References
- Ali , A. G. , Lo , V. and Att , C. J. 1994 . Winter application of low-biuret urea to the foliage of ‘Washington’ navel orange increased yield . J. Amer. Soc. Hort. Sci. , 119 : 1144 – 1150 .
- Anon . 1972 . Technicon Auto Analyser. Vol. Vol. 2 , Industrial method, No. 98–70W
- Coetzee , J. G.K. 1990 . “ Citrus fertilisation ” . In Production Guidelines for Export Citrus. Vol. II, S.A. Coop Citrus Exchange, Hennopsmeer, South Africa. Edited by: Netterville , R. M.
- Davies , F. S. and Albrigo , L. G. 1994 . Citrus. Crop Production Science in Horticulture 2, 1st ed., Wallingford, UK. CAB International, Great Britain.
- Gilfillan , I. M. 1992 . “ Crop manipulation: Improvement of fruit colour ” . In Production Guidelines for Export Citrus. Vol. II, S.A. Co-op Citrus Exchange, Hennopsmeer, South Africa. Edited by: Netterville , R. M.
- Tones , W. W. and Embleton , T. W. 1959 . The visual effect of nitrogen nutrition on fruit quality of ‘Valencia’ oranges . Proc. Amer. Soc. Hort. Sci. , 73 : 234 – 236 .
- Kato , T. 1986 . Nitrogen metabolism and utilisation in Citrus . Hort. Rev. , 8 : 181 – 216 .
- Lovatt , C. J. 1998 . Managing yield with foliar fertilization . Citrograph , 98 : 8 – 13 .
- Rabe , E. 1993 . Yield improvement in ‘Shamouti’ orange trees in a subtropical climate . S. Afr. Citrus J. , 3 : 953 – 1018 .
- Rabe , E. 1994 . Yield benefits associated with pre-blossom low-biuret urea sprays on Citrus spp . J. Hort. Sci. , 69 : 495 – 500 .
- Rabe , E. and Van Der Walt , H. P. 1992 . Effect of urea sprays, girdling and paclobutrazol on yield in ‘Shamouti’ sweet orange trees in a subtropical climate. J . S. Afr. Soc. Hort. Sci. , 2 : 77 – 81 .
- Reitz , H. J. and Koo , R. C.J. 1960 . Effect of nitrogen and potassium fertilization on yield, fruit quality and leaf analysis of ‘Valencia’ orange . Proc. Amer. Soc. Hort. Sci. , 75 : 244 – 252 .
- Reuther , W. and Smith , P. F. 1952 . Relation of nitrogen, potassium and magnesium fertilization to some fruit qualities of ‘Valencia’ orange . Proc. Amer. Soc. Hort. Sci. , 59 : 1 – 12 .
- Sas Institute Inc . 1996 . User's guide, Version 6, , 4th ed. Vol. 1 , Cary , N.C.
- Smith , P. F. , Scudder , J. R.G.K. and Hrnciar , G. 1969 . Nitrogen rates and time of application on yield and quality of ‘Pineapple’ orange and ‘Marsh’ grapefruit . Proc. Fla. State Hort. Soc. , 82 : 20 – 25 .