POULTRY LITTER NOTEBOOK
- Studies of the surface and
subsurface fate and transport
- of nitrogen and phosphorous
from poultry litter
- © 2000, 2001, D. Baker & D. Scott
Poultry litter is often used and disposed, wittingly
or not, as fertilizer. In the Mid-South and elsewhere, animal
waste is becoming a detrimental addition to surface and ground
waters. These web pages, papers and tutorials represent a continuing
effort to understand and model the transformation and movement
of organic and inorganic fertile materials in poultry litter from
the surface of agricultural fields down to the ground water.
This is a work in progress, albeit slowly.
These pages should be considered drafts and preprints of current
and past work. Hopefully, as the work progresses, and time and
money permit, more will be added to this site, and existing material
updated and improved. The dates on the topic links below indicate
when the material was last updated. Some of the html files are
lengthy and take longer than usual to download due to the large
numbers of tutorial graphs and equations. Patience is its own
- 11/21/2000 - Calibration to
field data. A draft Word 97 document (not html) describing
the calibration the flow code to 1990 and 1991 field data, using
a unique minimal-parameterization approach, Fletcher-Reeves optimization
and an objective function based on the probability that model
estimates fit the mean values of replicate field sensor readings.
- 9/19/2000 - Soil data fitting.
A draft description of how soil hydraulic saturation and conductivity
data were fitted from field and laboratory data for a field of
tall fescue in northwest Arkansas, with a downloadable DOS program
for fitting saturation relation data with simulated annealing.
- 9/19/2000 - POULIT flow code.
A draft description of the subsurface water flow modeling code
in POULIT, with downloadable example files. Flow code only, no
temperature or transport compenents. A good tutorial on the application
of a second-order Runge-Kutta time stepping method to rapid infiltration
- 9/19/2000 - POULIT I/O specification.
A draft description of the program variables, and input and output
- 9/13/1998 - Modeling the mineralization
and volitilization of nitrogen in poultry litter applied to tall
fescue. A draft paper by H.D. Scott, D.L. Baker, M.J. Cochran
and J. Smartt. Primarily a description of the separation of surface
litter decomposition mechanisms into separate numerical compartments.
Uses the analogy of chemical processing tanks.
- 9/13/2000 - Map of the University
of Arkansas Agricultural Research and Extension Center where
the field experiments were performed that produced the data used
here (farmap02.pdf 76k).
- Scott, H.D., A. Mauromoustakos and J.T. Gilmour. 1995. Fate
of inorganic nitrogen and phosphorous in broiler litter applied
to tall fescue, University of Arkansas Agricultural Experiment
Station, Bulletin 947, Fayetteville, AR 72701, 55p.
- Thiesse, B.R., 1984, Variability of the physical properties
of the Captina soils, M.S. Thesis, Department of Agronomy, University
of Arkansas, Fayetteville, AR USA, 91 p.