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Root Characteristics and Phosphorus Uptake of Maize Seedlings in a Bilayered Soil

Inst. of Plant Sci., Group of Agron. and Plant Breeding, Swiss Federal Inst. of Technol. (ETH), Universitätstrasse 2, CH-8092 Zürich, Switzerland

View larger version (15K): [in a new window]   Fig. 1. Leaf area (LA) per plant as a function of topsoil bulk density (BDtop) and P concentration (Ptop) at the two- and the three-leaf stage of maize. Treatments followed by the same letter are not significantly different at = 0.05. Vertical bars are standard errors. ANOVA: *, **, and *** indicate significance at = 0.05, 0.01, and 0.001, respectively. NS, not significant.

View larger version (20K): [in a new window]   Fig. 2. (A) Phosphorus influx and (B) shoot demand per unit of root surface area from the two- to the three-leaf stage of maize as a function of topsoil bulk density (BDtop) and P concentration (Ptop). Treatments followed by the same letter are not significantly different at = 0.05. Vertical bars are standard errors. ANOVA: * and ** indicate significance at = 0.05 and 0.01, respectively.

View larger version (24K): [in a new window]   Fig. 3. Distribution of root length by diameter classes (A) in the topsoil (0–10 cm) and (B) in the subsoil (10–50 cm) as a function of topsoil bulk density (BDtop) at the three-leaf stage of maize.

View larger version (20K): [in a new window]   Fig. 4. Absolute rates of (A) leaf expansion and (B) root elongation from planting to the three-leaf stage of maize as a function of topsoil temperature (Temptop) and P concentration (Ptop). Treatments followed by the same letter are not significantly different at = 0.05. Vertical bars are standard errors. ANOVA: * and ** indicate significance at = 0.05 and 0.01, respectively. NS, not significant.

View larger version (19K): [in a new window]   Fig. 5. (A) Phosphorus influx and (B) shoot demand per unit of root surface area from the two- to the three-leaf stage of maize as a function of topsoil temperature (Temptop) and P concentration (Ptop). Vertical bars are standard errors. ANOVA: ** indicates significance at = 0.01. NS, not significant.

View larger version (22K): [in a new window]   Fig. 6. Distribution of root length by diameter classes (A) in the topsoil (0–10 cm) and (B) in the subsoil (10–50 cm) as a function of topsoil temperature (Temptop) at the three-leaf stage of maize.