The soybean genotypes BR86-5974, BR86-7396, Dourados, Doko RC, EMGOPA 305, IAC-9, BR-9 (Savana), UFV-1, UFV-9 e UFV Araguaia were evaluated for Al tolerance in simple-short term nutrient solution and in soil. Root elongation was measured in the nutrient solution, and the following agronomic characters were measured for the soil evaluation of tolerance: leaf area, plant height, first pod height, dry matter, grain yield and harvest index. The soil was partly amended with lime to leave 49% Al saturation. The most tolerant genotypes in both experiments were BR86-7396 and IAC-9; UFV-1 was shown to be the most intolerant. A positive correlation coefficient of root elongation and field parameters of grain (r = 0.705), dry matter yield (r = 0.634) and leaf area (r = 0.645) indicate that short term hydroponics and field experiments are equally effective in screening Al-tolerant soybean genotypes. The detected genetic variability among the genotypes demonstrate that it can efficiently be used in breeding programmes to improve yield stability in the Brazilian Savannahs (Cerrado).
Glycine max; nutrient uptake; metallic elements; genetic variation
