ABSTRACT

Biochar, a carbon-rich material resulting from pyrolysation, is one of the proposed alternatives as a substrate component to peat. The aim of this study was to investigate the effect of different ratios of peat substitution with a locally available hardwood biochar on the chemical characteristics of growing media, seed germination, plant morphological and nutritional parameters of Tagetes patula. Experimental results show that biochar can be used as a partial peat replacement, showing a complementary liming effect, rising the initial pH of peat (2.8) to values of 4.5 and 7.3 in mixtures with 50% and 75% substitution of peat by biochar, respectively. The mixture with a 50% biochar rate exhibited the strongest change between initial and final pH, rising from 4.5 to 5.7. Increasing content of biochar in the mixtures corresponded to increasing content of total K, Ca, Mg, available K and decreasing level of available Mg. The highest germination percentage was observed in the mixtures with biochar rates from 50% to 100%. Among all substrates, the greatest plant diameter, true leaf area and total root length were measured in the 50% peat substitution mixture, where the highest contents of P, K and Ca in plant shoots were found.

摘要

生物炭是一种由热解产生的富含碳的材料，是作为泥炭基质成分的拟议替代品之一。本研究的目的是调查不同比例的泥炭替代与当地可用的硬木生物炭对万寿菊生长介质化学特性、种子萌发、植物形态和营养参数的影响. 实验结果表明，生物炭可用作部分泥炭替代品，显示出互补的石灰效果，在分别用 50% 和 75% 的生物炭替代泥炭的混合物中，泥炭的初始 pH 值 (2.8) 分别升至 4.5 和 7.3 . 具有 50% biochar 比率的混合物在初始和最终 pH 值之间表现出最强的变化，从 4.5 上升到 5.7。混合物中生物炭含量的增加对应于总钾、钙、镁、有效钾含量的增加和有效镁含量的降低。在具有 50% 到 100% 的生物炭率的混合物中观察到最高的发芽率。在所有基质中，在 50% 泥炭替代混合物中测量的植物直径、真叶面积和总根长最大，其中植物芽中 P、K 和 Ca 的含量最高。