Long-term biochar addition significantly decreases rice rhizosphere available phosphorus and its release risk to the environment

Abstract

Highlights Long-term (9-years) biochar amendment field and greenhouse pot experiments were conducted. DGT/DIFS/SPRRI were used to in-situ assess P availability, resupply, and release risk to the environment. Long-term biochar addition significantly decreased rice rhizosphere available P and its release risk to the environment. Fe/Al-P and unavailable P dominated the mobility and resupply of P.

Keywords

• Biochar
• Rice rhizosphere
• Phosphorus availability
• DGT
• DIFS
• SPRRI