Wednesday, November 15, 2006
297-7

Effectiveness of Poultry Litter as a Fertilizer for Newly Established Loblolly Pine (Pinus taeda L.).

Allan Pringle, Division of Environmental Science, Box 13073 SFA Station, Nacogdoches, TX 75962 and Kenneth Farrish, College of Forestry and Agriculture, Stephen F. Austin State Univ, Box 6109 SFA Station, Nacogdoches, TX 75962.

The poultry industry in east Texas produces large amounts of poultry litter, a mixture of poultry manure and bedding materials such as pine shavings. Typically the litter is applied to pastures near the poultry houses to provide N to forage crops. However, excess P loading of these pastures results from many repeated applications. Forest industry in the region uses chemical fertilizers to enhance the growth of loblolly pine plantations. If poultry litter were found to be a suitable replacement for the chemical fertilizers used in the forest fertilization, the land area available for its use would greatly increase and excessive P loading of pastureland, a significant environmental concern, could be reduced. The objective of this sand culture pot study (1 gal pots) was to compare the effectiveness of poultry litter to the operationally used diammonium phosphate (DAP) for newly established loblolly pine (Pinus taeda L.) plantations. DAP was applied at the operational rate of 250 lbs per acre adjusted to pot size. Two different poultry litter rates were applied. The first supplied all of the P of the DAP treatment with excess N, while the second poultry litter rate supplied all of the N and the balance of the P applied as triple super phosphate (TSP). A control received no fertilizer. Each treatment was replicated 10 times. Seedlings were grown for twelve weeks in a growth chamber set to simulate summer conditions in east Texas. Seedlings were watered when needed and drainage water was collected and analyzed for macronutrients leaving the pots. Height and diameter growth, shoot/root ratios, and total biomass were determined. Macronutrient content of seedling tissues were also determined. Results are presented.



Handout (.ppt format, 1680.0 kb)