Spatial Variability of Agrochemical Parameters of Leached Chernozem in the Forrest- Steppe of the Altai Ob Region

Usenko, V.I.; Litvintseva, T.A.; Chasovskikh, D.V.; Kuzikeeva, A.P.

Dostizheniya nauki i tekhniki APK 31(12): 9-11


ISSN/ISBN: 0235-2451
Accession: 070505473

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The goal of the research was to study the spatial variability of parameters of the effective fertility of leached chernozem depending on the territory organization, slope elements and a forecrop under conditions of the Altai Ob region. The research was carried out in 2017 by the route-by-field method with the taking of soil samples on the fields of the Federal Altai Scientific Center of AgroBioTechnologies with different slope elements, territorial organization, forecrops and their subsequent analysis and data processing by conventional methods. On slope lands with surface runoff, the resources of soil fertility redistribute along the slope. In the soil after bare fallow and wheat the reserves of productive moisture, of nitrate, ammonium nitrogen and mobile phosphorus increased from the upper part of the slope to the middle and the lower part of the slope. The contour (horizontally) organization of the territory reduces surface runoff (to the minimum) and a spatial variation of most of the parameters of the effective fertility of leached chernozem in comparison with the fields, shape and boundaries of which was formed in a natural way. The variation in the reserves of productive moisture decreases from 13-86 to 12-18%, nitrate nitrogen - from 15-36 to 10-34%, ammonium nitrogen - from 8-60 to 4-16%, mobile phosphorus - from 16-18 to 5-17%, potassium - from 34-41 to 20-29%. The greatest influence on the change in the indicators of the effective fertility of leached chernozem was provided by the forecrops: from fallow to pea and wheat in the first and second half a meter of the soil, the variation in the reserves of productive moisture decreased from 15-19 to 13-18 and 3-4%, nitrate nitrogen -from 21-31 up to 28-34 and 13-17%, ammonium nitrogen in the arable layer - from 60 to 17 and 4%, mobile phosphorus - from 16 to 13 and 5%, potassium - from 41 to 18 and 20%. The pH value was the most conservative parameter, the variation of which was less dependent on the external factors.