Pasture legumes offer promise to control barnyard grass in delayed permanent water systems in rice

Jhoana Opena1, James Pratley1, Jeffrey McCormick1, Hanwen Wu12, and Deirdre Lemerle1

1 Graham Centre for Agricultural Innovation (Charles Sturt University and NSW Department of Primary Industries), School of Agricultural and Wine Sciences, Locked Bag 588, Wagga Wagga, NSW, 2678,,
2 NSW Department of Primary Industries, Wagga Wagga, NSW, 2650


Australian rice growers endeavour to reduce water use in their rice crops due to high competition for scarce water resources. One method increasing in popularity is to drill sow rice and delay the application of permanent water. This water saving method however, provides an opportunity for the global weed barnyard grass to proliferate. Farmer anecdotes have suggested that the resultant barnyard population is determined to some extent by the lead-in crop or pasture. This paper considers the impact of particular pasture legumes on the barnyard grass seedbank and seedling establishment. Data show that there is some validity in the farmer experience with barnyard grass being inhibited by legume species as the lead-in ‘crop’.


The Australian Society of Agronomy is the professional body for agronomists in Australia. It has approximately 500 active members drawn from government, universities, research organisations and the private sector.

Photo Credits

David Marland Photography Graham Centre for Agricultural Innovation, Charles Sturt University

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