Plant introduction trials

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Abstract
During 1978–82, 451 discrete overseas lines of red clover were screened at Palmerston North for agricultural potential. There were 2 successive trials, and some lines were tested in both. The lines were sown in replicated rows and were scored for establishment, seasonal growth, persistence, resistance to leaf diseases, habit, and flowering time over 2½, years. Compared with the best New Zealand-bred selections, most overseas lines did not sustain high yield through all seasons, especially autumn and winter. However, about 20 equalled the best New Zealand lines, and some of these grew better in summer. New Zealand lines were generally superior in persistence and resistance to leaf disease. The best prospects for using overseas material in its present state are for short-term pastures, especially in hay or silage conservation. The most promising lines for this purpose were high-yielding, and more erect and early-flowering than any New Zealand line. The 4 lines from Switzerland were of this type. It might be worth crossing these with the best New Zealand material to improve summer growth in long-term pastures. However, selection to maintain persistence and disease resistance may be necessary.

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