View in EDS

Assessing the Impact of Starch-Based Phosphorus Fertilizers on Transformation of Inorganic Phosphorus Fractions in Calcareous Soils.

Saved in:
Bibliographic Details
Title: Assessing the Impact of Starch-Based Phosphorus Fertilizers on Transformation of Inorganic Phosphorus Fractions in Calcareous Soils.
Authors: Haider, Md Ali1,2 (AUTHOR), Yang, Jianjun3 (AUTHOR), Liu, Jin1 (AUTHOR) jliu207@cau.edu.cn, Sui, Peng1 (AUTHOR) suipeng@cau.edu.cn, Ahmed, Aziz2 (AUTHOR), Samsi, Fariha Tasnim4 (AUTHOR)
Source: Communications in Soil Science & Plant Analysis. 2025, Vol. 56 Issue 22, p3201-3211. 11p.
Subject Terms: *PHOSPHORUS cycle (Biogeochemistry), *BIOAVAILABILITY, *SOIL fertility, *ENVIRONMENTAL risk, *ORGANIC fertilizers, *CALCAREOUS soils
Abstract: Unlike synthetic fertilizers, organo-mineral fertilizers (OMFs) improve phosphorus use efficiency (PUE) by reducing inorganic phosphorus (Pi) adsorption and precipitation. Starch-bound P fertilizer, renowned for its mobility and efficiency, exhibits unclear Pi transformation mechanisms when incorporated into an OMF formulation that has been investigated in this study to address the gap. We conducted a 16-week greenhouse pot incubation with four treatments: a non-fertilized control (CK), NaH2PO4 (IP), starch-no additionally bound P + IP (SIP), starch-bound P + IP (SP) at a 50 mg P kg−1 (97.5 kg P ha−1) soil application rate per pot; and analyzed incubated soil samples after 1, 4, 8, 12, and 16 weeks using a modified sequential extraction to determine Pi fractions. We found that P fertilizer type significantly influenced Pi distribution and transformation. After one week, IP and SIP predominantly transformed into labile P (Ca2-P) fraction (~60% and ~45% of applied P, respectively), while SP treatment increased Fe-P (48.9 ± 1.94 mg P kg-1 after 16th week, ~33% of applied P) but reducing Ca-P's fixations throughout the study. The transformation rate of applied P to labile P and moderately labile P (Ca8-P) and the decay rate constant of labile P to moderately labile P followed the order of SP < SIP < IP, with an inverse half-life trend. Thus, starch-based OMF (SP > SIP) improved P mobility and extended phyto-availability, minimizing rapid fixation compared to conventional P fertilization. Our findings also suggest a lower short-term environmental risk for starch-bound P-based OMFs. [ABSTRACT FROM AUTHOR]
Database: Academic Search Index
Description
Abstract:Unlike synthetic fertilizers, organo-mineral fertilizers (OMFs) improve phosphorus use efficiency (PUE) by reducing inorganic phosphorus (Pi) adsorption and precipitation. Starch-bound P fertilizer, renowned for its mobility and efficiency, exhibits unclear Pi transformation mechanisms when incorporated into an OMF formulation that has been investigated in this study to address the gap. We conducted a 16-week greenhouse pot incubation with four treatments: a non-fertilized control (CK), NaH2PO4 (IP), starch-no additionally bound P + IP (SIP), starch-bound P + IP (SP) at a 50 mg P kg−1 (97.5 kg P ha−1) soil application rate per pot; and analyzed incubated soil samples after 1, 4, 8, 12, and 16 weeks using a modified sequential extraction to determine Pi fractions. We found that P fertilizer type significantly influenced Pi distribution and transformation. After one week, IP and SIP predominantly transformed into labile P (Ca2-P) fraction (~60% and ~45% of applied P, respectively), while SP treatment increased Fe-P (48.9 ± 1.94 mg P kg-1 after 16th week, ~33% of applied P) but reducing Ca-P's fixations throughout the study. The transformation rate of applied P to labile P and moderately labile P (Ca8-P) and the decay rate constant of labile P to moderately labile P followed the order of SP < SIP < IP, with an inverse half-life trend. Thus, starch-based OMF (SP > SIP) improved P mobility and extended phyto-availability, minimizing rapid fixation compared to conventional P fertilization. Our findings also suggest a lower short-term environmental risk for starch-bound P-based OMFs. [ABSTRACT FROM AUTHOR]
ISSN:00103624
DOI:10.1080/00103624.2025.2557390