THE NITROGEN COMPOSITION OF CEREAL GRASSES. I. PRINCIPAL NITROGEN FRACTIONS

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Abstract
The principal N fractions of cereal grasses produced in field culture near Stillwater, Oklahoma were detd. on samples clipped whenever grazing height was reached. Five representative cereals[long dash]Avena sativa var. Wintok; Hordeum vuleare var. Michigan Winter; Secale cereale var. Balbo; Triticum aestivum vars. Tenmarq and Clarkan; and annual ryegrass (Lolium multi-florum,)[long dash]were used. The avg. composition for all spp. on a dry wt. basis was as follows: total N, 32.7; non-protein N, 10.4; non-protein, alpha amino N, 6.1; non-protein N precipitable by Neu-berg''s reagent, 8.2; non-protein N in the Neuberg filtrate, 2; ammonia plus amide N, 2.04; and nitrate N, 0.99 mg./g. A significantly greater portion of the N of annual ryegrass was present in a form precipitable by trichloroacetic acid (protein N). About 60% of the NPN fraction was in the form of amino acids. Significant varietal differences were found in the ammonia plus amide fraction and in nitrate N content. Other components did not show a statistically significant varietal difference. Because of the relatively high N content, most of which is in combined form, these grasses provide a valuable forage crop.

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