1. AgWeatherNet – Tumwater, S.W., 2017. Washington State University. http://weather.wsu.edu.
2. Leaf area and above- and belowground responses of loblolly pine to nutrient and water additions;Albaugh;For. Sci.,1998
3. The Leguminosae;Allen,1981
4. Anderson, N.P., Hart, J.M., Horneck, D.A., Sullivan, D.M., Christensen, N.W., Pirelli, G.J. 2010. Evaluating soil nutrients and pH by depth in situation of limited or no tillage in western Oregon. Extension Service Oregon State University: Corvallis, OR, USA. EM9014.
5. Observations on water potential and drought resistance of trees and shrubs after a period of summer drought around Dunedin, New Zealand;Bannister;N. Z. J. Botan.,1986