01648naa a2200205 a 450000100080000000500110000800800410001902400510006010000190011124500730013026000090020352010740021265000100128665000260129665000100132265000170133265000120134970000180136177300630137911972692025-06-18       1987    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1080/019041687093635982DOI1 aFAGERIA, N. K.  aTolerance of rice cultivars to iron toxicity.h[electronic resource]  c1987  aIron toxicity i s an important growth-limiting factor for flooded rice production in various parts of the world, including Brazil. Data related to the reaction of rice cultivars to iron concentrations are limited, especially for large numbers of cultivars. Forty rice cultivars were grown in a greenhouse in nutrient solutions containing 0.09, 0.89, and 1.78 mM Fe (5, 50 and 100 ppm Fe). The e f f e c t s of excess iron were measured on plant height, root length, and root and shoot dry weight. Root and shoot dry weight were found to be more sensitive to excess iron concentration. Based on dry matter yield, reduction of shoots at higher Fe concentrations compared to the optimum or control treatment, rice cultivars were classified as tolerant, moderately tolerant, moderately susceptible or susceptible. The effect of Fe concentrations on concentrations and contents of other nutrient was also investigated. Higher concentration of Fe in the nutrient solution exerted an inhibiting effect on the concentrations and contents of almost all macro and micronutrients.  aArroz  aComposição química  aFerro  aOryza sativa  aToxidez1 aRABELO, N. A.  tJournal of Plant Nutritiongv. 10, n. 6, p. 653-661, 1987.