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Effect of Liquid Swine Manure Rate, Incorporation, and Timing of Rainfall on Phosphorus Loss with Surface Runoff

Dep. of Agronomy, Iowa State Univ., Ames, IA 50010. B.L. Allen was formerly a graduate research assistant and postdoctoral research associate and is currently at USDA-ARS, Northern Plains Agricultural Research Lab, Sidney, MT 59270

View larger version (23K): [in this window] [in a new window]   Fig. 1. Effect of manure application rate, incorporation, and time of simulated rainfall on runoff P concentrations for the Boone site in 2002. INC, manure incorporated; NOINC, manure not incorporated. NS indicates no interaction (P < 0.05) between P rate and incorporation.

View larger version (24K): [in this window] [in a new window]   Fig. 2. Effect of manure application rate, incorporation, and time of simulated rainfall on runoff P concentrations for the Marshalltown site in 2002. INC, manure incorporated; NOINC, manure not incorporated. NS indicates no interaction (P < 0.05) between P rate and incorporation.

View larger version (18K): [in this window] [in a new window]   Fig. 3. Effect of manure application rate, incorporation, and time of simulated rainfall on runoff P concentrations for the Boone site in 2003. INC, manure incorporated; NOINC, manure not incorporated. NS indicates no interaction (P < 0.05) between P rate and incorporation.

View larger version (19K): [in this window] [in a new window]   Fig. 4. Effect of manure application rate, incorporation, and time of simulated rainfall on runoff P concentrations for the Marshalltown site in 2003. INC, manure incorporated; NOINC, manure not incorporated. NS indicates no interaction (P < 0.05) between P rate and incorporation.

View larger version (23K): [in this window] [in a new window]   Fig. 5. Effect of manure application rate, incorporation, and time of simulated rainfall on runoff P loads for the Boone site in 2002. INC, manure incorporated; NOINC, manure not incorporated. NS indicates no interaction (P < 0.05) between P rate and incorporation.

View larger version (37K): [in this window] [in a new window]   Fig. 6. Effect of manure application rate, incorporation, and time of simulated rainfall on runoff P concentrations for the Marshalltown site in 2002. INC, manure incorporated; NOINC, manure not incorporated. NS indicates no interaction (P < 0.05) between P rate and incorporation.

View larger version (19K): [in this window] [in a new window]   Fig. 7. Effect of manure application rate, incorporation, and time of simulated rainfall on runoff P loads at the Boone site in 2003. INC, manure incorporated; NOINC, manure not incorporated. NS indicates no interaction (P < 0.05) between P rate and incorporation.

View larger version (19K): [in this window] [in a new window]   Fig. 8. Effect of manure application rate, incorporation, and time of simulated rainfall on runoff P loads for the Marshalltown site in 2003. INC, manure incorporated; NOINC, manure not incorporated. NS indicates no interaction (P < 0.05) between P rate and incorporation.