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a USDAARS, Waste Management and Forage Res. Unit, Mississippi State, MS 39762
b USDAARS, U.S. Dairy Forage Res. Center, Madison, WI 53706
c Dep. of Plant and Soil Sci., Mississippi State Univ., Mississippi State, MS 39762
d USDAARS, Animal Waste Management Res. Unit, 230 Bennett Lane, Bowling Green, KY 42104
* Corresponding author (jjread{at}msa-msstate.ars.usda.gov)
Received for publication July 27, 2005. Land application of poultry litter provides essential nutrients for hybrid bermudagrass [Cynodon dactylon (L.) Pers.] production, but ammonia (NH3) volatilization and N mineralization influence the amount of litter N available for plant uptake. Our objective was to determine the combination of broiler litter and fertilizer N, which maximizes the yields of forage and N, P, and K by Coastal bermudagrass. Studies were conducted for 3 yr (19992001) in pastures at Newton and Mize, MS that differed widely in soil test P (STP) due to history of litter application (0 vs. 30+ yr, respectively.). Litter rates of 0, 4.5, 8.9, 13.4, and 17.9 Mg ha1 were obtained by up to four monthly (AprilJuly) applications of 4.5 Mg ha1 and were supplemented with ammonium nitrate (NH4NO3) to provide the same total N in each treatment. At Newton, combining litter with fertilizer N increased forage yield by 10% in 1999, 25% in 2000, and 34% in 2001, as compared to fertilizer N. At Mize, K uptake increased as litter rate increased in 2001 only. These responses to litter were related to increased soil P and K at Newton, and increased soil N, P, and Ca at Mize. Averaged across years, maximum P uptake of about 40 kg ha1 was obtained by applying 8.9 Mg litter + 134 kg N ha1 at Newton and 4.5 Mg litter + 202 kg N ha1 at Mize. Safe and effective management of major plant nutrients in broiler litter may require the use of commercial N fertilizer.
Abbreviations: DM, dry matter ICP, inductively coupled plasma spectrophotometer STP, soil test phosphorus
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