Аннотация:Soil humic substances directly and indirectly influence on wide range of properties
that determine fertility. In particular they effect greatly on soil organic matter and soil
structure. An introduction the humic acids (HA) modified with siloxanes (so called
silsesquioxane humic systems, Si-HA) seems to be one of the most promising approach
for improving soil properties, which are closely connected with soil fertility [1]. However,
the development of this technology requires evaluation of interaction of silsesquioxane
humic systems with wide range of soils.
The goal of our work was to evaluate effect of silsesquioxane humic systems on soil
organic matter properties as well as soil structure of soils belonging to different soilgeographical
zones in Russia.
To reach this goal, a model experiments with soil samples of humic horizons of Sodpodzolic,
Grey forest, Chernozems and Chestnut soils in cultivated and no cultivated
variants. Soils were saturated with HA or Si-HA 5 times, incubated at constant temperature
and moisture during 21 d and dried. Then mean weight diameter (MWD) of water proof
aggregates, microaggregates content (MAC) and ratio of CHA/CFA were estimated.
Introduction to soil both HA and Si-HA increased MWD and MAC, and case of the Si-
HA both MWD and MAC were significantly larger than in the soils treated with HA. CHA/CFA
changed insignificantly in presence of Si-HA as compared to the control values whilst in
case with HA CHA/CFA values considerably increased.
So, the obtained results demonstrated clearly improving soil properties by
silsesquioxane humic systems.
References
1. Volikov A.B. et al. // Catena. 2016. 137:229–236.
This research was supported by the Russian Science Foundation grant 16-14-00167.