References
- Ajler , R. , Cop , M. and Stupar , J. 1988 . Interferences in the determination of chromium in plant materials and soil samples by flame absorption spectro‐metry . Analyst , 113 : 585 – 590 .
- Bartlett , R.J. and Kimble , J.M. 1976 . Behaviour of chromium in soils: I. Trivalent forms . J. Environ. Qual. , 5 : 379 – 383 .
- Baxter , J.C. , Aguilar , M. and Brown , K. 1983 . Heavy metals and persistent organics at a sewage sludge disposal site . J. Environ. Qual. , 12 : 311 – 316 .
- Kitson , R.E. and Mellon , M.G. 1944 . Colorimetric determination of P as molybdovanado phosphoric acid . Ind. Eng. Chem. Anal. Ed. , 16 : 379 – 383 .
- Martinez , V. , Cerda , A. and Fernandez , F.G. 1987 . Salt tolerance of four tomato hybrids . Plant and Soil , 97 (2) : 233 – 241 .
- Mataix , J. , Gomez , I. and Pedreno , J. Navarro . 1992 . Incidencia de NO3‐Na2SO4 sobre la actividad de la nitrato reductasa y clorofilas en plantas de tomate . Agrochimica , 35 (4) : 327 – 334 .
- Sarro , M.J. , Cadahia , C. and Penalosa , J.M. 1986 . Control de un cultivo hidroponico de tomate mediante correcciones periodicas de los nutrientes. Aplicaciones a invernaderos comerciales . Anal. Edafol. Agrobiol. , 45 (5–6) : 729 – 738 .
- Smith , C.B. and Demchak , H.T. 1987 . Nutrient‐element interactions in vegetable crops . J. Plant Nutr. , 10 (9–16) : 1501 – 1507 .
- Wang , W. 1987 . Root elongation method for toxicity testing of organ and inorganic pollutants . Environ. Toxicol. Chem. , 6 : 409 – 414 .
- Yamaguchi , T. and Aso , S. 1977 . Chromium from standpoint of plant nutrition: I. Effect of chromium concentration on the germination and growth of several kinds of plants . J. Sci. Soil Manure Jpn. , 48 : 466 – 470 .
- Department Quimica Agricola, Geologia y Geoguimica, Universidad Autonoma de Madrid, Spain.