SEASONAL DISTRIBUTION OF DRY MATTER PRODUCTION FROM PURE AND OVERDRILLED LUCERNE AND FROM LUCERNEGRASS MIXTURES AS COMPARED WITH PASTURE ON PUMICE COUNTRY

Abstract

Dry matter production data for pure lucerne, overdrilled lucerne and pasture are presented for 14 sites on pumice soils. On average, the annual dry matter yield of lucerne, harvested at early basal shoot movement, was 50% higher than from pasture, ranging from 128% higher on a drought-prone soil where the pasture was dominant browntop to 33% on a more moisture-retentive soil type where the pasture was ryegrass dominant. From April until late October there was little difference in total dry matter between lucerne and pasture, although pasture had a .more even distribution of usable production than lucerne 'managed for maximum yield. Attempts to fill the winter/spring gap in lucerne production through introducing grasses and cereals have met with variable success. It is suggested that, on the more moisture-retentive soils, pasture production could be improved through grazing management and the use of more drought-resistant cultivars. Such an approach may meet the feed demands of animals more closely than an increasing dependence on lucerne with its specific management requirements.