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The effect of seed rate and nitrogen fertilizer on the yield and nutritive value of oat-vetch mixtures

Published online by Cambridge University Press:  27 March 2009

N. Moreira
N. Moreira
Affiliation:
Universidade de Trás-os-Montes e Alto Douro, Crop Science Department, 5000 Vila Real, Portugal
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Summary

Experiments were conducted on the seed rates of the components of oat-vetch mixtures combined with varying rates of nitrogen fertilizer in a rainfed area of north-east Portugal in 1982–3 and 1984–5.

Forage oats grown alone showed a very high yield response to N and rainfall ranging from 30 to 18·2 t D.M./ha, but had a very low crude protein concentration (37–54 g/kg D.M.) and a poor mineral nutrient composition.

The increased use of vetch in the seed mixture had a buffering effect on dry-matter (D.M.) yield but this depended very much on crop N nutrition. For N-deficient conditions vetch inclusion increased the D.M. yield and had a strong positive effect on total forage crude protein (CP) and mineral composition. When crop N nutrition was good, very high D.M. yields (> 12 t D.M./ha) were possible using a high proportion of oats, with vetch making a reduced contribution to the yield and nutritive value of total forage.

Seed rates suggested in the literature for Mediterranean conditions are adequate for low N inputs and low available soil N, but not for high D.M. yields which can only be obtained by using a higher proportion of oats and adequate N fertilizer.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 112 , Issue 1 , February 1989 , pp. 57 - 66
Copyright
Copyright © Cambridge University Press 1989

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