Watering techniques and zero-valent iron biochar pH effects on As and Cd concentrations in rice rhizosphere soils, tissues and yield

Md Shafiqul Islam, Yali Chen*, Liping Weng, Jie Ma, Zulqarnain Haider Khan, Zhongbin Liao, Abdoul Salam Issiaka Abdoul Magid, Yongtao Li

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Zero-valent iron amended biochar (ZVIB) has been proposed as a promising material in immobilizing heavy metals in paddy fields. In this study, the impacts of pH of ZVIB (pH 6.3 and pH 9.7) and watering management techniques (watering amount in the order of CON (control, 5/72)>3/72>1–3/72>3/100>1/72, with 5/72, for example, representing irrigation given to 5 cm above soil surface in 72 hr regular interval) on As and Cd bioavailability for rice and its grain yield (YieldBR) were investigated in a pot experiment. Brown rice As (AsBR) content was irrelative to the watering treatments, while significantly decreased (>50%) with the addition of both ZVIB materials. The diminutions of brown rice Cd (CdBR) content as well as the YieldBR were highly dependent on both the soil amendment materials’ pH and watering amount. Among all the watering treatments, 3/72 treatment (15% less irrigation water than the CON) with ZVIB 6.3 amendment was the optimum fit for simultaneous reduction of AsBR (50%) and CdBR contents (19%) as well as for significant increment (12%) of the YieldBR. Although high pH (9.7) ZVIB application could also efficiently decrease As and Cd contents in brown rice, it might risk grain yield lost if appropriate (e.g. 3/72 in our study) watering management technique was not chosen. Therefore, ZVIB would be an environmentally friendly option as an amendment material with proper selection of watering management technique to utilize As and Cd co-contaminated arable soils safely for paddy cultivation.

Original languageEnglish
Pages (from-to)144-157
JournalJournal of Environmental Sciences (China)
Volume100
Early online date27 Jul 2020
DOIs
Publication statusE-pub ahead of print - 27 Jul 2020

Keywords

  • Brown rice As
  • Brown rice Cd
  • Grain yield
  • Paddy soils
  • Water management
  • Zero-valent iron biochar

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