Effect of N fertilization on dry matter yield, total-N, N recovery, and nitrate-N concentration of three cool-season forage grass species

George, J.R.; Rhykerd, C.L.; Noller, C.H.; Dillon, J.E.; Burns, J.C.

Agronomy Journal 65(2): 211-216

1973


ISSN/ISBN: 0002-1962
DOI: 10.2134/agronj1973.00021962006500020008x
Accession: 000067366

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Abstract
In field trials in 1964-5, timothy, smooth brome and cocksfoot were given 0-1344 kg N/ha annually split equally between early spring and after each of up to 4 harvests. In 1964 drought limited yields severely, with the greatest effect on timothy. In 1965 the highest yields of about 11.5 t DM/ha from smooth brome and cocksfoot and 6.8 t DM/ha from timothy were given by 168 and 42 kg N/ha, respectively, at each application. N contents were similar in smooth brome and cocksfoot and generally lower in timothy. The percentage of N recovered in herbage was highest with single applications of 42 kg N/ha with maxima for timothy, smooth brome and cocksfoot of 48.5, 71.8 and 66.6%, respectively. Sod-forming species appeared to use N more efficiently than did bunch grasses. Potentially toxic nitrate-N contents (0.15%) occurred only in smooth brome and cocksfoot when N rates were at or in excess of those giving maximum herbage yields.