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Soil structure as an ecology forming factor

100%

Medvedev V. V.

nr 2

Peculiarities of development of field crop root systems under different methods of basic soil tillage

63%

Medvedev V. V. , Lyndina T. E.

tom 2B

Long-term organic fertilization effect on chernozem structure

51%

Slowinska-Jurkiewicz A. , Bryk M. , Medvedev V. V.

tom 27

nr 1

The objective of the study was to examine the structure of typical Ukrainian chernozem developed on loess, which (I) had been fertilized by standard crop rotation since 1912 with farm yard manure at the rate of 16 t ha-1 and (II) had not been fertilized with farm yard manure by sugar beet monoculture since 1929. After harvest of winter wheat and sugar beet, the samples of undisturbed structure were taken from 5 layers of both profiles: 0-8, 10-18, 20-28, 30-38, and 40-48 cm. The morphological analysis of the structure of the investigated chernozem revealed that the most visible differences between the soil structures of the two pedons occurred in their superficial layers. The 0-18 cm layer of the soil in the experiment I had an aggregate structure, whereas analogous layer of the soil in experiment II was much more compacted. Below about 30 cm from the ground level both pedons had very similar structure. For the soil in the experiment I an appropriate crop rotation and regular supplies of organic matter allowed for preservation of a favourable structure even in the upper layers – in contrast to the soil in the experiment II.

Agro-ecological problems of soil flooding and underflooding in Ukraine

51%

Medvedev V. V. , Truskavetsky R. S. , Altman K. P.

tom 35

Problems related to soil flooding in Ukraine are discussed. Directions of soil processes and changes in the soil properties under the influence of flooding are reviewed on the basic of an example of a chernozem-meadow soil located close to the Kremenchung water reservoir.

Effect of soil compaction on root growth and crop yield in Central and Eastern Europe

38%

Lipiec J. , Medvedev V. V. , Birkas M. , Dumitru E. , Lyndina T. E. , Rousseva S. , Fulajtar E.

nr 2