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.
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