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  • 标题:Effects of Biochar on Phosphorus Sorption and Desorption in Acidic and Calcareous Soils
  • 本地全文:下载
  • 作者:Bayu Dume
  • 期刊名称:Civil and Environmental Research
  • 印刷版ISSN:2225-0514
  • 电子版ISSN:2225-0514
  • 出版年度:2017
  • 卷号:9
  • 期号:5
  • 页码:10-20
  • 语种:English
  • 出版社:The International Institute for Science, Technology and Education (IISTE)
  • 摘要:Awareness of Phosphorus (P) fates when applying biochar to soil is required. Because, P retention and releasing mechanisms provide vital indication for the effective management of P to boost crop production and sustain soil. This study was conducted to evaluate the effects of coffee husk biochar (CHB) produced at two temperatures (350 and 500 0 C) and applied at a rates of (0, 5, 10 and 15t/ha) on phosphorus sorption and desorption in two soils with different P sorption capacities Fe and Al dominated strongly acid (pH=5.08) and Ca dominated alkaline calcareous soil (pH=7.85). Composite air dried, ground and sieved (2mm) soil samples were mixed with biochar and a 2 months incubation experiment was conducted at ambient temperature. In addition, P sorption characteristics of soils amended with biochar and in combination with and without mineral KH 2 PO 4 fertilizer were determined. The results showed significant effects (p<0.05) on selected soil chemical properties by increasing soil pH and reduced exchangeable acidity, exchangeable aluminum, and exchangeable iron in a way that increased the availability of P from 4.52 to 23.21mg/kg (83%) in acidic soil after 2months of incubation and when CHB500 0 C was applied at a rate of 15t/ha and from 8.2 to 27.4mg/kg (70%) in calcareous soil when CHB350 0 C was applied at a rate of 15t/ha. Application of highly alkaline biochars to calcareous soil significantly increased the sorption of P and decreased the availability of P by higher biochar application rates. We concluded that CHB500 0 C and applied at 15t/ha is promising to potentially increase soil P availability in acidic soil and decreased in calcareous soil but, increased in calcareous soil when CHB350 and applied at 15t/ha. Moreover, further researches at field scale are needed to evaluate the effect of biochar on availability and fates of phosphorous in acidic and calcareous soil.
  • 其他摘要:Awareness of Phosphorus (P) fates when applying biochar to soil is required. Because, P retention and releasing mechanisms provide vital indication for the effective management of P to boost crop production and sustain soil. This study was conducted to evaluate the effects of coffee husk biochar (CHB) produced at two temperatures (350 and 500 0 C) and applied at a rates of (0, 5, 10 and 15t/ha) on phosphorus sorption and desorption in two soils with different P sorption capacities Fe and Al dominated strongly acid (pH=5.08) and Ca dominated alkaline calcareous soil (pH=7.85). Composite air dried, ground and sieved (2mm) soil samples were mixed with biochar and a 2 months incubation experiment was conducted at ambient temperature. In addition, P sorption characteristics of soils amended with biochar and in combination with and without mineral KH 2 PO 4 fertilizer were determined. The results showed significant effects (p<0.05) on selected soil chemical properties by increasing soil pH and reduced exchangeable acidity, exchangeable aluminum, and exchangeable iron in a way that increased the availability of P from 4.52 to 23.21mg/kg (83%) in acidic soil after 2months of incubation and when CHB500 0 C was applied at a rate of 15t/ha and from 8.2 to 27.4mg/kg (70%) in calcareous soil when CHB350 0 C was applied at a rate of 15t/ha. Application of highly alkaline biochars to calcareous soil significantly increased the sorption of P and decreased the availability of P by higher biochar application rates. We concluded that CHB500 0 C and applied at 15t/ha is promising to potentially increase soil P availability in acidic soil and decreased in calcareous soil but, increased in calcareous soil when CHB350 and applied at 15t/ha. Moreover, further researches at field scale are needed to evaluate the effect of biochar on availability and fates of phosphorous in acidic and calcareous soil. Keywords : desorption, sorption, acidic soil, calcareous soil
  • 关键词:desorption; sorption; acidic soil; calcareous soil
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