Abstract
Pig slurry is a good soil amendment not only because of its high organic matter content, but also because of its ability to provide various nutrients. The objective of this study was to estimate the influence of raw and processed pig slurry application on pot soil over chemical fertilizer and non-amended control soil. Change in the chemical parameters (pH, organic matter (OM), organic carbon (OC), macro and micronutrients) and microbial mass of the treated soils were monitored over 30 to 90 days. Pot soil was treated with the recommended dose of pig slurry and chemical fertilizer, and was sampled after 30, 60 and 90 days of incubation. The least significanct difference (p<0.05) was observed on Fe, Cu, Zn, available P and K between treatments. All treatments increased N, P and K content and microbial mass of soil over control soil. Interestingly, no significant effects were detected on OM, OC, total bacteria, actinomycetes and fungi mass in soil irrespective of treatments given. However fungal and bacterial counts, as well as available nutrients, were found to be higher in processed slurry (PS)-treated soil compared to other soils. In general a significant correlation existed between the fungal count and OM, OC, Zn, T Kjeldahl N (TKN), available P and K of soil. A strong negative correlation was observed between pH and Fe in soil. This study clearly demonstrated that the use of processed manure as a fertilizer could be a key for sustainable livestock agriculture.
Highlights
The conventional land application of raw and aerobically aged pig slurry has been increasing in Korea in response to the yearly increasing pig production rate (Dong, 2000)
PH was significantly differ between chemical fertilizer (CF) and raw pig slurry (RS) only, Soil chemical analysis because ammonia is a main cause for pH changes in soil
There was no significance observed between treatments for phosphorous showed difference between C and processed slurry (PS), RS
Summary
The conventional land application of raw and aerobically aged pig slurry has been increasing in Korea in response to the yearly increasing pig production rate (Dong, 2000). Direct application of pig slurry to soil may induce changes in soil microbial and biochemical activities, which need thorough investigation (Bandick and Dick, 1999). Organic matter amendments to soils show particular interest, because of their effects on soil physical, chemical and biological fertility, and because their buffering effect reducing soil pollution caused by an excessive or unbalanced use of mineral fertilizers (Rauhe, 1987, Hall, 1999). The effect on microbial mass of soil by the application of organic amendments has become a very interesting subject of investigation, their importance in soil. As analytical methods based on soil chemical data do not always predict overall soil functions, attempts have been made to use biological responses as indicators for evaluating possible impacts of biological wastes application into soil (Islam, 2003; Araujo, 2006; Kaku, 2004; Rahman, 2008).
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