000A88A4.123.tif · 132003.221037

Phosphorous (P)

Total Phosphorous (P) added in irrigation is 7.7 kg/na/year and the total P removed by the

- potential clearing/mowing of grassed areas is 10.7 kg/ha/year. Over the 50-year running period

the model predicts the total P stored in the soil decreases from 667.9 kg/ha to 505.2 kg/ha. This
indicates a total P deficit of 162.7 kg/ha for the 50-year period. As for nitrogen, soil conditions
within the effluent irrigation areas would be monitored under an effluent irrigation management
plan.

Piant Stress
Table 5.3.3 below details the average plant stress levels experienced by existing
grass/vegetation throughout the year for a number of envirenmental parameters. A value of 0

indicates no stress while a value of 1 indicated full stress.

Tabie 5.3.3 Plant Stress Levels Throughout the Year

Janua 0.6
Febru 0.6
March 0.6
April 0.6
Ma 0.6

June 0.6
Ju 0.4
August 0.3
Se ber 0.3
October 0.4
November 0.4
December 0.5

O1pol/osololgio|a

 

It can be seen that plant stress levels experienced are for temperature during the colder months
from May to August. This stress can be minimised by selecting and planting cold temperature
resistance grass that would result in lower stress levels.

Plant stress levels are also high for nitrogen deficit from January to June. The application of
nitrogen fertilizers as required, can overcome the plant stress levels during this period.

Drainage

MEDLI was run initially without any effluent irrigation to determine the volume of drainage from
the site under current site conditions. This volume was determined to be 384 mm/year. The
volume of drainage from the site for the chosen scenarios is 745.4 mm/year. This is 361
mm/year greater than the “without effluent irrigation” scenario. The MEDLI results indicate that
the average nitrogen concentration of this recharge volume is 0.2 mg/L for the chosen scenario.

Runotf

MEDLI was run initially without any effluent irrigation to determine the volume of rainfall runoff
from the site under current site conditions. This volume was determined to be 223 mm/year. The
volume of runoff from the site for the chosen scenario is 315.6 mm/year. This is 92.6 mm/year
greater than the “without effluent irrigation” scenario.

 

PETRAC LAND HOLDINGS P/L Noosa North Shore Eco-Tourism Portal September 2003
LA7296-03\Repor\FINAL REPORT - 18Sepi03.doc Commercial in Confidence Page 15