Abstract
The effect of four drill types on the establishment of overdrilled lucerne (Medicago sativa) in a 300–800 mm rainfall tussock grassland environment in New Zealand was examined. The effect of herbicide pre‐treatment and oversowing on plant numbers was also investigated. The highest initial seedling population count was 310 seedlings m−2, but this number declined over three years. All drills established a plant population greater than 56 plants m−2. A prototype roto‐drill gave the highest initial establishment without herbicide because it covered vegetation between coulters and reduced competition, and the triple disc drill had the highest establishment with herbicide. Herbicide pre‐treatment provided higher soil moisture during establishment, increased seedling production, and produced a pure lucerne sward. Lucerne establishment by oversowing was only successful on the herbicide‐treated plots.
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