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United States Department of Agriculture

Agricultural Research Service

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Ruijun Qin
Visiting Scientist in Soil Science and Agronomy

USDA-ARS Water Management Research Unit
9611 South Riverbend Avenue
Parlier, California 93648-9757
(559) 596-2904

Dr. Ruijun Qin is a visiting scientist at the USDA-ARS in WMRU and an assistant project scientist at the Department of Plant Sciences, UC Davis. Before coming to the US, Dr. Qin had studied and worked at the Swiss Federal Institute for Forest, Snow and Landscape Research on poplar root physiology under Al, Zn, and Cu stress.  At the Swiss Federal Institute of Technology Zurich  Dr. Qin studied cereal root distribution and morphology and mineral nitrogen in soils as affected by tillage systems, crop rotation, and fertilization. Originally, Dr. Qin studied and worked at the Chinese Academy of Agricultural Sciences on sustainable agriculture and environmental conservation in the hilly red, acidic soil region of South China. These research programs included 1) aluminum toxicity in red soils and its detoxification with organic materials, 2) introducing triticale into winter-fallow paddy fields to produce forage for animal husbandry, 3) long-term application of manure and chemical fertilizer on the fertility of red soil, 4) planting grasses and legumes to control soil erosion, and 5) designing fertilizer formulas for trees in drought-affected regions.

Dr. Qin's current research focuses on soil chemistry, specifically environmental protection and fumigant management. The main objectives of the research are to minimize environmental hazards and human exposure to volatile soil fumigants and to achieve their maximum efficacy to control soil pests and diseases of high-value crops, nurseries, orchards and vineyards. Through lab incubation studies, Dr. Qin studies the fate of fumigants in soils under different environmental factors such as various fumigant application rate, soil type, temperature, soil moisture, soil microorganism, and organic matter. By carrying out lab column studies and field trials, Dr. Qin mainly studies the fumigant emissions, fumigant transport and distribution in soil profile, and residual fumigants under fumigant application methods (drip fumigation, shank fumigation, and spot-fumigation), irrigation methods, plastic film tarping, chemical seals, and manure amendments. 

Dr. Qin's research interests are: 

  • The fate and transport of pesticides and other pollutants in soil
  • Soil nutrient management and soil quality under different agronomic systems (fertilization, cropping and tillage systems, etc.)
  • Soil reclamation through agricultural management and phytoremediation
  • Nutrient and water use efficiency of crops
  • Crop production and crop health
  • Root and rhizosphere and their interaction with the environment

Educational Background:

Doctor of Natural Science, majoring in Agronomy, Swiss Federal Institute of Technology Zurich (ETHZ), Zurich, Switzerland (2003)
M.S., majoring in Soil Science, Chinese Academy of Agricultural Sciences, Beijing, China (1995)
B.S., majoring in Soil and Plant Nutrition, Shanxi Agricultural University, Shanxi, China (1992)

Last Modified: 8/31/2016
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