Abstract:Ten wheat (Triticum aestivum) genotypes were evaluated in microplots with aluminum saturation of 0, 15, 30 and 45%, during 1994, in Londrina, Paraná, Brazil. The soil was a Distrofic Red Latosol (Typic Haplorthox), with 65% saturation of aluminum, amended with dolomitic lime. Variables evaluated included grain yield and yield components: ears.m-2, grains.ear-1 and the weight of 1000 grains. Genotypes differed in yield and yield components. Increasing aluminum saturation decreased yield, ears.m-2 and grains.ear… Show more
“…Benin et al (2004) evaluated oat genotypes and observed root growth retaking values that allowed a perfect discrimination between the sensitive and tolerant genotypes. Similar results were obtained by Freire et al (1987) in rice, by Baligar et al (1990) in sorghum and in wheat by Costa et al (2003). Cultivar Oeiras MG-6851presented a higher RL in the treatments with the presence of aluminum during the germination, regardless of aluminum absence or presence during the seedling growth.…”
“…Benin et al (2004) evaluated oat genotypes and observed root growth retaking values that allowed a perfect discrimination between the sensitive and tolerant genotypes. Similar results were obtained by Freire et al (1987) in rice, by Baligar et al (1990) in sorghum and in wheat by Costa et al (2003). Cultivar Oeiras MG-6851presented a higher RL in the treatments with the presence of aluminum during the germination, regardless of aluminum absence or presence during the seedling growth.…”
“…The crops growth in acid soil is generally poor due to saturation of Al in the soil (the degree of Al saturation is defined as the percentage of exchangeable Al relative to the total exchangeable cations) [9][10][11][12]. In a strongly acid soil (pH < 5.0), Al toxicity is considered as the greatest damaging factor for crops [13,14].…”
Humic acid plays an important role in the distribution of heavy metals in the environment. The aims of this study were conducted to evaluate the spectroscopic characteristics and aluminum (Al) adsorption of humic acids which were extracted from four composts. The functional groups were determined by Fourier transform infrared spectroscopy (FTIR) and solid-state 13 C nuclear magnetic resonance spectroscopy ( 13 C-NMR). The results showed that the aromatic groups were all found in the humic acids of the four composts, and the surface of humic acids included carboxylic group, hydroxylic group, and amino group. The experiment of Al adsorption was described by Freundlich equation. It showed that the adsorption of Al by humic acid from compost of cattle manure was higher, but that from the compost of pig manure, lemon manure, tea manure in equal preparation was lower. The adsorptive behavior was different due to the interaction by functional groups (-OH and -COOH) with Al. These results can describe the fate and transportation of Al in the soil of different organic fertilizer.
“…Al toxicity has been recognized, for a long time, as the main limiting factor of the plant growth in the acidic soils (Hartwell and Pember, 1918;Magistad, 1925). Al reduces the plant development as a whole (Randall and Vose, 1963;Costa et al, 2003) and interferes with the root elongation (Matsumoto and Morimura, 1980), nutrients' uptake, transport and use (e.g. phosphorus -P) (McCormick and Borden, 1972;Adrew and Berg, 1973;McCormick, 1974;Fleming, 1983).…”
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