Effect of stubble height and irrigation management on the growth, botanical composition and persistence of perennial ryegrass, tall fescue and chicory swards in cool-temperate Tasmania

摘要

The profitability of dairying in south-eastern Australia can be improved by increasing pasture production during summer-autumn, when growth rates for the existing perennial ryegrass (Lolium perenne L.) feedbase are low. A study undertaken in cool-temperate north-west Tasmania examined the effect of stubble height and irrigation management on swards of perennial ryegrass, continental (summer-active) tall fescue (Festuca arundinacea Schreb.) and chicory (Cichorium intybus L.). Irrigation treatments included full irrigation (similar to 20mm applied at every 20mm precipitation deficit), deficit irrigation (similar to 20mm applied at alternate full-irrigation events) and rainfed (no irrigation).