Utilization of biochar impregnated with anaerobically digested slurry as slow‐release fertilizer |
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| Authors: | Taek‐Keun Oh Yoshiyuki Shinogi Seung‐Joo Lee Bongsu Choi |
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| Affiliation: | 1. National Academy of Agricultural Science, RDA, Suwon 441‐707, South Korea;2. Science for Bioproduction Environment, Faculty of Agriculture, Kyushu University, Hakozaki 6‐10‐1, Higashi‐ku, Fukuoka city 812‐8581, Japan;3. Hanatech Co. Ltd, Kojan‐dong 16 Lot 99 Block, Namdong‐ku, Incheon 405‐820, South Korea;4. National Ecological Institute Planning Office, Gwacheon, Gyeonggi 427‐800, South Korea |
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| Abstract: | We examined the possibility of an environment‐friendly slow‐release fertilizer (SRF) made of biochar impregnated by anaerobically digested slurry. The biochar materials were produced from three types of feedstocks (orange peel, residual wood, water‐treatment sludge) at different temperatures of 300°C, 500°C, and 700°C via pyrolysis. The release behaviors of the water‐soluble K+, Ca2+, and Mg2+ were similar for all impregnated biochars and the commercial SRF used. The water‐retention capacity was greatly improved by mixing the biochar‐SRF with the soil. The yield of lettuce was lower for the biochar‐SRF applications of 3.7 to 34.2 t ha–1 than for the commercial SRF application of 51.4 t ha–1. This might be due to excessive increase of soil pH for the biochar‐SRF application. Based on these results, the authors concluded that the biochar impregnated with nutrients could become an effective slow‐release K+ fertilizer. |
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| Keywords: | biochar anaerobically digested slurry slow‐release fertilizer nutrient efficiency |
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