Abstract Adding biochar at the onset of composting has proven to be beneficial for this process, and when added to the soil, this biochar-blended (BB) compost has outperformed biochar on soil quality but had a similar effect as the compost. Because soil quality gets more and more attention as an important tool for soil health, pot trials were conducted to evaluate the effect of compost and biochar alone, and biochar-blended (BB) compost on disease suppression. In addition, it was investigated whether the disease suppression was associated with changes in soil quality (chemical, physical and biological soil properties). The two selected bio-assays were Rhizoctonia solani (basal rot) on lettuce and potato cyst nematodes (PCN) on potato. Both compost and BB compost released mineral N and thus increased lettuce and potato yield but biochar did not. None of the amendments affected the susceptibly of lettuce leaves to basal rot. Compost suppressed PCN while biochar had no effect on PCN reproduction. Moreover, BB compost reduced the suppressing effect of compost. We suggest that the inhibitory effect of biochar blended in compost might be attributed to the fungal biomass which was not increased in the BB compost-amended soil compared to compost-amended soil, and/or the absorbance of suppressive compounds by the high surface area of biochar. Interestingly, all three amendments reduced the water evaporation from the soil surface, which can have important implications for drought stress of plants.

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在此过程中添加生物炭的堆肥是否比生物炭或堆肥增加了价值以增加疾病抑制？

摘要 在堆肥开始时添加生物炭已被证明有利于这一过程，当添加到土壤中时，这种生物炭混合 (BB) 堆肥在土壤质量方面的表现优于生物炭，但与堆肥的效果相似。由于土壤质量作为土壤健康的重要工具越来越受到关注，因此进行了盆栽试验以评估单独堆肥和生物炭以及混合生物炭 (BB) 堆肥对疾病抑制的影响。此外，研究了疾病抑制是否与土壤质量（化学、物理和生物土壤特性）的变化有关。两个选定的生物测定是生菜上的立枯丝核菌（基腐病）和马铃薯上的马铃薯胞囊线虫 (PCN)。堆肥和 BB 堆肥都释放了矿物质 N，从而增加了生菜和马铃薯的产量，但生物炭没有。没有任何修正案影响生菜叶基腐病的易感性。堆肥抑制 PCN，而 biochar 对 PCN 繁殖没有影响。此外，BB堆肥降低了堆肥的抑制作用。我们认为，混合在堆肥中的生物炭的抑制作用可能归因于与堆肥改良土壤相比，BB 堆肥改良土壤中的真菌生物量没有增加，和/或高表面积对抑制化合物的吸收生物炭。有趣的是，所有三种改良剂都减少了土壤表面的水分蒸发，这对植物的干旱胁迫具有重要意义。BB堆肥降低了堆肥的抑制作用。我们认为，混合在堆肥中的生物炭的抑制作用可能归因于与堆肥改良土壤相比，BB 堆肥改良土壤中的真菌生物量没有增加，和/或高表面积对抑制化合物的吸收生物炭。有趣的是，所有三种改良剂都减少了土壤表面的水分蒸发，这对植物的干旱胁迫具有重要意义。BB堆肥降低了堆肥的抑制作用。我们认为，混合在堆肥中的生物炭的抑制作用可能归因于与堆肥改良土壤相比，BB 堆肥改良土壤中的真菌生物量没有增加，和/或高表面积对抑制化合物的吸收生物炭。有趣的是，所有三种改良剂都减少了土壤表面的水分蒸发，这对植物的干旱胁迫具有重要意义。