ABSTRACT

Through pyrolysis it is possible to transform sewage sludge (SS) into a product called biochar, which can be used safely in agriculture as a soil amendment. Among the advantages of using SS biochar (SSB) are the supply of nutrients and carbon sequestration in the soil. However, there is still a lack of information on the supply of nutrients and the nutritional balance provided by SSB application. The objective of this study was to evaluate the nutritional status of corn plants fertilized with SS biochar by the DRIS method. Soil and plant data from a three-year field experiment were assessed. The field experiment, with four replications, consisted of the following treatments: 1) control, no biochar and no mineral fertilization; 2) mineral fertilization; 3) biochar produced at 300°C; 4) BC300 associated with mineral fertilization; 5) biochar produced at 500°C; 6) BC500 associated with mineral fertilization. In the present study, leaf samples of corn cultivated for three consecutive harvests were used. From the DRIS indexes, it was concluded that potassium is the most limiting nutrient for SSB. Despite that, according to outputs from DRIS, SSB has a good potential as a fertilizer, especially if supplemented with K.

摘要

通过热解，可以将污水污泥 (SS) 转化为一种称为生物炭的产品，该产品可以作为土壤改良剂安全地用于农业。使用 SS 生物炭 (SSB) 的优点之一是提供土壤中的养分和固碳。然而，仍然缺乏关于SSB应用所提供的营养供应和营养平衡的信息。本研究的目的是通过 DRIS 方法评估用 SS 生物炭施肥的玉米植物的营养状况。评估了来自三年田间试验的土壤和植物数据。田间试验，四次重复，由以下处理组成：1）对照，无生物炭，无矿物施肥；2）矿物施肥；3) 300°C生产的生物炭；4）与矿物施肥相关的BC300；5) 500℃生产的生物炭；6) BC500 与矿物施肥有关。在本研究中，使用了连续三年收获的玉米叶片样本。从 DRIS 指数得出的结论是，钾是 SSB 的最大限制营养素。尽管如此，根据 DRIS 的输出，SSB 作为肥料具有很好的潜力，尤其是在补充钾的情况下。