Page 232 - Nutrient Management Planning Guide

From the earlier case study, the liquid manure source contained 3,200,000 L, while the solid manure source contained 984 t. The total area available for annual liquid manure application is 130 ha and the total area available to receive solid manure on an annual basis is 106 ha. The threshold annual application rates for these two manure sources and land bases are:

Threshold application rate for liquid manure (L/ha) = 3,200,000 ÷ 130 ha = 24,600L/ha/yr Threshold application rate for solid manure (t/ha) = 984 t÷ 106 ha = 9.28 t/ha/yr

Compare these threshold application rates to the application rates calculated in the case study:

The total area of 130 ha, for the annual liquid manure application, has a threshold application rate of 24,600 L/ha/year. Therefore, there is sufﬁcient land base avaialble for the one-year and two-year N based application rates scenarios. Unfortunately, there is insufﬁcient land base available for the liquid manure applied on a three-year P based application scenario. An additional 46 ha would be required to accommodate all the manure produced (3,200,000 L/year) if it was applied at the equivalent of 18,181 L/ha/year or 54,545 L/ha once every three years.

The total area of 106 ha, for the annual solid manure application, has a threshold application rate of

13.1 to/ha/year. Therefore, there is sufﬁcient land base available for the one-year and two-year N based application rates scenarios. Unfortunately, there is insufﬁcient land base available for the solid manure applied on a three-year P based application scenario. An additional 19 ha would be required to accommodate all the manure produced (984 t/year) if it was applied at the equivalent of 7.9 t/ha/yr or 23.7 t/ha once every three years.