Abstract
SUMMARYTwo relay intercropping systems were investigated on an irrigated clay soil: first, wheat with a self-regenerating summer legume and, secondly, grain sorghum with a winter growing legume. A range of summer and winter legumes were evaluated. Phasey bean (Macroptilium lathyroides), a free seeding annual, regenerated vigorously as the wheat matured in early summer; cut twice after the wheat harvest it yielded (including the wheat stubble) 7.5 t ha−1 dry matter. Low seed production jeopardized the regeneration of other summer legumes. Subterranean clover (Trifolium subterraneum) regenerated under the maturing grain sorghum crop as did snail medic (Medicago scutellata) and woolly, pod vetch (Vicia dasycarpa). Together with the sorghum stubble they yielded 5–6 t ha−1 between sorghum crops. The benefits of including self-regenerating forage legumes in irrigated grain cropping systems is discussed.
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