To investigate the effect of planting density on nutrient uptake,
9 small scale replicate subsurface flow CWs were installed in a
single span poly tunnel,5m×20m(W×L) on an intensive marine
fish farmin Pwllheli,North Wales,UK.Each CW had a 4 m2 surface
area and 1.2 m3 volume (1m×4m×0.3 m, W×L×H). The
CWs were scaled down replicas of those described in detail by
Webb etal.(2012) and were laid out in a randomised block
design, with the poly tunnel divided into 3 section sand each
CW type(high-/low-density planting and unplanted control)was
represented in each of these. In those beds designated
for high-density planting,the mixed M grade quarry sand layer
was reduced to 60 mm depth.In addition,the original irrigation
and drainage system was modified enabling these parate supply of wastewater to and discharge from each group of 3 CW
To investigate the effect of planting density on nutrient uptake,
9 small scale replicate subsurface flow CWs were installed in a
single span poly tunnel,5m×20m(W×L) on an intensive marine
fish farmin Pwllheli,North Wales,UK.Each CW had a 4 m2 surface
area and 1.2 m3 volume (1m×4m×0.3 m, W×L×H). The
CWs were scaled down replicas of those described in detail by
Webb etal.(2012) and were laid out in a randomised block
design, with the poly tunnel divided into 3 section sand each
CW type(high-/low-density planting and unplanted control)was
represented in each of these. In those beds designated
for high-density planting,the mixed M grade quarry sand layer
was reduced to 60 mm depth.In addition,the original irrigation
and drainage system was modified enabling these parate supply of wastewater to and discharge from each group of 3 CW
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