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Evaluating Aeration Techniques for Decreasing Phosphorus Export from Grasslands Receiving Manure

^a Univ. of Georgia, Dep. of Crop and Soil Sciences, 3111 Miller Plant Sciences Bldg., Athens, GA 30602
^b Natural Resource Conservation Center, USDA-ARS, 1420 Experiment Station Rd., Watkinsville, GA 30677
^c Univ. of Georgia, Agricultural and Environmental Services Lab., 2400 College Station Rd., Athens, GA 30602
^d Mississippi State Chemical Lab., Mississippi State, MS 39762

View larger version (41K): [in this window] [in a new window]   Fig. 1. Mean export of total Kjeldahl P (TKP), total dissolved P (TDP), dissolved reactive P (DRP), total bioavailable P (TBAP), and dissolved bioavailable P (DBAP) as affected by aeration type with applied broiler litter at (a) PreCmpct (January 2005) and (b) PostCmpct (June 2005) rain events. Percentages indicate the proportion of TKP represented as TDP, DRP, TBAP, or DBAP. , , *, **, and *** indicate main effect of aeration type at p < 0.15, 0.1, 0.05, 0.01, and 0.001, respectively; within each phosphorus fraction, means and percentages represented by the same letter or no letters are not significantly different (p > 0.10).

View larger version (42K): [in this window] [in a new window]   Fig. 2. Mean export of total Kjeldahl P (TKP), total dissolved P (TDP), dissolved reactive P (DRP), total bioavailable P (TBAP), and dissolved bioavailable P (DBAP) as affected by aeration type with applied dairy slurry at (a) PreCmpct (January 2005) and (b) PostCmpct (June 2005) rain events. Percentages indicate the proportion of TKP represented as TDP, DRP, TBAP, or DBAP. , , *, **, and *** indicate main effect of aeration type at p < 0.15, 0.1, 0.05, 0.01, and 0.001, respectively; within each phosphorus fraction, means and percentages represented by the same letter or no letters are not significantly different (p > 0.10).

View larger version (19K): [in this window] [in a new window]   Fig. 3. Mean export of total Kjeldahl P (TKP), total dissolved P (TDP), dissolved reactive P (DRP), total bioavailable P (TBAP), and dissolved bioavailable P (DBAP) as affected by aeration type with no manure application at (a) PreCmpct (January 2005) and (b) PostCmpct (June 2005) rain events. Percentages indicate the proportion of TKP represented as TDP, DRP, TBAP, or DBAP. , , *, **, and *** indicate main effect of aeration type at p < 0.15, 0.1, 0.05, 0.01, and 0.001, respectively; within each phosphorus fraction, means and percentages represented by the same letter or no letters are not significantly different (p > 0.10).