Agriculture Reference
In-Depth Information
ment on the need to apply system theory to organic farming and how mainstream organic
farming research is usually conducted (Lockeretz 2000). Obviously, the requirements set forth
by scientific communities as well as shortages in long-term research funding prevent many sci-
entists from adopting a real system approach to organic farming research. However, this
approach would be the most correct in organic systems (Niggli 1997); the hope is then to see it
more frequently applied in future scientific papers.
References
Adams, W.A. and Jan, M.T. 1999. Utilization of nitrogen accumulated by a clover containing
ley following cultivation.
Soil
Use
and
Management
15: 247-253.
Albrecht, H. and Matthei, A. 1998. The effects of organic and integrated farming on rare arable
weeds on the Forschungsverbund Agrarokosysteme Munchen (FAM) research station in
southern Bavaria.
Biological
Conservation
86: 347-356.
Asdal, Å. and Bakken, A.K. 1999. Nutrient balances and yields during conversion to organic
farming in two crop rotation systems. In: Olesen, J.E., Eltun, R., Gooding, M.J., Steen
Jensen, E. and Köpke, U. (eds)
Proceedings
of
the
Workshop
'Designing
and
Testing
Crop
Rotations
for
Organic
Farming'
. Borris, Denmark. DARCOF, Foulum. pp. 125-132.
Bàrberi, P. 2002. Weed management in organic agriculture: are we addressing the right issues?
Weed
Research
42: 176-193.
Bàrberi, P. and Lo Cascio, B. 2001. Long-term tillage and crop rotation effects on weed seed-
bank size and composition.
Weed
Research
41: 325-340.
Belde, M., Mattheis, A., Sprenger, B. and Albrecht, H. 2000. Long-term development of yield
affecting weeds after the change from conventional to integrated and organic farming.
Zeitschrift
für
Pflanzenkrankheiten
und
Pflanzenschutz.
Special Issue S7: 291-301.
Drinkwater, L.E., Janke, R.R. and Rossoni-Longnecker, L. 2000. Effects of tillage intensity on
nitrogen dynamics and productivity in legume-based grain systems.
Plant
and
Soil
227:
99-113.
Eriksen, J., Askegaard, M. and Kristensen, K. 2004. Nitrate leaching from an organic dairy
crop rotation: the effects of manure type, nitrogen input and improved crop rotation.
Soil
Use
and
Management
20: 48-54.
Eyhorn, F., Heeb, M. and Weidmann, G. 2002.
IFOAM
Training
Manual
for
Organic
Agriculture
in
the
Tropics
. FiBL, Frick.
Fließbach, A. and Mäder, P. 2000. Microbial biomass and size-density fractions differ between
soils of organic and conventional agricultural systems.
Soil
Biology
and
Biochemistry
32:
757-768.
Friedel, J.K., Gabel, D. and Stahr, K. 2001. Nitrogen pools and turnover in arable soils under
different durations of organic farming: II: Source-and-sink function of the soil microbial
biomass or competition with growing plants?
Journal
of
Plant
Nutrition
and
Soil
Science-
Zeitschrift
für
Pflanzenernahrung
und
Bodenkunde
164: 421-429.
Gerhardt, R.A. 1997. A comparative analysis of the effects of organic and conventional farming
systems on soil structure.
Biological
Agriculture
and
Horticulture
14: 139-157.
Gruber, H., Handel, K. and Broschewitz, B. 2000. Influence of farming system on weeds in
thresh crops of a six-year crop rotation.
Zeitschrift
für
Pflanzenkrankheiten
und
Pflanzenschutz.
. Special Issue S7: 33-40.
Henriksen, C.B., Søgård, C. and Rasmussen, J. 2000. Kemink subsoiling may stimulate the
growth of sugar beets. In: Alföldi, T., Lockeretz, W. and Niggli, U. (eds)
Proceedings
13th
International
IFOAM
Scientific
Conference
. ETH, Zurich. p. 407.