Effects of superabsorbent polyacrylamide hydrogel and gypsum applications on colloidal phosphorus release from agricultu
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SOILS, SEC 3 • REMEDIATION AND MANAGEMENT OF CONTAMINATED OR DEGRADED LANDS • RESEARCH ARTICLE
Effects of superabsorbent polyacrylamide hydrogel and gypsum applications on colloidal phosphorus release from agricultural soils Seyed Hamid Hosseini 1 & Christophe Niyungeko 2 & Sangar Khan 1 & Xinqiang Liang 1 Received: 8 May 2020 / Accepted: 22 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose The present study aimed to assess the synergistic effects of superabsorbent polyacrylamide hydrogel (SPH) and gypsum on colloidal phosphorus (CP) release from different farmlands (i.e. tea, vegetable, and paddy soils). Materials and methods A laboratory experiment was carried out to examine the effects of SPH at different rates of 0.00, 0.01, 0.05, and 0.1% (w/w) and gypsum at the rates of 0 and 0.005% (w/w) on CP released from different farmland soils. For this purpose, CP, colloidal molybdate–reactive P (MRPc), and colloidal molybdenum–unreactive P (MUPc) were measured in soil solutions. Results and discussion The results revealed that the release of CP, MRPc, and MUPc ranged respectively from 5.20 to 56.65, 1.62 to 39.09, and 0.33 to 37.10% of total P (TP) in soil solutions across three farmland soils. Besides, the soils treated with SPH and gypsum (0.1%) mitigated CP release respectively by 51.75%, 62.64%, 24.13%, and 62.74% for tea, vegetable, silt loam paddy, and loam paddy soils. However, the MRPc release dropped respectively by 40.22%, 41.04%, 38.55%, and 63.70% in tea, vegetable, silt loam paddy, and loam paddy soils, and similar trends were observed in MUPc, namely, 43.72%, 49.37%, 35.71%, and 56.17% respectively in tea, vegetable, silt loam paddy, and loam paddy soils. The results indicated that gypsum could make a binding in the carboxyl group of polyacrylamide (PAM)/SPH and anion CP because of decreased CP release. Conclusions The major form of P was CP, and co-application of PAM/SPH and gypsum could be a promising management approach to moderate CP release from agricultural soils. Keywords Agricultural soil . Colloidal phosphorus . Superabsorbent polyacrylamide hydrogel . Gypsum
1 Introduction Highlights • Synergistic effects of SPH and gypsum decreased the release of CP. • Sole application of SPH augmented CP release from agricultural soils. • Organic matter (OM), pH, and soil texture were regarded as major factors affecting CP release. Responsible editor: Zhaohui Wang * Xinqiang Liang [email protected] 1
Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources Sciences, Zhejiang University, Hangzhou 310058, China
2
Faculty of Sciences, Chemistry Department, University of Burundi, Bujumbura 2700, Burundi
Phosphorus (P) is known as a vital nutrient in crop production. Nevertheless, several agricultural soils fail to supply sufficient amount of P to crops (Maranguit et al. 2017; Khan et al. 2018). To raise soil P levels for better crop yields, P fertilizers are applied (McDowell and Sharpley 2001),
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