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| Humification Characteristics of Different Pig Bio-bed Litters |
| Received:December 05, 2014 |
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| KeyWord:pig bio-bed;litter;humic substances |
| Author Name | Affiliation | E-mail | | ZHANG Xia | Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | LI Sheng | Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | GU Hong-ru | Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | guhongrujs@163.com | | YANG Jie | Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | LI Jian | Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | PAN Xiao-qing | Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | QIN Feng | Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | SHAO Le | Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | LIU Bei-yi | Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | ZHU Hong-long | Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | |
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| Abstract: |
| Humus fractions and their content are indexes for compost quality. The present study investigated the dynamic changes of humus fractions including humic acid(HA) and fulvic acid(FA) in different pig bio-bed litters during one whole period of pig-raising. The litter materials included two groups-fruit tree branches, mushroom cultivation waste, traditional Chinese medicine residues and digested pig manure in one group and different ratios of sawdust and rice husk in another group. The experiment was conducted in a pig bio-bed farm in Luhe animal science base, Jiangsu Academy of Agricultural Sciences, from July 2011 to October 2011. Results showed that total humic acid amount(sum of HA and FA) was highest in the original traditional Chinese medicine residues, while HA content and E4/E6 ratio were highest in the original mushroom cultivation waste. The change patterns of total humic acid amount and FA content in bio-bed litters were different from those in ordinal composts. The amount of total humic acids of bio-bed litters increased in the first three months and then decreased in the fourth month, while FA content of bio-bed litters increased in the first two months and then decreased, with an exception of traditional Chinese medicine residue litter. The HA content increased in the bio-bed litters, except mushroom waste, but E4/E6 ratio decreased in all bio-bed litters during four month of pig-raising. However, total humic acid amount, HA and FA content, and E4/E6 ratios in the bio-bed litters were lower after three pig-raising periods(two years) than after one period(four months). At the same sampling time, total humic acid amount, HA and FA content differed significantly(P<0.05) among traditional Chinese medicine residue, mushroom cultivation waste, fruit tree branches and digested pig manure, but these indexes did not differ significantly(P<0.05) in different ratios of sawdust and rice husk. The E4 /E6 ratios showed significant differences(P<0.05) between different litters, with descending order of digested pig manure >fruit tree branches > mushroom cultivation waste>traditional Chinese medicine residue(except the initial bio-bed litters). The lowest E4 /E6 ratio was found in the 60/40 sawdust/rice husk mixture. |
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