This paper argues that not only should environmental and ecological be
nefits and economic costs be considered in developing nature conservat
ion policies at the farm level but that farmers' perceptions should al
so be taken into account. Statistical analysis of survey data demonstr
ates the relevance of these behavioural aspects. Arable farmers with e
xperience of unsprayed crop edges indicated that they preferred unspra
yed edges in cereals or grass strips for agronomical, farming equipmen
t related and socio-psychological reasons. The study also focused on t
he ''ideal'' unsprayed crop edge from the farmers' perspective. It app
eared that a flexible width is most important for acceptance in fannin
g practice, because it is, above all, the width that determines compat
ibility with existing farming organisation and parcel lay-out. In this
respect, there was significant differences between regions. With rega
rd to the payment system, farmers prefer a guaranteed reward instead o
f a ''payment for nature'' result, irrespective of the region consider
ed. (C) 1996 Academic Press Limited.