ABSTRACT

Evaluation of liming and fertility properties of biochar on acid soil was studied in this work. Selected soil properties such as pH, electrical conductivity (EC), exchangeable acidity (Ex Ac), exchangeable Al (Ex Al), exchangeable Fe (Ex Fe), available P and, soil organic carbon (SOC) were examined under the effect of biochar amendments. The acid soil was treated with biochar issued from coffee husk (CH) and cocoa pods (CP) pyrolyzed at 350°C and 550°C for 4 hours at amendment rate of 0, 20, 40 and 80 g kg⁻¹ and an incubation time of 7, 14, 30, 40 and 60 d. Biochar amendments significantly increased soil pH, soil EC with respect to control and decrease in exchangeable acidity was observed. Results show that biochar improved available P in acid soil, though re-adsorption occurred with increasing incubation time. A significant increase in SOC is observed as compared to control. The impact of biochar on these acid soil chemical properties is due to the properties which are dependent on the biochar type and pyrolysis temperature. Thus, biochar can play the dual role of a liming agent and a source of P fertilizer nutrients.

摘要

本文研究了生物炭在酸性土壤上的石灰和肥力特性评价。选择的土壤性质，如 pH 值、电导率 (EC)、可交换酸度 (Ex Ac)、可交换铝 (Ex Al)、可交换铁 (Ex Fe)、有效磷和土壤有机碳 (SOC)生物炭修正。酸性土壤用从咖啡壳 (CH) 和可可豆 (CP) 产生的生物炭处理，在 350°C 和 550°C 下以 0、20、40 和 80 g kg ^{-1的修正率热解 4 小时}孵育时间为7、14、30、40和60 d。观察到生物炭改良剂显着增加了土壤 pH 值、相对于对照的土壤 EC 和可交换酸度的降低。结果表明，生物炭提高了酸性土壤中的速效磷，尽管随着培养时间的增加会发生再吸附。与对照相比，观察到 SOC 显着增加。生物炭对这些酸性土壤化学性质的影响是由于性质取决于生物炭类型和热解温度。因此，生物炭可以发挥石灰剂和磷肥养分来源的双重作用。