Effect of ISPAD Anaerobic Digestion on Ammonia Volatilization from Soil Applied Swine Manure

Table 4

Manure N fertilizer value for similar P and K applications for the two experimental manures, untreated (open tank) and anaerobically digested (ISPAD).

	Open tank manure	ISPAD manure
Case  1: Ideal, 𝑁available (gL^−1)	1.78	1.88
Case  2: Average, 𝑁available (gL^−1)	1.25	1.48
Case  3: Uncontrolled, 𝑁available (gL^−1)	0.80	0.97

Case  1 refers to immediate soil incorporation for a spring application, Case  1 refers to soil incorporation after 48 hours for a summer application, and Case  3 refers to leaving the manure at the soil surface for a fall application.