Open AccessResponse of Andisols to intensive agricultural land use: Implication on changes in P accumulation and colloidal surface charge
Author(s) -
Markus Anda,
Antonius Kasno,
C B Ginting,
Padana Aperta Barus,
Setiyo Purwanto
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/648/1/012016
Subject(s) - allophane , andisol , organic matter , surface charge , macropore , lime , chemistry , soil organic matter , colloid , volcanic ash , environmental chemistry , compost , environmental science , clay minerals , soil science , agronomy , materials science , geology , soil water , mineralogy , metallurgy , geochemistry , catalysis , volcano , mesoporous material , organic chemistry , biology
The response of Andisols to intensive agricultural practices were not fully explored although intensive cultivation has been practiced for a long period of time. The objective of the review is to bring together all findings, which have been documented with the focus on changes in soil organic matter, P content and retention, and colloidal surface charge. The Andisols contain an abundance of nano-clay consisting mainly of hollow allophane spherules forming globular aggregates of about 100 nm in diameter, indicating the large reactive surface area. A huge quantity of P has been accumulated in the uppermost two soil horizons, deriving from residue of continuous application of P fertilizer. Andisols have a strong ability to retain organic C through ligand exchange of metal hydroxyl functional groups with organic functional groups. The soil colloids bear a positive charge at soil pH less than 5. The colloidal negative charge is continuously increased with increasing soil pH over 5.0. Hence, the Andisols should be managed by maintaining soil pH above pH 5.0 by adding lime or compost to allow soil capability to retain cation and reduce P fixation. Nano-clay has positive impact on carbon stabilization and therefore C sequestration.