Although biochar can be considered as a potential amendment to ameliorate degraded soils with many studies reported, little is known about its effects on acidic soils grown with elephant grass (Pennisetum Purpureum Schumach), a bioenergy crop. The current study aimed to (1) examine the effects of coffee husk-derived biochar on the grass’s yield and properties of acidic soil and (2) identify potential mechanisms in determining the yield. A greenhouse pot experiment was conducted to test five treatments (no biochar – T1, 2% biochar-T2, 4% biochar-T3, 2% cow manure-T4, and a mixture of 1% biochar plus 1% cow manure –T5) in four replicates. The pots were grown with elephant grass for three successive harvests. Soil after each harvest was taken to analyze for 14 parameters, which were used for SQI estimation. Biochar significantly increased the biomass yield by 61 (T2) and 82 % (T3), compared to T1. pH, cation exchange capacity, and the concentration of Mehlich-1 P and exchangeable bases (K, Na, and Ca) were significantly enhanced, while exchangeable acidity and the concentration of exchangeable H⁺, Al, and Fe were significantly decreased following biochar addition. The SQI was significantly better in the biochar-added soil than the non-biochar soil. The improved biomass yield could be involved in a few mechanisms, including liming effect, co-addition of nutrients with the added biochar, and nutrient use efficiency. In brief, biochar is a potential amendment in mitigating the constraints of acidic soils, leading to the enhanced biomass yield of elephant grass in the soils.

虽然生物炭可以被视为改善退化土壤的潜在改良剂，但已有许多研究报道，但对其对象草生长的酸性土壤的影响知之甚少（Penisesetum PurpureumSchumach），一种生物能源作物。当前的研究旨在（1）研究咖啡果壳生物炭对草的产量和酸性土壤特性的影响，以及（2）确定确定产量的潜在机制。进行了温室盆栽试验，以测试五种处理方法（无生物炭-T1、2％生物炭-T2、4％生物炭-T3、2％牛粪-T4，以及1％生物炭加1％牛粪-T5的混合物）一式四份。盆栽有象草，连续收获了三季。每次收获后的土壤都被用来分析14个参数，这些参数用于SQI估算。与T1相比，生物炭显着提高了61（T2）和82％（T3）的生物量产量。pH，阳离子交换容量以及Mehlich-1 P和可交换碱（K，Na和Ca）的浓度显着提高，添加生物炭后，⁺，Al和Fe显着降低。在添加生物炭的土壤中，SQI明显好于非生物炭的土壤。提高的生物量产量可能涉及一些机制，包括石灰效应，营养素与添加的生物炭的共添加以及养分利用效率。简而言之，生物炭是缓解酸性土壤约束的潜在改良剂，可提高土壤中象草的生物量产量。