E. Garrett. 2002. Agroforestry practices, runoff and nutrient loss: A paired watershed comparison. Journal of Environmental Quality. 31:1214- 1225.
• Gray, D., C.A. Roberts, G.E. Rottinghaus, H.E. Garrett and S.G. Pallardy. 2001. Quantification of root chicoric acid in purple coneflower by near infrared reflectance spectroscopy. Crop Sci. 41:1159-1161.
• Lin, C.H., R.L. McGraw, M.F. George and H.E. Garrett. 2001. Shade effects on quality and morphological development of forage crops with potential in temperate agroforestry practices. Agroforestry Systems 53:269-281
• Garrett, H.E. and R.L. McGraw. 2000. Alley cropping. In: North American Agroforestry: An Integrated Science and Practice (H.E. Garrett, W.J. Rietveld and R.F. Fisher, eds.). Agronomy Society of America, Madison, WI. pp. 149-188.
• Garrett, H.E., W.J. Rietveld and R.F. Fisher (eds.). 2000. North American Agroforestry: An Integrated Science and Practice. Agronomy Society of America, Madison, WI, 402 p.
• Gold, M.A., W.J. Rietveld, H.E. Garrett and R.F. Fisher. 2000. Agroforestry concepts and nomenclature in the United States. In: North American Agroforestry: An Integrated Science and Practice (H.E. Garrett, W.J. Rietveld and R.F. Fisher, eds.). Agronomy Society of America, Madison, WI. pp. 63-77.
• Gray, D.E., G.E. Rottinghaus, H.E. Garrett and S.G. Pallardy. 2000. Simultaneous determination of the predominant hyperforins and hypericins in St. Johns wort (Hypericum perforatum L.) by liquid chromatography. International J. of the Association of Official Analytical Chemists. 84(4):944-949.
• Alley, J.L., H.E. Garrett, R.L. McGraw, J.P. Dwyer and C.A. Blanche. 1999. Forage legumes as living mulches for trees in agroforestry practices. Agroforestry Systems. 44:281-291.
• Garrett, H.E. and L.S. Harper. 1999. The science and practice of black walnut agroforestry in Missouri, USA: A temperate zone assessment. In: Agroforestry in Sustainable Agricultural Systems (L.E. Buck, J.P. Lassoie and E.C.M. Fernandes, eds.) CRC Press, New York, NY. pp. 97-110.
• Garrett, H.E. and J.E. Jones. 1999. Companion crop recommendations for black walnut. Chapter 17. In: Nut Production Handbook for Eastern Black Walnut. (J.E. Jones, R. Mueller and J.W. Van Sambeek, eds.) Southwest RC&D, Springfield, MO. pp. 102-106. .
• Gray, D. and H.E. Garrett. 1999. Nitrogen form and timing of application: Effects on black walnut fruit yield components under alley cropping. Agroforestry Systems. 44:333-334.
• Lehmkuhler, J.W., M.S. Kerley, H.E. Garrett, R.L. McGraw and B.E. Cutter. 1999. Comparison of continuous and rotational silvopastoral systems for established walnut plantations. Agroforestry Systems. 44:267-279.
• Lin, C.H., R.L. McGraw, M.F. George and H.E. Garrett. 1999. Shade effects on forage crops with potential in temperate agroforestry practices. Agroforestry Systems. 44:109-119.
• Ponder, F., J.E. Jones and H.E. Garrett. 1999. Black walnut nutrition. Chapter 19. In: Nut Production Handbook for Eastern Black Walnut (J.E. Jones, R. Mueller and J.W. Van Sambeek, eds.). Southwest RC&D, Springfield, MO. pp. 112-119.
• Van Sambeek, J.E., H.E. Garrett and J.E. Jones. 1999. Ground covers to maximize ease of management, tree vigor and harvest. Chapter 18. In: Nut Production Handbook for Eastern Black Walnut (J.E. Jones, R. Mueller and J.W. Van Sambeek, eds.). Southwest RC&D, Springfield, MO. pp 107-111.