The effect of crop rotation on the soil biological activity

The current paper has presented the results of long-term experiments on the study of the biological activity of sod-podzolic soil by the application method in field crop rotations. The experimental part of the work was carried out on the experimental plots of the Mari Research Institute of Agriculture, a branch of the FSBSI FARC of the North-East in 1996–2020. The trials were laid down in 1996 and 1998. The trial was laid down in two factors. Factor A included such types of crop rotations as grain-grasses crop rotations (oats + clover, clover of 1 year of use, winter crops, vetch-oat mixture for grain, spring wheat, barley as a control grain crop); the first rotation of crops (annual leguminous grasses, winter crops, barley, potatoes, vetch-oat mixture for grain, spring wheat); the second rotation of crops (vetch-oat mix[1]ture for grain, spring wheat, potatoes fertilized with manure (80 t/ha), barley + clover, clover of 1 year of use, winter crops); the third rotation of crops (barley + clover, clover of 1 year of use, clover of 2 years of use, winter crops, pota[1]toes, oats). Factor B included application of mineral fertilizers: control grain crop (without fertilizers); N60P60K60. There has been established that the activity of soil microflora mainly depended on the presence of organic matter in the soil. The largest activity of cellulose-destroying microorganisms against a natural background of fertility was identified in the second rotation of crops, with the introduction 23.9% of manure for potatoes in the first period (45 days) and 54.7% in the second period (90 days) of exposure. The slightest biological activity of the soil was identified in the grain-grasses crop rotation (with 83% of grain crops); it was 17.7% in the first 45 days and 43.4% in the second period of exposure. That was caused by the deficit of organic matter. The introduction of mineral fertilizers in a dose of N60P60K60 under pre-sowing tillage significantly increased the soil biological activity in comparison to the unfertilized background, and a fairly high intensity of flax decomposition was observed in the second rotation of crops with 24.9% in 45 days and 56.8% in 90 days. Correlation analysis (1998-2019) between the mean flax decomposition under crops for the entire vegetation period and the value of the hydrothermal coefficient (HThC) showed a close direct correlation, which in the first and second periods of exposure was 0.87–0.90 and 0.86–0.89, respectively.

1. Beresteckij O.A. Biologicheskie osnovy povysheniya plodorodiya pochv [Biological bases of soil fertility improvement] // Aktual'nye problemy zemledeliya. M.: Kolos, 1984. S. 24–34.

2. Dospekhov B. A. Metody polevogo opyta (s osnovami statisticheskoj obrabotki rezul'tatov issledovanij) [Methodology of a field trial (with the basics of statistical processing of study results)]. 5-e izd-e, pererab. i dop. M.: Al'yans, 2014. 351 s.

3. Zamyatin S.A., Apaeva N.N. Biologicheskaya aktivnost', toksichnost' pochvy i porazhenie zernovyh kul'tur kornevymi gnilyami v razlichnyh sevooborotah [Biological activity, soil toxicity and grain crops damage by root rot in various crop rotations] // Agrarnaya nauka Evro-Severо-Vostoka. 2014. № 6(43). S. 37–45.

4. Mishustin E.N., Vostrov I.V. Applikacionnye metody v pochvennoj mikrobiologii i biohimicheskie issledovaniya pochv [Application methods in soil microbiology and biochemical study of soils]. Kiev: Urozhaj, 1971. S. 3–12.

5. Obshchiya E.N., Hripunov A.I. Cellyulozorazlagayushchaya aktivnost' pochvy v usloviyah sklonovyh zemel' landshaftov kak odin iz elementov biologicheskoj aktivnosti pochvy [Cellulosedecomposing soil activity in the conditions of slope landscapes as one of the elements of soil biological activity] // Sel'skohozyajstvennyj zhurnal. 2019. № 2(12). S. 25–28. DOI: 10.25930/004.2.12.2019.

6. Bardgett R.D., Mommer L., De Vries F.T. Going underground: root traits as drivers of ecosystem processes // Trends Ecol. Evol. 2014. № 29. Pp. 692–699. DOI:10.1016/j.tree.2014.10.006.

7. Bisen N., Rahangdale C. P. Crop residues management option for sustainable soil health in rise-wheat system: a review // International Journal of Chemical Studies. 2017. № 5(4). Pp. 1038–1042. Available at: https://www.researchgate.net/publication/318959582_residues_management_option_for_ sustainable_soil_health_in_rise-wheat_sustem_a review.

8. Hirte J. et al. Overestimation of crop root biomass in field experiments due to extraneous organic matter // Front Plant Sci. 2017. № 8. Pp. 284. DOI: 10.3389/fpls.2017.00284.

9. Kuzminykh A.N., Novoselov S.I. and Pashkova G.I. Effect of green manuring on the phytosanitary condition of agrocenosis and the yield of winter rye during the development of fand // IOP Conf. Series: Earth and Environtal Science 421 (2020). 022017. doi:10.1088/1755-1315/421/2/022017.

10. Philippot L., Raaijmakers J.M., Lemanceau P., Van der Putten W.H. Going back to the roots: the microbial ecology of the rhizosphere // Nat. Rev. Microbiol. 2013. № 11. pp. 789–799.DOI:10.1038/ nrmicro3109.