Abstract
The influence of a surface application of 4.5 and 9 magnesium (Mg) ha‐1 (fresh weight) poultry litter and 112 kg ha‐1 diammonium phosphate (DAP) on soil chemical characteristics, foliar nutrient concentrations, and stem diameter growth in an 18‐year‐old loblolly pine (Pinus taeda L.) stand was examined. Nitrogen (N) and phosphorus (P) were applied at a rate of 119 and 53 kg ha‐1, respectively, in the 4.5 Mg ha‐1 poultry litter treatment and 24 and 27 kg ha‐1, respectively, in the DAP treatment. No treatment effects on soil N or NO3‐N concentrations 6 and 18 months after treatment were observed, but greater N concentration in current‐year‐needles was observed four months after treatment in response to 9 Mg ha‐1 poultry litter. Six and 18 months after treatment, 9 Mg ha‐1 poultry litter increased P concentration in the 0–15 cm layer of soil relative to the control. Poultry litter and DAP treatments increased foliar P concentration, but the largest increase in foliar P concentration was observed in response to 9 Mg ha‐1 poultry litter. Stem diameter growth was increased 38 and 25% by 9 Mg ha‐1 poultry litter and DAP, respectively. Based on diameter and foliar nutrient responses, the highest poultry litter rate was an effective fertilizer.
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