Letter | Published:

Effect of Spacing and Nitrogen-level on Floral Initiation in Cocksfoot (Dactylis glomerata L.)

Naturevolume 191pages195196 (1961) | Download Citation



COCKSFOOT, like many perennial herbage grasses, is a long-day plant1, and is reported to have an obligate winter requirement for cold and short days2 or cold alone3, before floral initiation can occur. It has not been possible to satisfy this requirement artificially by cold or short-day treatment given to germinating seed or young seedlings, (Calder, D. M., and Cooper, J. P., unpublished data) although such treatment has been effective in Lolium and the winter cereals1. Preliminary observations suggested that spacing of plants and nitrogen supply might have an overriding influence on flowering in cocksfoot and the following experiment was planned to investigate these effects.

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    Cooper, J. P., Herb. Abstr., 30, 71 (1960).

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    Gardner, F. P., and Loomis, W. E., Plant Physiol., 28, 201 (1953).

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    Wycherley, P. R., Meded. LandbHoogesch. Wageningen, 52, 75 (1952).

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    Gott, M. B., Gregory, F. G., and Purvis, O. N., Ann. Bot., Lond., N.S., 19, 87 (1955).

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    Von Denffer, D., Planta, 31, 418 (1940).

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    Leopold, A. C., Quart. Rev. Biol., 26, 247 (1951).

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    Evans, Gwilym, Welsh Plant Breed. Sta. Ann. Rep., 1959, 88 (1960).

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  1. D. M. CALDER: On study leave from Massey Agricultural College, University of New Zealand.


  1. Welsh Plant Breeding Station, Plas Gogerddan, Nr. Aberystwyth

    • D. M. CALDER
    •  & J. P. COOPER


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