Modified humic substances as soil conditioners: Laboratory and field trials

Kulikova N.A. Volikov A.B. Filippova O.I. Kholodov V.A. Yaroslavtseva N.V. Farkhodov Y.R. Yudina A.V. Roznyatovsky V.A. Grishin Y.K. Zhilkibayev O.T. Perminova I.V.
January 2021 MDPI AG

Agronomy
2021 #11 Issue 1

The paper is devoted to the development and performance testing of a soil conditioner based on leonardite humic substances (LHS) modified with 3-aminopropyltriethoxysilane (APTES). The modified HS were obtained by adding APTES to LHS solution at different mass ratios of LHS and APTES, followed by the investigation of siloxane structures using³¹Si NMR spectroscopy. The Urbic Technosol was used as a model soil. The size and amount of water-stable soil aggregates were estimated using wet sieving and laser diffraction, respectively. Toxicity was evaluated by monitoring microbial substrate-induced respiration (SIR) and seedling bioassay. Laboratory column experiments demonstrated an increase in water-stability of the 3–5 mm soil aggregates after LHSAPTES application. Field tests showed an increase in the average weighted diameter of micro aggregates (from 59 to 73 µm) and water-stable macroaggregates (from 1.6 to 2.9 mm) due to the LHS-APTES amendment. A substantial increase in SIR from 5 to 9 mg CO₂ (kg h)⁻¹ was detected. Better survival of seedlings was observed. The obtained beneficial results indicate that APTESmodified HS can be successfully used as a soil conditioner. The formation of extended siloxane networks was suggested as the main mechanism of the observed improvement in the structure of the amended soils.

Polyelectrolyte complexes , Siloxane , Soil structure , Urbic Technosol , Water-stable aggregate

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Department of Soil Science, Lomonosov Moscow State University, Leninskiye Gory 1-12, Moscow, 119991, Russian Federation
Fundamentals of Biotechnology Federal Research Center, Bach Institute of Biochemistry, Russian Academy of Sciences, pr. Leninskiy 33, Moscow, 119071, Russian Federation
Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, Moscow, 119991, Russian Federation
Dokuchaev Soil Science Institute, Pyzhyovskiy Lane 7 Build. 2, Moscow, 119017, Russian Federation
Department of Chemistry, Al Farabi Kazakh National University, 71 al-Farabi Ave., Almaty, 050040, Kazakhstan
InterAgroTech LLC, Almaty, 050040, Kazakhstan

Department of Soil Science
Fundamentals of Biotechnology Federal Research Center
Department of Chemistry
Dokuchaev Soil Science Institute
Department of Chemistry
InterAgroTech LLC

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