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| Material flows of phosphorus and potassium in deep litter of swine biobeds |
| Received:January 20, 2016 |
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| KeyWord:phosphorus;potassium;biobed litter;nutrient transformation;material flow |
| Author Name | Affiliation | E-mail | | ZHANG Li-ping | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | SHENG Jing | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | LIU Hong-jiang | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | CHEN Liu-gen | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | ZHENG Jian-chu | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | zhengjianchu@hotmail.com |
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| Abstract: |
| In this study, material flows of phosphorus(P) and potassium(K) in deep litter of swine bio-beds were examined using three kinds of deep litter, i.e., 40% rice husk+60% mushroom bran(FJ), 40% rice husk+60% sawdust(FD), and 40% rice husk+60% vinasse(FW). Phosphorus and K transformations in deep litters and top soils during a feeding period were determined. Results indicated that phosphorus lost mainly via leaching and pig feeding, in which the losses were 15.69, 16.61 and 14.37 kg, respectively, for FJ, FD, and FW. Residual P were 80.74, 52.48, and 84.65 kg in deep litter of FJ, FD and FW, respectively, which accounted for 75%~85% of total P. The rest 14% of P was lost via foraging and leaching. The K losses were 45.95, 33.95, and 63.95 kg, in FJ, FD, and FW, respectively. The residual amount of K was 158, 107 and 136 kg, respectively in FJ, FD and FW, indicating that more than 68%~78% of K was retained in the litter. The loss rate was over 22% due to foraging and leaching. Accumulation of P and K in top soils was found at the bottom of biobed. In order to prevent nutrient losses through leaching, the litter depth of biobed should be more than 50 cm. |
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