Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 7

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  water infiltration
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
The objective of this paper is to present a method for determining diurnal distribution of the intensity of effective non rainfall water flux. It was found that the application of TDR technique for the determination of diurnal dynamics of effective non rainfall water flux requires temperature correction of sensed volumetric moisture contents. Without temperature correction the error of estimated non rainfall water flux can be as much as 26%. In addition, the effect of temperature changes on the soil surface was determined in 0.5, 1, 2, 3, 4, and 5 hours periods. It was found that the intensity of effective non rainfall water flux was determined to the greatest extent by the rate of temperature drop during the period of 3 h preceding the non rainfall water flux determination. The agreement of non rainfall water flux calculated with the method proposed and that obtained by the collector was better for dew than for hoarfrost periods.
The physical characteristics of soil aggregates influence soil tilth, surface sealing, water infiltration and root growth. Soil management and compaction significantly affect these characteristics. The aim of this work was to determine the effects of tractor traffic across the slope on bulk density, water stability, tensile strength and sorptivity of aggregates from grass covered and cultivated sloping (18%) vineyard soils. The grass covered (G) treatment included periodical mowing and cutting back of herbage and cultivation (C) treatment consisting of autumn ploughing (18 cm) and spring and summer rotary hoeing in the vineyard inter-row zones (2.7 m). A crawler tractor (2.82 Mg) was used in the inter-row zones, moving across the slope for all tillage and chemical operations. Soil aggregates were taken from the inter-rut and the upper and lower rut areas (0-10 and 20-30 cm) in the inter-row zones and then air-dried. Bulk density and tensile strength were lowest in the inter-rut areas and highest in the lower crawler rut. Aggregate water stability was greater under the lower rut and sorptivity in the inter-rut area in comparison to the remaining inter-row areas. In comparable inter-row areas, water stability and sorptivity of soil aggregates were greater and lower under G than C, respectively. The differences in bulk density and tensile strength between G and C were not consistent and varied depending on the inter-row zone and depth.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 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.