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Root Elongation of Soybean Genotypes in Response to Acidity Constraints in a Subsurface Solution Compartment

^a Programa de Apoyo a la Estrategia de Desarollo Alternativo (PRAEDAC), P.O. Box 2395, Cochabamba, Bolivia
^b USDA-ARS Soil Science Dep., North Carolina State University, Raleigh, NC 27695-7619 USA
^c USDA-ARS Crop Science Dep., North Carolina State University, Raleigh, NC 27695-7620 USA

View larger version (17K): [in a new window]   Fig. 1 Mean soybean tap root length as a function of time in subsurface solution Al treatments maintained at pH values of (a) 4.2 and (b) 5.2 in Exp. 1. Symbols are observed values averaged across genotypes Ransom and PI, and lines are predicted values from polynomial regression models. Vertical bar denotes least significant difference (P < 0.05) for the pH by Al by time interaction

View larger version (33K): [in a new window]   Fig. 2 Total soybean root length and length of individual root classes at harvest in subsurface solution pH and Al treatments in Exp. 1. Root length is averaged across genotypes Ransom and PI. Vertical bar denotes the least significant difference (P < 0.05) for total root length

View larger version (25K): [in a new window]   Fig. 3 Number of lateral roots on tap roots at harvest in the subsurface compartment for soybean genotypes N93 (N), Ransom (R), PI, and Young (Y), as a function of Al concentration in solutions with 2 and 10 mM Ca in Exp. 2. Vertical bar denotes the least significant difference (P < 0.05) for the genotype x Al x Ca interaction

View larger version (27K): [in a new window]   Fig. 4 Total root length at harvest as a function of root classes and solution Al and Ca treatments in the subsurface compartment for soybean genotypes N93 (N), Ransom (R), PI, and Young (Y) in Exp. 2. Vertical bar denotes least significant difference (P < 0.05) for the genotype x Al x Ca interaction

View larger version (18K): [in a new window]   Fig. 5 Observed (symbols) and predicted (lines) relative length at harvest of (a) tap roots and (b) lateral roots of soybean genotypes N93, Ransom, PI, and Young in the subsurface solution compartment as a function of the molar activity ratios between Ca and Al3+ in Exp. 2. Prediction equations are shown in Table 8