Germination and establishment studies on yarrow (Achillea Millefolium L.): A dissertation submitted in partial fulfilment of the requirements for the Degree of Bachelor of Agricultural Science Honours in the University of Canterbury
1978
Sowden, Jane
Studies to measure the effects of cultivation, cover, nitrogen fertiliser, depth of burial, fluctuating temperature, light and harvest date on germination and establishment of yarrow seedlings were carried out in field, pot and laboratory trials at Lincoln College, 1978. In the field numbers of established seedlings in uncultivated treatments were 5 times those cultivated following sowing. Seedling establishment was greater in short (5 cm) barley stubble than long (40 cm) although there was no effect of these treatments on plant dry weight.The only response to nitrogen was an increase in plant numbers with increase in nitrogen level, in the cultivated treatments. Where seed was buried in pots at a range of depths to 8 cm, the only significant establishment occurred.from that sown on the soil surface. Germination of freshly harvested seed was 37% in darkness increasing with light to 85%, and increasing still further to 90% with fluctuating temperature. Germination was greater in May harvested and germinated seed than that harvested and germinated in March, however greatest germination was in March from 1976 harvested seed. Presence of rhizomes was first noted in field plants 18 weeks from sowing.
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