References
- Andrew , C.S. 1977 . The effect of sulphur on the growth, sulphur and nitrogen concentration of some tropical and temperate pasture legumes . Aust. J. Agri. Res. , 28 : 807 – 820 .
- Baethgen , W.E. and Alley , M.M. 1989 . A manual colorimetric procedure for measuring ammonium nitrogen in soil and plant Kjeldahl digests . Commun. in Soil Sci. Plant Anal., , 20 : 961 – 969 .
- Cairns , R.R. and Carson , R.B. 1961 . Effect of sulphur treatment on yield and nitrogen and sulphur content of alfalfa grown on sulphur deficient and sulphur sufficient grey wooded soils . Can. J. Plant Sci. , 41 : 709 – 715 .
- Cataldo , D.A. , Haroon , M. , Schrader , L.E. and Young , V.L. 1975 . Rapid colorimetric determination of nitrate in plant tissue by nitration of salicylic acid . Commun. Soil Sci. Plant Anal. , 6 (1) : 71 – 80 .
- Emmert , H. 1959 . Chemical analysis of tissue as a mean of determining nutrient requieriments of decidious fruit plants . Proc. Amer. Soc. Hort. Sci. , 73 : 521 – 547 .
- Fox , R.L. 1976 . Sulphur and nitrogen requirements of sugarcane . Agron. J. , 68 : 891 – 896 .
- Jones , M.B. 1986 . Sulphur availability indexes Sulphur in Agriculture , Agromnomy. N° 27 Edited by: Tabatabai , M.A. 549 – 566 . Madison , WI : Soil Science Society of America .
- Lancaster , J.E. and Boland , M.J. 1990 . “ Flavor biochemistry ” . In Onions and Allied Crops , Edited by: Rabinowitch , H.D. and Brewster , J.L. Vol. 3 , Boca Raton , FL : CRC Press .
- López‐Cantarero , I. , del‐Rio , A. , Lorente , F. and Romero , L. 1994 . Effect of N and P upon foliar . S. Phyton , 55 : 23 – 29 .
- Marschner , H. 1995 . Mineral nutrition of higher plants. , Second edition , Academic Press . ISBN: 0–12–473542–8 (HB Publishers). London.
- Mengel , K. and Kirkby , E.A. 1982 . Principles of Plant Nutrition , Bern , , Switzerland : International Potash Institute .
- Metson , A.J. 1973 . “ Sulphur in forage crops ” . In Plant analysis as a guide to the sulphur status of forage grasses and legumes , Tech. Bull. N° 20 Washington, D.C. : The sulphur Institute .
- Novozamsky , I. and Van. Eck , R. 1977 . Total S determination in plant material . Z. Anal. Chem. , 286 : 367 – 368 .
- Smith , F.W. and Dolby , G.R. 1977 . Derivation of diagnostic indexes for assessing the sulphur status of Panicum maximum var . Trichoglume. Comm. Soil Sci. Plant Anal. , 8 : 221 – 40 .
- Spencer , K. , Freney , J.R. and Jones , N.B. 1978 . “ Diagnoses of S deficiency in plant ” . In Plant nutrition , N.Z.D.S.I.R. Info. Series N° 134 Wellington Edited by: Ferguson , A.R. and col. Vol. II , 507 – 513 .
- Valenzuela , J.L. 1990 . Influencia de la fertirrigación y el agua salobre sobre el metabolismo mineral y bioquímico en plantas de melón (Cucumis melo L var. Galia) , University of Granada . Thesis.
- Valenzuela , J.L. and Romero , L. 1991 . Son útiles los análisis foliares . Ciencia Agronómica, , 0 : 80 – 105 .
- Valenzuela , J.L. , Sánchez , A. , del‐Río , A. and Romero , L. 1992 . Relationships between N supply on different P and Ca fractions in tomato and cucumber plants . Israel J. Bot. , 41 : 67 – 74 .
- Wolf , B. 1982 . A comprehensive system of leaf analysis and its use for diagnosing crop nutrients status . Comm. Soil Sci. Plant Anal. , 13 : 1035 – 1059 .