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Joint International Conference on Long-term Experiments ...

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Thus, by the late 1990s, oil and GLA c<strong>on</strong>tents of overwintered crops in New Zealand<br />

averaged around 28.5% and 12.5% respectively whilst the equivalent data from springsown<br />

crops were 28% and 13.5%. The impact <strong>on</strong> the GLA c<strong>on</strong>tent of the seed was an<br />

increase from around 2.5% in 1990 to over 3.5% by 1999, with spring-sown crops<br />

normally giving the highest results (Fig. 4). The big difference between sowing dates in<br />

1994 is due to the fact that overwintered crops were almost exclusively “Paul” and<br />

“Merlin” whilst all spring-sown crops were “Rigel”. The Scotia breeding programme<br />

closed in 1999 but “Rigel” c<strong>on</strong>tinues to be commercially grown.<br />

GLA c<strong>on</strong>tent of oil (%)<br />

Seed oil c<strong>on</strong>tent (%)<br />

14<br />

13<br />

12<br />

11<br />

10<br />

9<br />

8<br />

29<br />

28<br />

27<br />

26<br />

25<br />

24<br />

1990 1991 1992 1993 1994 1995 1996 1997<br />

Year of harvest<br />

Figure 3: Seed oil c<strong>on</strong>tent and GLA c<strong>on</strong>tent of oil of spring sown crops of evening<br />

primrose harvested in New Zealand in from 1990 to 1997. Cultivars are designated<br />

thus: circles: 421; triangles up: Paul/Peter; squares: Merlin; triangles down: Rigel.<br />

34

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