Organic Matter and Sustainability - Sustainable Management of Soil Organic Matter - page 28

Table 1.2.1. Site and soil characteristics of the long-term field experiments.

Established
in

Clay
(g kg − 1 )

Silt
(g kg − 1 )

Sand
(g kg − 1 )

Soil type
(FAO, 1990)

pH
range Location

Bad Lauchstädt
Loamy soil

1902 211 677 212 Haplic Chernozem 5.3-6.5

Müncheberg
Sandy soil

1963 50 210 740 Podzoluvisol to

Arenosol

5.4-5.8

Groß Kreutz
Sandy soil 1967 50 220 730 Albic Luvisol/

Luvisol Arenosol

5.0-6.5

Table 1.2.2. Mean annual input rates of farmyard manure dry matter (FYM dm ) and nitrogen (N)
(kg ha − 1 year −1 ) at Bad Lauchstädt, Müncheberg and Groß Kreutz (Körschens et al., 1990).

Bad Lauchstädt Müncheberg Groß Kreutz

Fertilizer combination FYM dm N FYM dm N FYM dm N

Control 0 0 0 0 0 0

N 0 155 0 150 0 200

FYM 75 385 32 64 50 100

FYM + N 75 520 32 214 50 300

centrifuged. The precipitate was washed free of salt with distilled water and
freeze dried.

FT-IR spectra were obtained using a BioRad®, FTS 135. A KBr
technique (2 mg sample/150 mg KBr) (Celi et al ., 1997) was used to
measure the absorption spectra of SOM extracts.

Results and Discussion

In accordance with Körschens and Müller (1996), the C org content of the
studied loamy and sandy soil increases with fertilizer input. The highest
organic carbon content was found for the FYM + N fertilization and the
lowest for the soil of the control plot for both experiments (Table 1.2.3).
The difference in the C org contents due to the fertilization regime is lower
for the sandy than for the loamy soil. This can be explained by the fact
that the fertilizer application rate in the sandy soil is half that in the loamy
soil. The clay content of the soils may have an additional effect on the C org