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- Title
Suitability of Moist Olive Pomace as Soil Amendment.
- Authors
Saviozzi, A.; Levi-Minzi, R.; Cardelli, R.; Biasci, A.; Riffaldi, R.
- Abstract
A laboratory experiment was performed to evaluate the suitability of moist olive pomace (MOP) as soil amendment. Moist olive pomace was obtained from a new olive-oil industrial process called the `two-phases method'. Soil samples were mixed with MOP to approximate a field application of 40 t ha-1 and incubated under aerobic conditions at 20 °C and 60% of soil water holding capacity. To estimate the effect of different loading rates and N supply on mineralization, 40, 80, 120 and 160 t ha-1 of MOP and 200 ppm of N as (NH4)2SO4 were used. Cumulative CO2-C evolution, total microbial activity and biomass-C were monitored during a 60-day period. Results indicate that the CO2-C evolution from MOP depends on soil type and is temporarily inhibited in acidic soils. Evolution of CO2-C increases with incremental addition of MOP, but the percentages of the added C that were mineralized decreased with increasing application rates. Mineral N supplements result in more efficiency of the mineralization process. Among the kinetic models tested to describe the mineralization dynamics, a first-order exponential model including a constant term provides the best fit to the experimental data. Both amount and activity of soil microbial biomass are enhanced by MOP added at the 40 t ha-1 rate, at least in the first period of incubation. At higher rates of MOP addition, a constant increase of biomass C during incubation is observed, while the biological activity decreases at the end of incubation. Following application of mineral N, both amount and activity of microbial biomass is enhanced.
- Subjects
OLIVE; POMACEA; FECAL incontinence; ARTIFICIAL plant growing media; HYDROPONICS
- Publication
Water, Air & Soil Pollution, 2001, Vol 128, Issue 1-2, p13
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1023/A:1010361807181