Decomposition of Potato Processing Wastes in Soil

Smith, J.H. (1986) Decomposition of Potato Processing Wastes in Soil. Journal of Environment Quality. 15(1):13-16.

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Abstract

Solid filtered or centrifuged potato processing wastes were obtained
from three potato processors in Idaho. The waste samples were dried
and ground to pass a 2-mm sieve and added to soils at rates of 0, 2.5,
10, and 25 g/kg. The 100-g samples of Portneuf silt loam soil containing
the waste material was incubated at 26 °C and decomposition
of the added wastes was determined by measuring CO2 evolution in a
flowing air stream passing over the soil in the incubation flask. Each
increment of added organic waste material increased the amount of
carbon evolved during the 12-week incubation. The waste materials
contained 6.8, 20.4, or 65.5 g N/kg waste. However, these differences
in N did not change the amount of CO2 evolved at the 12-week incubation,
although the evolution curves were shaped somewhat differently
during the 12 weeks. Regression analyses of the cumulative carbon resulted
in highly significant R2 values being obtained for each potato
processing waste material. Decomposition of the solid waste materials
ranged from 24 to 92% depending upon the source and application
rate. The rapid decomposition of the solid wastes verified field research
indicating that potato wastes have not more than 1 yr residual
fertilizer value. The organic waste is not likely to accumulate in the
field.

Item Type:	Article
NWISRL Publication Number:	0563
Subjects:	Irrigated crops > Potato Mass Import - autoclassified (may be erroneous)
Depositing User:	Dan Stieneke
Date Deposited:	20 Nov 2010 21:52
Last Modified:	13 Jan 2017 21:02
Item ID:	446
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/446