Research Article

Runoff and Nutrient Losses from Constructed Soils Amended with Compost

Table 5

Comparison of runoff concentration of total dissolved P (TDP) among contrasting roadside treatments for selected rain events on an 8.5% slope. Rain amounts for the respective events were 23, 5, 18, 29, and 50 mm. See Table 2 caption for description of treatments and compost sources.

TreatmentCompostRain event
Rate1 (5 Jun)3 (14 Jun)6 (4 Jul)8 (11 Aug)10 (31 Aug)
(m3 m−3)(mg L−1)(mg L−1)(mg L−1) (mg L−1) (mg L−1)

ControlNANA1.9d2.2d1.8c3.2b2.6c
CMTCDM0.1252.7d3.2cd2.4c3.4b2.6c
CMTCMB0.1252.6d2.8d2.1c3.8b3.3c
CMTCDM0.255.2c6.0c2.8c3.9b3.3c
CMTCMB0.253.2cd3.4cd2.7c4.2b3.2c
ECCCDM0.5017.1a17.3a11.4a11.0a11.2a
ECCCMB0.509.6b13.0b8.0b11.4a8.3b

Different letters in columns represent significant differences using Fisher’s LSD means separation test.