| Summary: | Experiments were conducted at three sites across southern New South Wales, Australia, over three years (2008 to 2010), to evaluate the agronomic and quality parameters of two wheat (<i>Triticum aestivum</i> L.), two barley (<i>Hordeum vulgare</i> L.), two oat (<i>Avena sativa</i> L.) and one triticale (× <i>Triticosecale</i>) variety, grown as monocultures or in combination with purple vetch (<i>Vicia benghalensis</i> L.). Harvests occurred when individual cereal varieties were at the boot, anthesis, milk and soft/mid dough stage of maturity; though drought conditions or lodging forced some soft/mid dough stage harvests to be abandoned. Yield and species composition of mixed crops were measured and digestibility, crude protein, water soluble carbohydrates and fibre content were determined. Yield differed between years reflective of growing season rainfall, which varied from 185 to 479 mm. Drought conditions in 2008 were associated with low yield, vetch inclusion and fibre content and high digestibility, water soluble carbohydrates and cereal crude protein content. Conversely, very favourable conditions in 2010 were associated with high yield and fibre content, and lower digestibility, water soluble carbohydrates and cereal crude protein content. Addition of vetch increased crude protein content all crops in 2009 and 2010, and 50% of the crops in 2008. Lodging was observed in later harvests of cereal/vetch crops in 2009 and 2010.
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