HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Related articles in JEQ Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (4) Citing Articles via Google Scholar Google Scholar Articles by Petersen, S. O. Articles by Ambus, P. Search for Related Content PubMed PubMed Citation Articles by Petersen, S. O. Articles by Ambus, P. Agricola Articles by Petersen, S. O. Articles by Ambus, P. Related Collections Isotopes Nutrients Spatial Variability Infiltration Animal Waste

Redistribution of Slurry Components as Influenced by Injection Method, Soil, and Slurry Properties

^a Dep. of Agroecology, Danish Inst. of Agric. Sci., P.O. Box 50, DK-8830 Tjele
^b Aalborg Univ., Dep. of Civil Engineering, Sohngaardsholmsvej 57, DK-9000 Aalborg
^c Dep. Automation and System Engineering, Danish Inst. of Agric. Sci., P.O. Box 536, DK-8700 Horsens
^d Risø National Lab., Dep. of Plant Res., P.O. Box 49, DK-4000 Roskilde, Denmark

View larger version (27K): [in a new window]   Fig. 1. A map of Denmark in northern Europe, showing the locations of the two experimental sites at 55°52' N, 9°49' E (Bygholm) and 56°29' N, 9°34' E (Foulum).

View larger version (14K): [in a new window]   Fig. 2. An example of the time course of water loss from slurry due to a water potential gradient. The slurry was enclosed in a dialysis membrane and submerged in a solution of polyethylene glycol (see text).

View larger version (19K): [in a new window]   Fig. 3. The experimental setup used for quantifying the air permeability of soil cores sampled from the wall of simulated injection slits. A constant head pressure of 1 kPa was used for the field measurements.

View larger version (12K): [in a new window]   Fig. 4. Soil moisture and apparent electrical conductivity in and around the injection slit was measured with a small printed circuit-board time-domain-reflectometry probe. (A) Design of the probe, with dimensions in mm. (B) Positions A–D of the four probes installed in each profile; probes were positioned relative to the bottom of the injection slit.

View larger version (15K): [in a new window]   Fig. 5. Injection slits amended with labeled pig and cattle slurry were sampled after 24 h with a rectangular corer (14 x 4 x 8 cm, l x w x h). The blocks were sectioned as indicated.

View larger version (22K): [in a new window]   Fig. 6. The water loss from 22 cattle (white), pig (black), and anaerobically digested (gray) slurries as a function of slurry organic matter content for three selected water potentials. Water was extracted by dialysis with solutions of polyethylene glycol (30, 60, and 90 g L-1). Except for two outliers (square symbols), all measurements accommodated the relationship relative water loss = 1/(1 + aVS); VS = volatile solids, values of a (a function of water potential) (± SE) are inserted in the three plots.

View larger version (17K): [in a new window]   Fig. 7. Relationships between air flow and head pressure for soil (gravimetric soil moisture, 18.6%) compacted by pressures of 6, 12, and 18 kN m-2 (n = 6). The curvilinearity was caused by turbulent flow.

View larger version (31K): [in a new window]   Fig. 8. Volumetric soil moisture () and apparent electrical conductivity (ECa) were measured in and around injection slits between 1 and 13 d after application of pig slurry with disc injection (upper panels) or harrow tine injection (bottom panels). Actual readings are shown in the left-hand column, while the plots in the second () and third columns (ECa) show relative deviations from Position C, the probe installed at a 5-cm distance from the injection slit (see Fig. 4B). The variables x and z refer to, respectively, horizontal and vertical distance relative to the injection slit.

View larger version (32K): [in a new window]   Fig. 9. Volumetric soil moisture () and apparent electrical conductivity (ECa) were measured in and around injection slits between 1 and 13 d after application of cattle slurry with disc injection (upper panels) or harrow tine injection (bottom panels). Actual readings are shown in the left-hand column, while the plots in the second () and third column (ECa) show relative deviations from Position C, the probe installed at 5-cm distance from the injection slit (see Fig. 4B). The variables x and z refer to, respectively, horizontal and vertical distance relative to the injection slit.

View larger version (46K): [in a new window]   Fig. 10. Ratios of atom % 13N to atom % 15N in each of the eight sections sampled in the field experiment with application of labeled slurry to slits prepared by simulated injection.