Agriculture Reference
In-Depth Information
Pfiffner, L. 1997. Welchen Beitrag leistet der ökologische Landbau zur Förderung der
Kleintierfauna? In: Weiger, H. and Willer , H. (eds)
Naturschutz
durch
ökologischen
Landbau
.
Ökologische
Konzepte
95
. Deukalion Verlag, Holm. pp. 93-120.
Pfiffner, L. and Luka, H. 1999. Overwintering of arthropods in soils of arable fields and adja-
cent semi-natural habitats.
Agriculture,
Ecosystems
and
Environment
78(3): 215-222.
Pfiffner, L. and Mäder, P. 1997. Effects of bio-dynamic, organic and conventional production
systems on earthworm populations.
Biological
Agriculture
and
Horticulture
15: 3-10.
Pfiffner, L. and Niggli, U. 1996. Effects of bio-dynamic, organic and conventional farming on
ground beetles and other epigaeic arthropods in winter wheat.
Biological
Agriculture
and
Horticulture
12: 353-364.
Pimentel, D., Harvey, C., Resosudarmo, P., Sinclair, K., Kurz, D., McNair, M., Christ, S.,
Shpritz, L., Fitton, L., Saffourri, R. and Blair, R. 1995. Environmental and economic cost
of soil erosion and conservation benefits.
Science
267: 1117-1120.
Piorr, A. and Werner, W. 1998.
Nachhaltige
landwirtschafliche
Produktionssysteme
im
Vergleich:
Bewertung
anhand
von
Umweltindikatoren
. Verlags Union Agrar, Frankfurt.
Pomares, F., Olmos, J., Estela, M. and Tarazona F. 1994. Fertilidad de la tierra y estado nutri-
tivo de cítricos en cultivo ecológico.
Actas
del
primer
congreso
de
la
Sociedad
Española
de
Agricultural
Ecologica,
Toledo
.
Pretty, J.N. and Ball, A. 2001.
Agricultural
Influences
on
Carbon
Emissions
and
Sequestration:
A
review
of
Evidence
and
the
Emerging
Trading
Options
. Centre for Environment and Society,
University of Essex.
Pryor, A.W. 2000. Organic certified products as a basis for sustainable management of biologi-
cal reserves: 'Case study of Guayaki biological reserve in Paraguay'. In: Alföldi, T.,
Lockeretz, W. and Niggli, U. (eds)
IFOAM
2000
-
The
World
Grows
Organic:
Proceedings
of
13th
International
IFOAM
Scientific
Conference
. Vdf Hochschulverlag, Zürich.
Raupp, J. 1995. Main effects of various organic and mineral fertilisation on soil organic matter
turnover and plant growth.
Proceedings
of
the
First
Meeting
of
the
Concerted
Action
AIR3-
CT94-1940,
Fertilisation
Systems
in
Organic
Farming
. Institute of Biodynamic Research,
Darmstadt.
Reddersen, J. 1997. The arthropod fauna of organic versus conventional cereal fields in
Denmark.
Biological
Agriculture
and
Horticulture
15: 61-71.
Reenberg, A. and Baudry, J. 1999. Land use and landscape changes - the challenge of compara-
tive analysis of rural areas in Europe. In: Krönert, R., Baudry, J., Bowler, I.R. and Reenberg,
A. (eds)
Land Use Changes and Their Environmental Impact in Rural Areas in Europe
. Man
and the Biosphere Series Volume 24. UNESCO, Paris, and Parthenon Publishing,
Carnforth.
Refsgaard, K., Halberg, N. and Kristensen, E.S. 1998. Energy utilisation in crop and dairy pro-
duction in organic and conventional livestock production systems.
Agricultural
Systems
57: 599-630.
Reganold, J.P. 1988. Comparison of soil properties as influenced by organic and conventional
farming systems.
American
Journal
of
Alternative
Agriculture
3: 144-155.
Reganold, J.P. 1995. Soil quality and farm profitability studies of biodynamic and conventional
farming. In: Cook, H.F. and Lee, H.C. (eds)
Soil
Management
in
Sustainable
Agriculture
.
Wye College Press, Wye. pp. 1-11.
Reganold, J.P., Palmer, A.S., Lockhart, J.C. and Macgregor, A.N. 1993. Soil quality and finan-
cial performance of biodynamic and conventional farms in New Zealand.
Science
260:
344-349.
Reilly, J., Baethgen, W., Chege, F.E., van de Geijn, S.C., Erda, L., Iglesias, A., Kenny, G.J.,
Patterson, D., Rogastik, J., Rotter, R., Rosenzweig, C., Sombroek, W. and Westbrook, J.