M. N. Masyutenko, N. P. Masyutenko, A. V. Kuznetsov, E. V. Dubovik, T. I. Pankova, A. A. Okuneva
Federal Agricultural Kursk Research Center, ul. Karla Marksa, 70 b, Kursk, 305021, Russian Federation
Abstract. TThe studies aimed to study the relationship between the structural and aggregate composition of a typical slightly eroded heavy loamy chernozem and the decomposition of plant residues (PR) of agricultural crops, the content and composition of mobile humic substances (Cmhs), as well as microbial biomass (Cmb). The work was carried out in the Kursk region. The experimental design included the study of the following options: crushed by-products (P); P + nitrogen at the rate of 10 kg of active agent per 1 ton of by-products (N); P + biologies (BP); P+BP+N. Based on the correlation analysis in the soil layer of 0-10 cm, a direct strong and very strong connection was revealed between the amount of buckwheat PR, their decomposition rate (DR), the content of Cmb with the number of agronomically valuable aggregates of 10-0.25 mm (r=0.91-0.93) and 5-0.25 mm (r = 0.88-0.80), in a layer of 10-20 cm, the bond strength with PR increases (r = 0.97-0.90), with DR, Cmb weakens to medium and low. With the share of the blocky fraction, a generally reverse strong and very strong connection was established. The relationship between the amount of Cmhs and mobile humic acids (Cmha) and the share of agronomically valuable aggregates in the studied soil layers was characterised as very strong and strong. Cmhs in the soil layer of 0-10 cm primarily contributed to the formation of aggregates 10-0.25 mm, 5-1 mm, 3-2 mm; Cmha – 5-1 mm, 2-1 mm, mobile fulvic acids – 5-1 mm, 3-2 mm. A strong direct connection was observed between the content of water-stable aggregates (WSA) > 5 mm and PR, CPR, Cmb in the soil layer 0-10 cm, the medium inverse – from 1-0.25 mm and a very strong, strong and medium direct with WSA > 5 mm, 5-1 mm and 3-1 mm in a layer of 10-20 cm. An increase in the content and quality of Cmhs in a soil layer of 0-10 cm contributed to the formation of larger water-stable aggregates >5 mm.
Keywords: orrelation analysis; connection; plant residues; decomposition rate; microbial biomass; mobile humic substances; mobile humic acids; mobile fulvic acids; typical slightly eroded chernozem; by-products.
Author Details: M. N. Masyutenko, Cand. Sc. (Agr.), senior research fellow (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); N. P. Masyutenko, D. Sc. (Agr.), chief research fellow, (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); A. V. Kuznetsov, Cand. Sc. (Agr.), senior research fellow (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); E. V. Dubovik, D. Sc. (Biol.), leading research fellow (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); T. I. Pankova, Cand. Sc. (Biol.), research fellow (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); A. A. Okulova, junior research fellow (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.).
For citation: Masyutenko MN, Masyutenko NP, Kuznetsov AV, et al. [Link between the structural and aggregate composition of a typical slightly eroded chernozem and the content & composition of mobile humic substances during the decomposition of plant residues]. Dostizheniya nauki i tekhniki APK. 2022;36(7):5-11. Russian. doi: 10.53859/02352451_2022_36_7_5.