Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 67

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 4 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  wodoodpornosc
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 4 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
The paper presents the most significant results of a five-year research project aimed at examining the aggregate water stability of the main types, kinds, and genera of Polish soils. The investigations included 55 soils representing the main soil textures in Poland. Soil aggregates of a structure, compactness and moisture found in natural conditions were analysed as well the aggregates that were moulded in the lab at controlled conditions of compaction and moisture according to procedures elaborated earlier [3]. Detailed investigations focused on 1 cm³ cylindrical aggregates cut out from natural soils and from soils artificially prepared. The stability of soil aggregates in dynamic and static action of water was analysed and the measurements of a secondary aggregation following that analysis were performed. It was found that soil aggregate resistance to dynamic and static action of water depends, above all, on the soil mechanical composition, mainly on the content of clay fraction. Sometimes a significant effect is also exerted by the content of silt and sand fractions as well as the content of humus. Differences between the aggregates of sandy and clay soils can reach the relation of 1:1000. The resistance of moist aggregates appeared to be several dozen times higher than that of air-dry aggregates. Water stability of soil aggregates also depends on the degree of their compactness. For structure assessment secondary aggregation also seems to be a very important feature as well as the state of a high and relatively stable porosity.
The objective of this study was to evaluate the immediate and subsequent effect of AgroAquaGel 420 polymer applied in doses of 1 and 2 g kg⁻¹ on aggregate-size distribution and aggregate water stability of Haplic Luvisol developed from loess of severely erosion class. The results showed that gel-forming polymer significantly decreased the content of clods above 10 mm in diameter, and significantly increased the content of air-dry aggregates of 0.25-10 mm in surface layer of eroded soil. Application of hydrogel significantly increased the content of water-stable aggregates of 0.25- 10 mm in treated soil as compared with soil of the control. In the second year after application of hydrogel significantly larger content of water-stable aggregates of 0.25-10 mm was found in treated soil. Most effective dose of AgroAquaGel 420 was 2 g kg⁻¹.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 4 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.