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Tyson Brant Raper
Assistant Professor
Cotton and small grain production



(2 mentions)

Soil Testing 
If youíre looking for a healthy garden or green grass, itís good to know the content of your soil. UT Extension offers inexpensive soil tests, and itís all done in a special lab in Nashville.


Recent Publications

Switchgrass Cultivar, Yield, and Nutrient Removal Responses to Harvest Timing Ashworth, A. J., F. L. Allen, J. L. Bacon, C. E. Sams, W. E. Hart, J. F. Grant, P. A. Moore, and D. H. Pote.  2017.  Agronomy Journal, Vol 109(6):1-8. [Abstract]

Nitrogen, Phosphorus, and Potassium Fertilizer effects on Cassava Tuber Yield in the Coastal District of Dondo, Mozambique.  Cuvaca, I. B, N. S. Eash, D. M. Lambert, F. R. Walker, and W. P. Rustrick.  2017.  African Journal of Agricultural Research, African Journal of Agricultural Research, Vol. 12 (42); 3112 Ė 3119. [Abstract]

Selecting Cotton Yield Response Function to Estimate Profit-Maximizing Potassium Fertilization Rates for Cotton Production in Tennessee Harmon, X., C. Boyer, C. O. Gwathmey, J. A. Larson, and R. K. Roberts.  2017.  Journal of Plant Nutrition, 40,11:1547-1556. [Abstract]

Temporal Frequency of Soil Test Information Effects on Returns to Potassium Fertilization in Cotton Production Harmon, X.L., C. Boyer, D. M. Lambert, and J. A. Larson.  2017.  Journal of Agricultural and Applied Economics, 49,2: 251-272. [Abstract]

Cotton and Potassium: Background and the potential of placement to increase efficiency.  Raper, T. B.  2017.  Crops and Soils.

Expanding the harvest window for switchgrass based on phosphorus and potassium remobilization Bacon, J. L., A. J. Ashworth, F. L. Allen, C. E. Sams, D. D. Tyler, W. E. Hart, and J. F. Grant.  2016.  Crop Science, 56:1-8. [Abstract]

Elevated Levels of Potassium in Greenhouse-grown Red Romaine Lettuce Impacts Mineral Nutrient and Soluble Sugar Concentrations.  Barickman, T. C., T. E. Horgan, J. R. Wheeler, and C. E. Sams.  2016.  HortScience, 51(9):504-509. [Abstract]

Effect of biochar on nutrient release and retention in container crops.  Basiri, N., F. R. Walker, A. Fulcher, and J. Altland.  2016.  Proceedings of Southern Nursery Association Research Conference, 61:174-180. [Abstract]

Comparing the Value of Soil Test Information Using Deterministic and Stochastic Yield Response Plateau Functions Harmon, X., C. Boyer, D. M. Lambert, J. A. Larson, and C. O. Gwathmey.  2016.  Journal of Agricultural and Resource Economics, 41(2): 307-323. [Abstract]

Potassium and phosphorus effects on disease severity of Charcoal Rot of soybean.  Mengistu, A., X. Yin, N. Bellaloui, M. A. McClure, D. D. Tyler, and K. N. Reddy.  2016.  Canadian J. Plant Pathology, 38:174-182.

Crop and soil response from phosphorus and potassium fertilizer rate verification for the state of Tennessee.  Savoy, H. J., S. Jagadamma, X. Yin, and D. K. Joines.  2016.  ASA-CSSA-SSSA International Annual Meeting. Phoenix, AZ. Nov 5-9.

Temporal Frequency of Soil Test Information Effects on Returns to Potassium Fertilization in Cotton Production.  X.L. Harmon, C. Boyer, D. M. Lambert, and J. A. Larson.  2016.  Southern Agricultural Economics Association annual meeting,, San Antonio, TX. February 6-9, 2016.