Jovanov, Dalibor and Sijakova-Ivanova, Tena and Ilievski, Mite and Ivanova, Violeta (2012) Moisture Retention Characteristics in the Vertisols of the Stip, Probistip and Sv. Nikole Region. Agriculturae Conspectus Scientificus, 77 (2). pp. 69-75. ISSN 1331-7768
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Abstract
Th is paper has studied the moisture retention in the vertisols of the Stip, Probistip
and Sv. Nikole region at eight different tensions (0.1; 0.33; 0.75; 1; 2; 6.25; 11; 15 bars)
using Bar extractor and Pressure membrane extractor. The moisture retention curves
from these data were drawn for each of the soil samples separately. Results showed
that the moisture retention is enormously high throughout the soil profiles depth and
depends primarily on the richness of the parent material in clay and montmorillonite,
and to some extent on pedogenesis (organic matter accumulation, pedoturbation).
Hydropedological constants (field water capacity, wilting point) are in positive correlation
with the clay content, but, in case of equal clay content between some profiles,
every change of the montmorillonite (MLM) content affects the moisture retention
intensiveness. Field water capacity (0.33 bars) varies from 22.47 to 40.47 mass %, or in
average 32.40 mass %. But, in spite of the high water preservation, plants in these soils
are not provided with enough water because the wilting point (15 bars) has also high
values, from 13.55 to 24.68 mass % (average 20.09 mass %). For that reason, available
water capacity is 12.32 mass %, or only 38 mass % of the whole moisture, which is retained
in the soil, is available to plants. The retention curves are relatively close one
to another and do not show big differences between them in the profiles (same mechanical
and clay mineralogical composition, profiles homogeneity). They are almost
horizontal at 2-15 bars in all cases. Th e greatest decline of the curves occurs at lower
pressures (to 2 bars).
| Item Type: | Article |
|---|---|
| Subjects: | Agricultural Sciences > Agricultural biotechnology Agricultural Sciences > Agriculture, forestry, and fisheries |
| Divisions: | Faculty of Agriculture |
| Depositing User: | Dalibor Jovanov |
| Date Deposited: | 02 Nov 2012 11:42 |
| Last Modified: | 20 Nov 2012 11:12 |
| URI: | https://eprints.ugd.edu.mk/id/eprint/302 |
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