|
KMID : 1025520040460020261
|
|
Journal of Animal Science and Technology
2004 Volume.46 No. 2 p.261 ~ p.272
|
|
|
Studies on a Factor Affecting Composts Maturity During Composting of Swine Manure
|
|
김태일/Kim, T. I.
송준익/양창범/김민균/Song, J. I./Yang, C. B./Kim, M. K.
|
|
|
Abstract
|
|
|
This study was conducted to investigate indices affecting composts maturity for swine manure compost produced in a commercial composting facility with air-forced from the bottom. The composting was made of swine manure mixed with puffing rice hull(6:4) and turned by escalating agitator twice a day. Composting samples were collected periodically during a 45-d composting cycle at that system, showing that indices of Ammonium-N to Nitrate-N ratio were sensitive indicators of composting quality. Pile temperature maintained more than 62℃ and water contents decreased about 20% for 25days of composting. A great variety and high numbers of aerobic thermophilic heterotropic microbes playing critical roles in stability of composts have been examined in the final composts, showing that they were detected 10^(8) to 10^(10) CFUg^(-1) in mesophilic bacteria, 10³-10⁴ in fungi and 10^(6)-10^(8) in actinomycetes, respectively.
The results of this study for determining a factor affecting compost stability evaluations based on composting steps were as follows;
1. Ammonium-N concentrations were highest at the beginning of composting, reaching approximately 421㎎/㎏. However Ammonium-N concentrations were lower during curing, reaching approximately 104㎎/㎏ just after 45 day. The ratio between NH₃-N was above 11 at the beginning of composting and less than 2 at the final step(45 day).
2. Seed germination Indes was dependent upon the compost phytotoxicity and is nutrition. The phytotocity caused the GI to low during the period of active composting(till 25 days of composting time) depending on the value of the undiluted. After 25 days of composting time, the GI was dependent upon compost nutrition. The Germination index of the final step was calculated at over 80 without regard to treatments.
3. E4:E6 ratio in humic acid of composts was correlatively decreased from 8.86 to 6.76 during the period of active composting. After 25 days of composting time, the E4:E6 was consistently decreased from 6.76 to 4.67(r² of total composting period was 0.95).
4. Water soluble carbon had a tendency to increase from 0.54% to 0.78% during the period of active composting. After 25 days of composting time, it was consistently decreased from 0.78% to 0.42%. Water soluble nitrogen increased from 0.22% after 15days of compostion. In consequence, the correlation coefficient(r²) between water soluble carbon and water soluble nitrogen was 0.12 during the period of active composting while was 0.50 after 25 days of composting time.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|