02134naa a2200313 a 450000100080000000500110000800800410001902200140006002400280007410000190010224501210012126000090024252012370025165000130148865000250150165000090152665000100153565000120154565000140155765000170157165000240158865300230161265300220163565300350165765300240169265300160171670000230173277300650175512081372020-06-18 1982 bl uuuu u00u1 u #d a0032-079X7 a10.1007/BF021857012DOI1 aFAGERIA, N. K. aInfluence of aluminum in nutrient solutions on chemical composition in upland rice cultivars.h[electronic resource] c1982 aAluminum toxicity is an important growth limiting factor for upland rice production on oxisols of ?cerrado? region in Brazil. Data related to the effect of Al on uptake of nutrients for rice crop are limited. The effect of five Al concentrations (0, 10, 20, 40 and 60 ppm) in culture solution on the chemical composition of 30 upland rice cultivars was studied. Aluminum concentration and content in plant tissues were increased with higher levels of Al in all cultivar. In the roots Al content was higher as compared with the tops. Critical toxic level of Al in the tops of 21 days old plants varied from 100 to 417 ppm depending on the cultivars. Rice cultivars responded differently to Al treatments with respect to nutrients uptake. Increased Al concentrations in the solution exerted an inhibiting effect on the concentrations and contents of N, P, K, Ca, Mg, S, Na, Zn, Fe, Mn, B and Cu. Thus the inhibition was more effective for macronutrients in the plant tops in following order: Mg>Ca>P>K>N>S>Na. Whereas for micronutrients it was in the order of Mn>Zn>Fe>Cu>B. Morphological, physiological and biochemical effects of Al, toxicity responsible for the reduction in plant nutrient uptake, are discussed. aaluminum aChemical composition arice aArroz aCerrado aNutriente aOryza Sativa aSolução Nutritiva aAluminum toxicitiy aArroz de sequeiro aComposição química de arroz aToxidez de aluminio aUpland rice1 aCARVALHO, J. R. P. tPlant and Soil, The Haguegv. 69, n. 1, p. 31-44, Feb. 1982.