esoilБюллетень Почвенного института имени В.В. ДокучаеваDokuchaev Soil Bulletin0136-16942312-4202V.V. Dokuchaev Soil Science Institute10.19047/0136-1694-2020-101-76-123esoil-539Research ArticleСтатьиКраевой угол смачивания как интегральный показатель физико-химических свойств черноземов Каменной степиThe contact angle of wetting as an integral indicator of physical-chemical properties of Сhernozems of Kamennaya SteppeМатвееваН. В.MatveevaN. V.

Наталья Владимировна Матвеева

Natal'ya V. Matveeva

Nataliy_Matveeva@list.ruМилановскийЕ. Ю.MilanovskyE. Yu.

Евгений Юрьевич Милановский

Evgeniy Yur'evich Milanovsky

milanovskiy@gmail.comХайдаповаД. Д.KhaidapovaD. D.

Долгор Доржиевна Хайдапова

Dolgor D. Khaidapova

dkhaydapova@yandex.ruРоговаО. Б.RogovaO. B.

Ольга Борисовна Рогова

Ol'ga B. Rogova

olga_rogova@inbox.ruПочвенный институт им. В.В. ДокучаеваРоссияV.V. Dokuchaev Soil Science InstituteRussian FederationМГУ им. М.В. ЛомоносоваРоссияLomonosov Moscow State UniversityRussian Federation202027032020010176123Copyright © Матвеева Н.В., Милановский Е.Ю., Хайдапова Д.Д., Рогова О.Б., 20202020Матвеева Н.В., Милановский Е.Ю., Хайдапова Д.Д., Рогова О.Б.Matveeva N.V., Milanovsky E.Y., Khaidapova D.D., Rogova O.B.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://bulletin.esoil.ru/jour/article/view/539

The sessile drop method was used to measure the contact angle of wetting (CA) of ordinary Chernozem from the fields of the Kamennaya Steppe agrolandscape used in various ways. The treatments differ in the intensity of tillage operations (protected mowed steppe, arable land after moldboard plowing), the use of mineral fertilizers and their aftereffect, as well as changes in soil properties under the influence of irrigation. At the same time, the total organic carbon content, C/N ratio, specific surface area, and rheological parameters were determined for the physical and chemical characteristics of soils. The results of the study showed that the hydrophilic-hydrophobic properties of the surface of the solid phase of soils, which largely determine the main structure-forming properties of soils, can be characterized by the value of the wetting edge angle. The CA of the studied soil samples varies from 32 degrees (highest wettability) to 45 degrees (lowest wettability). The lowest wettability is due to the increased content of hydrophobic compounds in the organic matter of soils and is characterized by the highest CA and is typical for native, untreated soil of the mowed steppe, which differs from other studied variants of the experiment in all explored physical and chemical parameters. Moldboard plowing as well as fallowing lead to changes in the physical and chemical properties of the soil and the qualitative composition of organic matter in the direction of their deterioration and a decrease in the CA. The use of mineral fertilizers contributes to the increase in the studied indicator mainly due to changes in plant productivity, in particular, the differences in CA are due to the impact of root secretions and plant residues on the soil properties. For the studied soils, the CA changes in the following series: mowed steppe > arable land with the mineral fertilizers application > arable land undergone the aftereffect of fertilizers. Correlation analysis revealed the relationship of CA with organic carbon content, specific surface area, and rheological characteristics of Chernozems. Thus, CA can serve as an integral indicator of changes in the physical and chemical properties of soils, their degradation changes under the conditions of different agricultural load. The method used in this research for determining CA requires a smaller amount of sample compared to rheological methods and is generally more informative than determining the content of organic matter.

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The authors declare that there are no conflicts of interest present.