Depth to subsurface compaction la yer is 300 psi soil penetrometer readingAverage of 10 samples per plot, 8 replicates per treatmentWithin row samples in spring were where winter-killed tillage radish was growing,between row samples in spring were taken randomly, throughout plotsPlastic mulch treatments a re a 4 inch raised bed and will impactin-sea son depth to compaction layer.