The need for organic soil amendments is increasing in the Republic of Korea against the backdrop of increased soil acidification and nutrient losses. The pyrolysis of biomass produces biochar which not only increases soil productivity but also provides environmental benefits through carbon sequestration. The portion of the brewer’s spent grain (BSG) recycled is by far less than the amount generated, but pyrolysis can help to reverse this trend by turning BSG waste into a valuable soil amendment. The current study, therefore, evaluated the effects of brewer’s spent grain biochar (BBXXX) produced at three different temperatures of 300 °C, 500 °C and 700 °C on the yield and quality characteristics of the leaf lettuce as well as the effects on soil chemical properties through a pot experiment. Each of the BBXXX and BSG were added to the soil at two rates of 2% and 5% by weight. The pH and carbon content of the BBxxx increased with increasing pyrolysis temperatures and the trend was replicated in the soil upon biochar application i.e. the soil pH and carbon content increased alongside temperatures at which biochar was pyrolyzed. On the other hand, however, the soil electrical conductivity (EC) diminished with the increasing pyrolysis temperatures of the biochar applied. With regards to crop growth, the BB500 5% amendment produced the highest marketable yield of the leaf lettuce and while the lettuce grown on the control produced leaf lettuce with the lowest content of nitrate nitrogen, BB500 5% amendment generally produced the highest quality lettuce. The results indicate that BB500 performed agronomically better than the rest of the amendments and is thus recommended as an effective BSG recycling measure.

中文翻译：

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啤酒糟的生物炭对生菜生长和品质的影响（莴苣（Lactuca sativa L. var。crispa。））

在土壤酸化和营养损失增加的背景下，大韩民国对有机土壤改良剂的需求正在增加。生物质的热解产生生物炭，不仅增加了土壤生产力，而且通过固碳提供了环境效益。啤酒厂的废谷物（BSG）回收的部分远远少于所产生的量，但是热解可以通过将BSG废物转化为有价值的土壤改良剂来帮助扭转这一趋势。因此，当前的研究评估了在300°C，500°C和700°C这三种不同温度下酿造的啤酒废谷物生物炭（BBXXX）对生菜产量和品质特性的影响以及对生菜的影响。通过盆栽实验了解土壤化学性质。BBXXX和BSG分别以2％和5％重量的两种比率添加到土壤中。BBxxx的pH和碳含量随热解温度的升高而增加，这种趋势在施用生物炭后在土壤中得以复制，即土壤pH和碳含量随生物炭被热解的温度而升高。但是，另一方面，土壤电导率（EC）随着所施加生物炭的高温分解温度的升高而降低。就作物生长而言，BB500 5％改良剂产生了最高的生菜市场产量，而在对照上生长的生菜产生的硝酸盐含量最低的莴苣，BB500 5％改良剂通常产生了最高质量的生菜。