1. R Physiological diagnosis—a guide for improving maize production based on principles developed for rubber trees;Beaufils;Fertil. Soc. South Africa J.,1971
2. Diagnosis and Recommendation Integrated System (DRIS). A general scheme for experimentation and calibration based on principles developed from research in plant nutrition;Beaufils;Soil Sci. Bul. Univ. 1, Natal, Pietermaritzburg South Africa,1973
3. Effect of time of sampling on the diagnosis of the N, P, k, Ca, and Mg requirements of sugar cane by the DRIS approach;Beaufils;Proc. South Africa Sug. Technol. Assoc.,1977
4. Height and diameter growth response in loblolly pine stands following fertilization;Bolstad;For. Sci.,1987
5. Factors contributing to variability in loblolly pine foliar nutrient concentrations South;Colbert;J. Appl. For.,1996