Santosh  Shiwakoti


My published papers can be downloaded from my personal webpage

Degree Level

Doctorate (PhD)
Santosh Shiwakoti
Doctoral Candidate

417 Crop Science Building

Department of Crop and Soil Science
Crop Science


My research is focussed on some of the Long-Term Experiments (LTEs) at Columbia Basin Agriculture Research Center (CBARC), Pendleton, OR. I am studying long-term effects of agricultural practices (crop residue incorporation, organic and inorganic amendments,  tillage types, and tillage intensities on plant and soil nutrients (nitrogen, phosphorus, potassium, sulfur, carbon, magnesium, manganese, copper, iron, molybdenum, sodium, and zinc) in dryland winter wheat cropping system. I will be analyzing soil and wheat (grain and straw) samples from 1995, 2005, and 2015 and compare it with the undisturbed grassland plots' soil samples from those years. My primary research question is whether all the above-mentioned practices are sustainable for a long term winter wheat production or not. Nutrients are one of the prime indicators of a good soil quality, and hence it is necessary to elucidate the dynamics of nutrients over the time influenced by the different agricultural practices.

I started my Ph.D. degree at University of Wyoming (UW) in 2013 and transferred to OSU in 2015. During my brief UW time, I conducted field research on mints (spearmints, peppermints, Japanese corn mints). My another research was on three different types of season extension methods (low tunnel, high tunnel and low tunnel in a high tunnel) of vegetables and herbs production for Wyoming conditions.

During my MS at Auburn University, AL, I did field and greenhouse research on American skullcap (Scutellaria lateriflora) and its flavonoid contents under the supervision of Dr. Dennis A. Shannon


Oregon State University, Corvallis, OR: Ph.D (In progress)

University of Wyoming, Laramie, WY: Ph.D (Transferred to OSU in 2015)

Auburn University, Auburn, AL: M.S. (2011)

Arava International Center for Agriculture Training (AICAT), Israel: Diploma (2007)

Tribhuvan University, Kathmandu, Nepal: B.Sc. (2005)



Shiwakoti, S., O. Saleh, S. Poudyal, A. Barka, Y. Qian, and V.D. Zheljazkov. 2016. Yield, Composition and Antioxidant Capacity of the Essential Oil of Sweet Basil and Holy Basil as Influenced by Distillation Methods. Chemistry and Biodiversity. 14 (4) e1600417. DOI: 10.1002/cbdv.201600417. Link.

Shiwakoti, S., V. D. Zheljazkov, V. Schlegel, and C. L. Cantrell. 2016. Growing spearmint, thyme, oregano, and rosemary in northern Wyoming using plastic tunnels. Industrial Crops and Products. 94: 251-258. Link.

Shiwakoti, S., D. Shannon, C. W. Wood, N. Joshee, K. Lawrence, B. Kemppainen and A. Rimando. 2016. Nitrogen, Phosphorus and Potassium Effects on Biomass Yield and Flavonoid Content of American Skullcap (Scutellaria lateriflora). Journal of Plant Nutrition. 39: 1240-1249. Link.

Shiwakoti, S., S. Poudyal, O. Saleh, T. Astatkie, and V.D. Zheljazkov. 2016. Method for attaining caraway seed oil fractions with different composition. Chemistry & Biodiversity. 13: 695-699.  Link.

Shiwakoti, S., V. D. Zheljazkov, and V. Schlegel. 2016.  Cool-season vegetables can be grown in northern Wyoming with season-extension methods of tunnels. Submitted to Horticultural Science.

Zheljazkov, V.D., S. Shiwakoti, T. Astatkie, I. Salamon, D. Grulova, S. Mudrencekova, and V. Schlegel. 2015. Yield, composition, and antioxidant capacity of ground cumin seed oil fractions obtained at different time points during the hydrodistillation. HortScience. 50: 1213-1217. Link.

Shiwakoti, S., H. Y. Sintim, S. Poudyal, J. Buffalo, C.L. Cantrell, T.Astatkie, E. Jeliazkova, L. Ciampa, and V. D. Zheljazkov. 2015. Diurnal effects on Mentha Canadensis oil yields and composition. HortScience. 50: 85-89. Link.

Zheljazkov, V.D., T. Astatkie, S. Shiwakoti, S. Poudyal, T. Horgan, N. Kovatcheva, A. Dobreva. 2014. Essential Oil Yield and Composition of Garden Sage as a Function of Different Steam Distillation Times. HortScience. 49: 785-790. Link.

‚ÄčShiwakoti S., D. Shannon, C. W. Wood, N. Joshee, K. Lawrence, B. Kemppainen, and A. Rimando. 2013. Harvesting Number and Timing Effects on Shoot Yield and Flavonoid Content in Organically Grown American Skullcap (Scutellaria lateriflora). Journal of Herbs, Spices & Medicinal Plants. 19:248–261. Link.



Zheljazkov, V. D., S. Shiwakoti, E. A. Jeliazkova, and T. Astatkie. 2016. Chemical profile and bioactivity of essential oil fractions as a function of distillation time, p. 145-166. In: Jeliazkov (Zheljazkov), V.D. and C.L. Cantrell (eds.). Medicinal & Aromatic Crops: Production, Phytochemistry, & Utilization. American Chemical Society Symposium Series. ACS publications. Washington D.C. U.S.A. Link.


Awards and Honors

J. Ritchie Cowan Memorial Fellowship (2017), Department of Crop and Soil Science, Oregon State University

Phi Kappa Phi , Member of OSU chapter since 2016.

Outstanding member award (2011) by Nepalese Student Association at Auburn University, Auburn, AL.

Merit scholarship (2000-2004) from Tribhuvan University, Nepal.