An internet-based smart irrigation approach for limiting phosphorus release from organic fertilizer-amended paddy soil. (15th April 2021)

• Record Type: Journal Article
• Authors: Eltohamy, Kamel Mohamed; Liu, Chunlong; Khan, Sangar; Niyungeko, Christophe; Jin, Yingbing; Hosseini, Seyed Hamid; Li, Fayong; Liang, Xinqiang
• Is Part Of: Journal of cleaner production. Volume 293(2021)
• Publication Date: 2021-04-15
• Subjects: Phosphorus release -- Smart irrigation -- Biogas slurry -- Manure -- Paddy soil; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2021.126254
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: We are still challenged to fully understand to what extent controlling irrigation inputs is important for limiting phosphorus (P) losses from paddy soils and how this affects the contribution of dissolved P (DP), particulate P (PP), and colloidal P (Pcoll ) fractions in P losses. For this investigation, an internet-based smart irrigation system was developed to precisely implement different irrigation scenarios––flooding irrigation (FI) and two water-saving irrigation (WSI) scenarios of intermittent (II) and controlled irrigation (CI). A simulation experiment was conducted and the concentrations of total P (TP), DP, PP, and Pcoll released to floodwater (FW) and leachate (LW) were determined during a rice season after the addition of different P forms (chemical fertilizer (CP), biogas slurry (BP), and manure (MP)) at a rate of 40 kg P·ha −1 . The results revealed that the CI scenario effectively decreased P losses in FW (∼51%) and LW (∼63%) with a positive WSI ratio (39.1%), while II reduced it in FW by ∼11% and in LW by ∼27% with a WSI ratio of 11.0% compared with FI. The BP and MP additions caused a higher risk of P losses than CP under FI, with lower risk under WSI. DP largely contributed to P losses (FW: 30%–71%; LW: 42%–66%); however, more PP was released to FW under II (37%–54% of TP). The Pcoll (FW: 5%–23% and LW: 6%–24%) was more sensitive to release at initial periods after fertilization on account PP. This work provides a promising approach to timely control irrigation inputs, which could limit P losses from paddy soil; however, there remains a need to assess and generalize our initial evidence at field scales. Graphical abstract: Image 1 Highlights: An internet-based irrigation approach was proposed to limit P losses from paddy soil. The controlled irrigation scenario had a better performance for limiting P losses. Colloidal and dissolved P were more release under flooding irrigation. The intermittent irrigation triggered more particulate P release to floodwater. Colloidal P was more sensitive to release at initial periods after fertilization.