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J. L. Rotundo, Tylka, G. L., and Pedersen, P., Source of Resistance Affect Soybean Yield, Yield Components, and Biomass Accumulation in-Infested Fields, Crop science, vol. 50, no. 6, pp. 2565-2574, 2010.
J. Rotundo, Westgate, M., and Tylka, G., Variation in soybean yield and composition: association with soil properties and SCN., 2006.
N. Rogovska, Blackmer, A. M., and Tylka, G. L., Use of Remote Sensing to Study the Effects of Soil pH and Carbonate Content on Soybean Cyst Nematode Population Densities and Soybean Yield., 2007.
N. P. Rogovska, Blackmer, A. M., and Tylka, G. L., Soybean yield and soybean cyst nematode densities related to soil pH, soil carbonate concentrations, and alkalinity stress index, Agronomy journal, vol. 101, no. 5, pp. 1019-1026, 2009.
N. Rogovska, Blackmer, A., and Tylka, G., Soil pH and Carbonates Effects on Soybean Cyst Nematode Population Densities., 2005.
A. Robertson and Tylka, G. L., Building the" Rust Fast Track System" for Identifying Asian Soybean Rust in Iowa, Journal of Extension, vol. 45, no. 3, 2007.
A. E. Robertson, Mueller, D., and Tylka, G. Lee, Corn Diseases. Iowa State University, Extension and Outreach, 2008.
O. Roberts, Leandro, L., Lenssen, A., Robertson, A., and Tylka, G., Good roots, Better Profits. Realize higher yields by managing soybean root health, Iowa, USA: Iowa Soybean Association, 2012.
S. A. A. Rizvi, Yang, X. B., Tylka, G. L., and McGee, D. C., Occurrence of Pythium species isolated diseased soybean seedlings in Iowa soybean fields, Phytopathology, vol. 84, p. 1123, 1994.
D. A. Reynolds, Tylka, G. L., and Martinson, C. A., Effects of swine manure on soybean cyst nematode, Proceeding of National Soybean Cyst Nematode Conference, Orlando, FL, vol. 16, 1999.