Preface.
Opening lecture: The limits to agriculture.
The substrate: how are we treating the soil?.
When is a plant a weed?.
The increasing need for ecological knowledge in pest control.
Flow of water and nutrients through agro-ecosystems.
Relations between ecosystems in the rural landscape.
Closing lecture
H. Eijsackers and A. Quispel are the authors of Ecological Bulletins, Bulletin 39, Ecological Implications of Contemporary Agriculture: Proceedings of a Symposium held 7-12 September, 1986, at Wageningen, published by Wiley.
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