Trends in grain yields and soil organic C in a long-term fertilization experiment in the China Loess Plateau Journal of Plant Nutrition and Soil Science Volume 171 Issue 3, Pages 448 - 457 http://www3.interscience.wiley.com/journal/119877230/abstract
Long-term effects of manure and fertilization on soil organic matter and quality parameters of a calcareous soil in NW China Journal of Plant Nutrition and Soil Science Volume 170 Issue 2, Pages 234 - 243 http://www3.interscience.wiley.com/journal/114211541/abstract