文章基本信息

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