Agriculture Reference
In-Depth Information
Patriquin, D.G. 1988. Weed control in organic farming systems. In: Altieri, M.A. and Liebman,
M. (eds)
Weed Management in Agroecosystems: Ecological Approaches
. CRC Press, Boca
Raton. pp. 303-317.
Peacock, L. 1990. Practical constraints and opportunities for improving crop protection in
organic vegetable production. In:
Crop Protection in Organic and Low Input Agriculture:
Options for Reducing Agrochemical Usage
. British Crop Protection Council, Surrey. pp.
157-162.
Pekrun, C. and Claupein, W. 2004. The effect of stubble tillage and primary tillage on popula-
tion dynamics of Canada thistle (
Cirsium arvense
) in organic farming.
Journal of Plant
Diseases and Protection, Special Issue
19: 483-490.
Penfold, C. 2000.
Phosphorus Management in Broadacre Organic Farming Systems
. Rural
Industries Research and Development Corporation, Barton.
Penfold, C. 2001. Managing weeds organically. In: RIRDC (ed.) 2001.
The Organic Challenge:
Unity Through Diversity
. RIRDC's Inaugural National Organics Conference 2001. Darling
Harbour, Sydney, Australia, 27-28 August 2001. Rural Industries Research and
Development Corporation, Barton. pp. 120-121.
Pfeiffer, E.E. 1970.
Weeds and What They Tell
. Bio-Dynamic Farming and Gardening
Association, Kimberton.
Plagge, J. 2000. Probleme der Unkrautbekämpfung im Ökologischen Gartenbau aus Sicht der
Praxis. In: Pallut, B (ed.)
Pflanzenschutz im Ökologischen Landbau - Probleme und
Lösungsansätze
-DrittesFachgesprächam2Nov.1999inKleinmachnow'Unkrautregulierung
im Ökologischen Landbau'.
Berichte aus der Biologischen Bundesanstalt für Land- und
Forstwirtschaft
72: 14-16.
Poudel, D.D., Horwath, W.R., Mitchell, J.P. and Temple, S.R. 2001. Impacts of cropping sys-
tems on soil nitrogen storage and loss.
Agricultural Systems
68(3): 253-268.
Pratley, J.E. 2000. Tillage and other physical management methods. In: Sindel, B. (ed.)
Australian
Weed Management Systems
. R.G. and F.J. Richardson, Melbourne. pp. 105-122.
Radics, L. and Székelyné Bognár, E. 2002. Comparison of different mulching methods for
weed control in organic green bean and tomato. In: Cloutier, D.C. (ed.)
Proceedings of the
5th EWRS Workshop on Physical and Cultural Weed Control
. Scuola Superiore Sant'Anna di
studi universitari e di perfezionamento, Pisa, Italy. 11-13 March 2002. European Weed
Research Society, Pisa. pp. 192-204.
Radics, L., Hartl, W., Gal, I., Pusztai, P., Ertsey, A. and Huspeka, C. 2003. Möglichkiten der
Bekämpfung der Ackerkratzdistel (
Cirsium arvense
L.) im Ökologischen Pflanzenbau. In:
Freyer, B. (ed.)
Beiträge zur 7. Wissenschaftstagung zum Ökologischen Landbau - Ökologischer
Landbau der Zukunft
. Universität für Bodenkultur, Wien. pp. 528-531.
Rahkonen, J., Pietikainen, .J and Jokela, H. 1999. The effects of flame weeding on soil micro-
bial biomass.
Biological Agriculture and Horticulture
16(4): 363-368.
Rahmann, G., Nieberg, H., Drengemann, S., Fenneker, A., March, S. and Zurek, C. 2004.
Bundesweite Erhebung und Analyse der verbreiteten Produktionsverfahren, der realisi-
erten Vermarktungswege und der wirtschaftlichen sowie sozialen Lage ökologisch wirt-
schaftender Betriebe und Auf bau eines bundesweiten Praxis-Forschungs-Netzes.
Landbauforschung Völkenrode
276: 427.
Rasmussen, I.A. 2004. The effect of sowing date, stale seedbed, row width and mechanical
weed control on weeds and yields of organic winter wheat.
Weed Research
44(1):
12-20.
Rasmussen, J. 1992. Testing harrows for mechanical control of annual weeds in agricultural
crops.
Weed Research
32: 267-274.
Rasmussen, J. 2003. Punch planting, flame weeding and stale seedbed for weed control in row
crops.
Weed Research
43(6): 393-403.