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Distribution of Phosphorus Forms in Soil Following Long-term Continuous and Discontinuous Cattle Manure Applications

Lethbridge, AB T1J 4B1 Canada, Agriculture and Agri-Food Canada, Lethbridge Research Center, 5403 1st Ave S., Lethbridge, AB, T1J 4B1 Canada

View larger version (22K): [in this window] [in a new window]   Fig. 1. Increases in various soil P forms in manured soil relative to the non-manured control treatment after 30-yr annual cattle manure application under rain-fed and irrigated conditions.

View larger version (21K): [in this window] [in a new window]   Fig. 2. Soil test P (STP) to TP ratio in response to manure TP applied over (a) 30 yr and (b) 14 yr with 16 yr no further application (STP = H2O-P + NaHCO3–Pt).

View larger version (20K): [in this window] [in a new window]   Fig. 3. Increases in various soil P forms in manured soil relative to the non-manured control treatment after 14 yr annual cattle manure application and 16 yr with no further application under rain-fed and irrigated conditions.