Tropical Grasslands (1991) Volume 25, 181188
Sustaining multiple production systems
D.L. LLOYD, K.P. SMITH, N.M. CLARKSON, E.J. WESTON and B. JOHNSON
Queensland Department of Primary Industries, Towoomba, Queensland, Australia.
During the 1990s, wheat protein and yield from many cropping soils (mainly vertisols) in the subtropical wheat belt will continue to decline as soil fertility is gradually depleted. One option for maintaining crop yield and quality is ley farming. It has had limited application when soil fertility has been adequate for crops and where the use of N fertiliser has been a viable option. Temperate legumes of the genus Medicago (lucerne and annual medics), and tropical grasses are available for use in leys, but there are currently no suitable tropical legumes.