Assessment of agrogenic impact on tea plantation soils by analysis of their enzymatic activity
https://doi.org/10.24411/2072-0920-2019-10315
Abstract
Brown forest acidic soils of the humid subtropical zone of Russia, on which tea is mainly cultivated, are largely exposed to agrogenic effects, which reduce their bio-productivity. An early diagnosis of these processes is possible by evaluating the biological activity of soils, in particular by the parameters of soil enzymes that regulate the main cycles of biogenic elements. Under the influence of various types and doses of mineral fertilizers relative to the background soils, they have been graduated and a scale for rating the agrogenic load has been developed on the basis of the established actual level of variation in the catalase activity (0.4-13.2 ml of O2/1 g of soil in 1 min), urease (0.1-21.8 mg of NH3/10 g in 24 hours), invertase (21-190 mg of glucose/1 g of soil in 24 hours) and phosphatase (0.01-1.7 mg of P2O5/ 100 g of soil in 1 hour).
Four levels of exposure have been distinguished – permissible, maximum permissible, critical, unacceptable levels. 20 % relative to the soils of the background territory for all studied soil enzymes have been taken for a critically significant value for normalizing agrogenic load for brown forest acidic soils, which determines an unacceptable level. Decrease to 30-70 % of the enzymatic activity of soils in the background territory (depending on the type of enzyme) have been considered maximum permissible and permissible levels.
About the Authors
L. S. Malyukova
FSBSI “All-Russian Research Institute of Floriculture and Subtropical Crops”
Russian Federation
Doctor of Biology, a professor of the Russian Academy of Sciences, a chief researcher of the Laboratory of Agrochemistry and Soil Science
Russian Federation
Doctor of Biology, a professor of the Russian Academy of Sciences, a chief researcher of the Laboratory of Agrochemistry and Soil Science
D. V. Strukova
FSBSI “All-Russian Research Institute of Floriculture and Subtropical Crops”
Russian Federation
Candidate of Biology, a senior researcher of the Laboratory of Agrochemistry and Soil Science
Russian Federation
Candidate of Biology, a senior researcher of the Laboratory of Agrochemistry and Soil Science
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Review
For citations:
Malyukova L.S., Strukova D.V. Assessment of agrogenic impact on tea plantation soils by analysis of their enzymatic activity. New Technologies. 2019;(3):164-172. (In Russ.) https://doi.org/10.24411/2072-0920-2019-10315
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