For tussock-covered South Island hill country to be suitable for stock grazing, it needed to be sown with improved pasture species. Plant breeding and selection from the introduced English varieties produced clovers that could establish rapidly and provide a nitrogen source for associated grasses, ensuring a permanent, new, and more productive pasture could be established in a wide range of New Zealand environments. Here Bruce Levy espouses the advantages of improved pasture species over the native varieties.

Sound file from Radio New Zealand Sound Archives Nga Taonga Kōrero. Any re-use of this audio is a breach of copyright. To request a copy of the recording, contact Sound Archives Ngā Taonga Kōrero (Grasslands in retrospect - episode 3/Reference number D831.2a sa-d-00831-02-s01-pm).