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Calculating Manure Application Rates and Fertilizer Requirements

Scenario 1: N-based; Single-Year Application Rate

Liquid manure:

The target application rate to supply one year’s worth of available N is: Application rate (metric units) = 78 kg/ha ÷ 2.4 kg/1,000 L * × 1,000

Application rate (metric units) = 32,500 L/ha

To convert this to imperial units:

Application rate (imperial units) = 32,500 L/ha × 0.089 (Table 4.3.3)

Application rate (imperial units) = 2,893 gal/ac

* Nutrient concentrations in g/L are the same as kg/1,000 L

Solid manure:

The target application rate to supply a single year’s worth of available N is: Application rate (metric units) = 78 kg/ha ÷ 3.3 kg/ t

Application rate (metric units) = 23.6 t/ha

To convert this to imperial units:

Application rate (imperial units) = 23.6 t/ha × 0.4461 (Table 4.3.3)

Application rate (imperial units) = 10.5 tn/ac