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Phosphorus Extraction by Cotton Fertilized with Broiler Litter

^a AWMRU, USDA-ARS, 810 Hwy. 12 East, Mississippi State, MS 39762
^b AWMRU, USDA-ARS, 230 Bennett Ln., Bowling Green, KY 42104
^c WMFRU, USDA-ARS, 810 Hwy. 12 East, Mississippi State, MS 39762

View larger version (14K): [in this window] [in a new window]   Fig. 1. Relationship between applied total plant available N and bulk leaf P concentration on selected dates in cotton grown with broiler litter with or without supplemental N as urea ammonium nitrate solution at Cruger (conventional-till) and Coffeeville (no-till) in Mississippi. Each data point is an average of three or four replications.

View larger version (18K): [in this window] [in a new window]   Fig. 2. Amount of extracted phosphorus in plant parts of cotton grown with broiler litter with or without supplemental N as urea ammonium nitrate solution at Cruger (conventional-till) and Coffeeville (no-till) in Mississippi. Each data point is an average of three or four replications, 10 treatments, two locations, and 3 yr (2002–2004).

View larger version (74K): [in this window] [in a new window]   Fig. 3. Total P extracted by cotton grown with broiler litter with or without supplemental N as urea ammonium nitrate solution (UAN-N) at Cruger (conventional-till) and Coffeeville (no-till) in Mississippi in 2002 to 2004. Each bar segment is an average of three or four replications. Applied UAN-N rates in 2004 under the conventional-till were 67 and 135 kg ha–1 instead of the 34 and 67 kg ha–1 applied in 2002 and 2003. STD = farm standard fertilization.

View larger version (18K): [in this window] [in a new window]   Fig. 4. Relationship of P partitioning to plant parts with applied total plant available nitrogen (NTPA) of cotton grown with broiler litter with or without supplemental N as urea ammonium nitrate solution at Cruger (conventional-till) and Coffeeville (no-till) in Mississippi in 2003.