Changes of agrophysical parameters of agrarian sod-podzolic soils on the transit direction of the fallow lands at different terms of its overgrowing
Pages: 57-62.
Lednev A.V., DSc in agriculture,
Dmitriev A.V., PhD in agriculture
The Udmurt State Agricultural Research Institute
E-mail: ugniish@yandex.ru
Key areas in which observations were made in the link: arable land, fallow land, forest have been identified according to the materials of the expeditionary soil survey in 2013-2014. It is shown that the overgrowing of agro-sod-podzolic soils in the taiga forest zone will inevitably lead to the differentiation of the arable layer into two sub-layers. Sod process of soil formation is applied to the upper part which leads to reduction in the density of the soil with an average of 1.23 to 0.98 g/cm3, increases the amount of productive moisture and significantly improves the structural state of the sub-layer by reducing cloddy fraction and increasing the number of agronomical valuable aggregates. Zonal podzolic process begins to superimposed on lower part of the arable layer, which leads to a gradual deterioration of the structural state of the underlayer due to the increase of the silt fraction in it. The parameters of change of the agrophysical properties of topsoil depending on the term of overgrowth are revealed. Changing of these parameters confirmed the possibility of time-sharing overgrowing of arable land into three periods: the first period - up to 10 years; second – 10…20 years; the third - more than 20 years.
Keywords: fallow land, density, productive moisture, structure
References
1. Agroekologicheskoe sostoyanie i perspektivy ispol'zovaniya zemel' Rossii, vybyvshikh iz aktivnogo sel'skokhozyaystvennogo oborota. [Agroecological state and prospects of use Russian lands which are leaved from active agricultural rotation]. Edited by Academician G.A. Romanenko. Moscow, 2008. 63 p.
2. Doklad o sostoyanii i ispol'zovanii zemel' v Udmurtskoy Respublike po sostoyaniyu na 1 yanvarya 2013 goda. [Report on the status and use of lands in the Udmurt Republic, as of January 1, 2013]. Izhevsk, 2013.
3. Bondarev A.G, Medvedev V.V. Nekotorye puti opredeleniya optimal'nykh parametrov agrofizicheskikh svoystv pochv. [Some ways to determine the optimum parameters of agro-physical soil properties]. Teoreticheskie osnovy i metody opredeleniya optimal'nykh parametrov svoystv pochv. [Theoretical bases and methods for determining the optimal parameters of soil properties]. Proceedings of the Soil Institute named after V.V. Dokuchaev, 1980. pp. 84-99.
4. Lednev A.V., Dmitriev A.V., Popov D.A. Izmenenie svoystv zalezhnykh zemel', ikh produktivnosti i geobotanicheskogo sostava v protsesse zarastaniya. [Changing the properties of fallow land, their productivity and geobotanical composition during overgrowing]. Innovatsionnye tekhnologii vozdelyvaniya sel'skokhozyaystvennykh kul'tur – osnova vedeniya rastenievodstva v sovremennykh usloviyakh: materialy Vseros. nauch.-prakt. konf., 24-25 iyunya 2014 g. [Innovative technologies of cultivation of agricultural crops - the basics of crop production in modern conditions: Materials of All-Russian scientific-practical conference, June 24-25, 2014]. Izhevsk, 2014. pp. 34-40.
