Department of Food Science and Technology, University of California , One Shields Avenue, Davis, California 95616, United States.
Department of Biological and Agricultural Engineering, University of California , One Shields Avenue, Davis, California 95616, United States.
J Agric Food Chem. 2017 May 3;65(17):3434-3442. doi: 10.1021/acs.jafc.6b04816. Epub 2017 Apr 21.
Anaerobic digestion is an organic waste bioconversion process that produces biofuel and digestates. Digestates have potential to be applied as soil amendment to improve properties for crop production including phytonutrient content and pest load. Our objective was to assess the impact of solid anaerobic digestates on weed seed inactivation and soil quality upon soil biosolarization (a pest control technique that combines solar heating and amendment-induced microbial activity). Two solid digestates from thermophilic (TD) and mesophilic (MD) digesters were tested. The solarized TD-amended samples presented significantly higher mortality of Brassica nigra (71%, P = 0.032) than its equivalent incubated at room temperature. However, biosolarization with digestate amendment led to decreased weed seed mortality in certain treatments. The plant-available water, total C, and extractable P and K were significantly increased (P < 0.05) in the incubated amended soils. The results confirm the potential of digestates as beneficial soil amendments. Further studies are needed to elucidate the impacts of digestate stability on biosolarization efficacy and soil properties.
厌氧消化是一种有机废物生物转化过程，可生产生物燃料和消化物。消化物有可能被用作土壤改良剂，以改善作物生产的特性，包括植物营养素含量和害虫负荷。我们的目的是评估固体厌氧消化物对杂草种子失活和土壤质量的影响，方法是对土壤生物光化（一种将太阳能加热和改良剂诱导的微生物活性相结合的害虫控制技术）进行处理。测试了来自嗜热（TD）和中温（MD）消化器的两种固体消化物。与在室温下孵育的样品相比，经太阳能处理的 TD 处理的样品显著增加了黑芥（Brassica nigra）的死亡率（71%，P = 0.032）。然而，在某些处理中，添加消化物进行生物光化会导致杂草种子死亡率降低。可利用水、总 C、可提取 P 和 K 在孵育的添加土壤中显著增加（P < 0.05）。结果证实了消化物作为有益土壤改良剂的潜力。需要进一步的研究来阐明消化物稳定性对生物光化效果和土壤特性的影响。
