Abstract
A field experiment was conducted on a Commerce silt loam (alluvial) soil near Baton Rouge, Louisiana, to study the effects of subsurface drainage on soil trafficability for two different water management systems: surface drainage only and subsurface drainage. Following a 30–mm rainfall event there was a significant difference in the decrease of soil moisture at a 10–cm depth directly above the subsurface drains compared with midway between drain pipes spaced at 15 m. Differences in soil moisture content between subsurface drained and surface drained only plots were not statistically significant, however, the plots that were subsurface drained had trafficable conditions one day sooner than the surface drained only plots. Soil strength values above the subsurface drains were consistently higher than at the mid–point between drains and soil strength increased as water table depth increased. A portable capacitance volumetric soil moisture meter was evaluated in this project for the accuracy in obtaining soil moisture content in the field. Results have shown that there was no correlation between the soil moisture obtained in situ by the volumetric moisture meter and by analysis of soil samples.
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