Reference
- Lauenroth , W.K. and Whitman , W.C. 1971 . A rapid method for washing roots . J. Range Mgmt. , 24 : 308 – 309 .
- The instrument was developed and built by the author at the University of Colorado, Fort Collins, Colorado, U.S.A. during 1970–71, while participating in the U.S.A. I.B.P. Grassland Biome Studies.