ACTA AGRICULTURAE BOREALI-SINICA ›› 2019, Vol. 34 ›› Issue (5): 192-200. doi: 10.7668/hbnxb.201751758

Special Issue: Oil crops Soil fertilizer

• Resource and Environment·Plant Protection • Previous Articles     Next Articles

Effects of Biochar and Humic Acid on Chemical Properties and Chromium Contents of Chromium-contaminated Soil in Potted Rape

GUO Ru, HONG Jianping   

  1. College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China
  • Received:2019-06-11 Published:2019-10-28

Abstract: The surface soil from the sewage-irrigation area in Liujian village of Taiyuan city was taken as the research object to study the effects of different biochar and humic acid treatments on Cr-contaminated soil in potted rape. The experiment was arranged with three biochar treatments:corn straw biochar (MBC), rice husk biochar (RBC) and wheat straw biochar (WBC), each of which had three doses (0.3%, 0.6% and 0.9%), taking no biochar as the control (CK). The basic chemical properties, enzyme activity and total Cr content of soil were measured. The results showed that different biochar treatments significantly increased the contents of nutrients, and the activities of sucrase, urease and phosphatase in the soil contaminated with heavy metal chromium. With the increase of WSB/RSB/MSB amounts, the contents of nutrients, sucrase and urease increased significantly. Among them, organic matter, available potassium and sucrase changed significantly with the increase of application amount, while total nitrogen, alkali-hydrolyzed nitrogen, total phosphorus and total potassium had no significant difference between the treatments due to the small application gradient. Under different biochar treatments, the available phosphorus content and the activities of phosphatase and catalase in soil all showed the trends of RSB > MSB > WSB. The content of available phosphorus and the activity of phosphatase in soil increased first and then decreased with the increase of dosage. The soil catalase activity increased significantly only in the treatment of 0.3% RSB, but decreased significantly when the dosage increased to 0.9%. Under different biochar treatments, the fixation effect of chromium in soil was obvious, and the content of chromium in rape reduced significantly, but it had no significant difference between different kinds of biochar and between different treatments of doses. The applied amount of biochars was relatively low, and their gradient difference was small, so they could not reach to the minimum limit of adsorption fixation. The corn straw biochar had the best effect, so the further study should pay more attention to the application amount of biochar.

Key words: Heavy metal repair, Chromium contaminated, Biochar, Humic acid, Soil nutrients, Soil enzyme activity, Rapeseed

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Cite this article

GUO Ru, HONG Jianping. Effects of Biochar and Humic Acid on Chemical Properties and Chromium Contents of Chromium-contaminated Soil in Potted Rape[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(5): 192-200. doi: 10.7668/hbnxb.201751758.

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