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Spatial Distribution of Roots and Water Uptake of Maize (Zea mays L.) as Affected by Soil Structure

^a Dipartimento di Produzione Vegetale, Univ. della Basilicata, Via N. Sauro 85, 85100 Potenza, Italy
^b Dep. Crops and Soil Science, Michigan State Univ., East Lansing, MI 48824

View larger version (33K): [in a new window]   Fig. 1. Initial and final water content (v) in the containers and water extracted from planting to termination of the experiment for treatments C (clay-loam soil), S (sandy-clay soil), CC (compacted clay-loam), S + LA (Sandy-clay soil + large peds), S + SA (S soil + small peds). Vertical bars represent twice the standard deviation. Where vertical bars are not present, the standard deviation is <0.005 cm3 cm-3.

View larger version (19K): [in a new window]   Fig. 2. Green leaf area per plant. Vertical bars represent twice the standard deviation. Where vertical bars are not present, they are smaller than symbols.

View larger version (28K): [in a new window]   Fig. 3. Root length density (RLD) in peds and fine soil of Treatment S + SA (Sandy-clay soil + small peds) and S + LA (sandy-clay soil + large peds) at different soil depths at the end of the experiment. Vertical bars represent the standard deviation.

View larger version (23K): [in a new window]   Fig. 4. Small scale measurement of volumetric water content (v) determined by TDR and root length density for four soil structural treatments. S = across a 10-cm soil transects in the 25- to 50-cm layer of Treatment S (sandy-clay soil). S + LA = in the bulk soil and across peds in the 33- to 66-cm layer of Treatment S + LA (sandy-clay soil + large peds). C = across peds in the 25- to 50-cm layer of treatment C (clay-loam soil). S + SA = in the bulk soil and across peds in the 25- to 50-cm layer of Treatment S + SA (sandy-clay soil + small peds). Vertical bars represent twice the standard deviation.