References
- Beyers , E. 1962 . S. Afr. J. Agric. Sci. , 5 : 315 – 329 .
- Booss , A. , Hofner , W. and Scalier , K. 1984 . J. Plant Nutrition , 7 : 1605 – 1622 .
- Caine , J. C. 1953 . Proc. Amer. Soc. Hort. Sci. , 62 ( 6 ) : 53 – 66 .
- Harper , A. M. , Duewer , D. L. , Kowalski , B. R. and Fasching , J. L. 1977 . ACS Symposium No. 52 , Edited by: Kowalski , B. R. Washington, D.C. : American Chemical Society .
- Johnson , R. A. and Wichern , D. W. 1962 . Applied multivariate statistical analysis , Englewood Cliffs, N.J. : Prentice Hall, Inc. .
- Sharpies , R. O. 1980 . Mineral nutrition of fruit trees , Edited by: Atkinson , D. , Jackson , J. E. , Sharpies , R. O. and Waller , W. M. 17 – 28 . London : Butterworths .
- Shear , C. B. 1980 . Mineral nutrition of fruit trees , Edited by: Atkinson , D. , Jackson , J. E. , Sharpies , R. 0. and WaTTer , W. M. London : Butterworths .
- Terblanche , J. H. , Gurgen , K. H. and Hesebeck , I. 1980 . Mineral nutrition of fruit trees , Edited by: Atkinson , D. , Jackson , J. E. , Sharpies , R. 0. and Waller , W. M. London : Butterworths .
- Terblanche , J. H. , Gurgen , K. H. and Pienaar , W. J. 1979 . Decid. Fruit Grow , 29 : 10 – 16 .
- Webb , R. A. 1972 . J. Hort. Sci. , 47 : 309 – 319 .