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Influence of sowing rate on dry matter yield, plant density and survival of lucerne (Medicago sativa) under dryland and irrigated conditions

Published online by Cambridge University Press:  27 March 2009

D. J. Thompson  and
D. G. Stout
D. J. Thompson
Affiliation:
Research Station, Agriculture and Agri-Food Canada, 3015 Ord Road, Kamloops, BC, Canada, V2B 8A9
D. G. Stout
Affiliation:
Research Station, Agriculture and Agri-Food Canada, 3015 Ord Road, Kamloops, BC, Canada, V2B 8A9
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Summary

Lucerne (Medicago sativa L.) sowing rates were evaluated to determine how environmental conditions affect seedling establishment and plant survival. Lucerne (cv. Peace) was sown during 1988 at rates ranging from 2·8 to 11·2 kg ha-1 at one irrigated and two dryland sites (a forest and a mid-elevation grassland site) near Kamloops, British Columbia, Canada. Dry matter (DM) yield was measured for 3 years, and plants were counted to estimate seedling establishment and plant survival. Sowing year DM yield increased linearly with sowing rate at the irrigated and forest sites, but at the mid-elevation grassland site it decreased at sowing rates > 5·6 kg ha-1. In the first full-production year, DM yield levelled off at sowing rates > 8·4 kg ha-1 at the irrigated site and was not affected by sowing rate at the forest site. At the grassland site, first full-production year DM yield decreased at sowing rates > 2·8 kg ha-1. In the second full-production year, there was a linear effect of sowing rate on DM yield at the irrigated site, but it did not affect DM yield at the two dryland sites. At all sites, the percentage of seedlings that survived to the end of the second growing season decreased curvilinearly as seedling density increased. Survival was less at the irrigated site than at the dryland sites. Higher sowing rates are required at irrigated sites than at dryland sites to obtain maximum yield or a required plant population density.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 126 , Issue 3 , May 1996 , pp. 301 - 306
Copyright
Copyright © Cambridge University Press 1996

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