References
- Buys , A. J. and Eisenberg , B. E. Inter‐Laboratory Soil Analysis Quality Control Scheme for South Africa . Paper presented at the Congress of the Soil Science Society of South Africa . July 1987 , Nelspruit .
- Buys , A. J. , Van Vuuren , J. A. J. , Coetzee , J. U. K. , Claassens , A.S. and Barnard , R. O. ALASA ‐ Agricultural Laboratory Association of Southern Africa ‐ ensuring reliable analyses . Poster presentation, International Symposium on Soil and Plant Analysis . Wageningen , The Netherlands. (This issue)
- Houba , V.J.G. Bi‐monthly and annual reports to participants: Plant Sample Exchange Programme , The Netherlands : Wageningen Agricultural University .
- Non‐Affiliated Soil Analysis Work Committee . 1990 . Handbook of Standard Soil Testing Methods for Advisory Purposes , Pretoria , , South Africa : Soil Science Society of South Africa .
- Kynoch Fertilizers, South Africa.