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Haiying Tao

Haiying Tao.
Assistant Professor/Nutrient Management Specialist

Department of Crop & Soil Sciences
245 Johnson Hall
PO Box 646420
Pullman, WA 99164-6420 USA
Phone: 509-335-4389

Farmer’s Network site

Soil Fertility Lab site

Curriculum Vitae (pdf)


Ph.D., Plant/Soil Science, University of Connecticut, 2007
M.S., Agronomy, China Agricultural University, 2002
B.S., Agronomy, China Agricultural University, 1998

Job Opportunities

We are seeking the following talents to join us as graduate students, research associate/technician, or visiting scholar:

  • Precision agriculture
  • Geostatistics
  • Remote sensing
  • Big data statistics/modeling

Current Research Interests

I lead Soil Fertility Laboratory. Our goal is to advance soil health management for WA agricultural systems through research and extension programs. The current research programs:

  • Soil health assessment for Inland Pacific Northwest agricultural production systems
  • Advancing wheat nutrient recommendations using big data collected using precision agricultural technology
  • Studying strategies to address soil acidification issues in Inland Pacific Northwest cropping systems
  • Sustainable residue management for soil conservation, energy production, feedstock for mushroom and pulp industries.
  • Sustainable land application of dairy manure for crop production, environmental conservation, and food safety
  • Best fertility management strategies for wheat and canola


Washington State Farmers Network


The mission of the Washington State Farmers Network is to advance soil and nutrient management, productivity and sustainability, and profit through participatory research and learning.


The Washington State Farmers Network provides farmers and researchers a platform to share information through structured research and education. By conducting large-scale on-farm research trials, researcher can collect large amount of data across different management practices, soils, and climate conditions for developing more robust models. Through many years of on-farm research, the models will be continuous improved, therefore, the uncertainties in our current nutrient management recommendation systems will be continuously reduced. As a result, farmers will receive systematic and continuously improved nutrient management recommendations.


Alege, F.P., G.J. Miito, L.W. Devetter, H. Tao, and P.M. Ndegwa*. 2020. Effect of blending dairy manure compost and canola meal on pellets quality and nutrients concentrations. Transactions of the ASABE. doi: 10.13031/trans.14057

Porter, M., W.L. Pan, W. Schillinger, I. Madsen, and H. Tao*. 2020. Winter canola response to soil and fertilizer nitrogen in semiarid Mediterranean conditions. Agronomy Journal. 112(2):801-814.

Delwiche*, S., H. Tao, R.S. Breslauer, B.T. Vinyard, and S.R. Rausch. 2020. Is it necessary to manage falling number in the field? Agrosystems, Geosciences & Environment. 3(1): e20014.

Breslauer, R.S., D.J. Brown, W.L. Pan, D.R. Huggins, and H. Tao*. 2020. Compact subsoils limit winter wheat rooting depth and soil water depletion. Agronomy Journal. 112(1):81-91. doi: 10.2134/agronj2019.03.0188.

Bullock, D.S., M. Boerngen, H. Tao, B.D. Maxwell, J.D. Luck, L. Shiratsuchi, and N.F. Martin*. 2019. The data-intensive farm management project: changing agronomic research through on-farm precision experimentation. Agronomy Journal. 111:2736-2746. doi: 10.2134/agronj2019.03.0165.

Tao*, H., W.L. Pan and E. Bietila. 2019. Nitrogen mineralization rates in long-term manured fields estimated using lab incubation experiment. Open Access Journal of Environmental and Soil Sciences. 12:480-484. doi: 10.32474/OAJESS.2019.04.000184.

Tao*, H. and D.S. Bullock. 2019. Nitrogen fertility management for wheat yield and quality using digital agriculture technologies. Cereal Foods World. American Association of Cereal Chemists International. 64 (6):1-5.

Wang, K., D.R. Huggins, and H. Tao*. 2019. Rapid mapping of winter wheat yield, protein and nitrogen uptake using remote and proximal sensing. International Journal of Applied Earth Observation and Geoinformation. 82:1-10. doi: 10.1016/j.jag.2019.101921.

Fitria, H. Ruan, S.C. Fransen, A.H. Carter, H. Tao*, and B. Yang*. 2019. Selecting winter wheat for cellulosic ethanol production in the Pacific Northwest, U.S.A. Biomass and Bioenergy. 123:59-69. doi: 10.1016/j.biombioe.2019.02.012.

Tao*, H., W.L. Pan, P. Carter, and K. Wang. 2019. Addition of lignin to lime materials for expedited pH increase and improved vertical mobility of lime in no-till soils. Soil Use and Management. 35:314-322. doi: 10.111/sum.12483.

Tao*, H., T.F. Morris, P. Kyveryga, and J. McGuire. 2018. Factors affecting nitrogen availability and variability in cornfields. Agronomy Journal. 110:1974-1986. doi: 10.2134/agronj2017.11.0631.

Tao*, H., T. F. Morris, B. Bravo-Ureta, R. Meinert. 2014. Factors affecting manure applications as directed by nutrient management plans at four Connecticut dairy farms. Agronomy Journal. 106(4): 1420-1426.

Tao, H., T.F. Morris*, B. Bravo-Ureta, R. Meinert, and J. Neafsey. 2012. Nutrient applications reported by farmers compared with performance-based nutrient management plans. Agronomy Journal. 104(2):437-447. doi: 10.2134/agronj2011.0316.

Tao, H., T.F. Morris*, B. Bravo-Ureta, R. Meinert, K. Zanger, and J. Neafsey. 2010.  A partial budget analysis for phosphorus-based nutrient management plans for Connecticut dairy farms. Agronomy Journal. 102(1):231-240. doi: 10.2134/agronj2009.0157.

Kyveryga*, H. Tao, T.F. Morris, and T.M. Blackmer. 2010. Identification of nitrogen management categories by corn stalk nitrate sampling guided by aerial imagery. Agronomy Journal. 102(3):858-867. doi: 10.2134/agronj2009.0401.

Extension Publications

Tao*, H. and W.L. Pan. 2019. End-of-season corn stalk nitrate-nitrogen test for post-harvest evaluation. WSU Extension Factsheet FS336E. Washington State University, Pullman, WA.

Tao*, H. and W.L. Pan. 2019. End-of-season corn stalk nitrate-nitrogen test for post-harvest evaluation-A cast study. WSU Extension Factsheet TB66E. Washington State University, Pullman, WA.

Tao*, H., W.L. Pan, P. Carter, K. Wang. Nov. 2019. A wheat straw pulping by-product mixed with lime may address soil acidification in no-till fields. WSU Extension Factsheet TB63E. Washington State University, Pullman, WA.

Tao*, H. and C.W. Rogers. Nov. 2019. Nitrogen inhibitors: how do they work to reduce N losses? WSU Extension Factsheet FS333E. Washington State University, Pullman, WA.

Tao*, H., G. Yorgey, D. Huggins, D. Wysocki. 2017. Crop residue management. Pages 125-162. In G. Yorgey and C. Kruger (eds). Advances in Sustainable Dryland Farming in the Inland Pacific Northwest. WSU Extension Bulletin EM108. Washington State University, Pullman, WA.

Borrelli*, K., W.L., Pan, H. Tao, C. Paul, T. Maaz. 2017. Soil Fertility Management, Pages 237-283. In G. Yorgey and C. Kruger (eds). Advances in Sustainable Dryland Farming in the Inland Pacific Northwest. WSU Extension Bulletin EM108. Washington State University, Pullman, WA.

Tao, H*., T.F. Morris, B. Bravo-Ureta, R. Meinert. 2016. Analyzing the implementation of nutrient management plans by farmers: implications for extension education. Journal of Extension. 54(6).


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