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Published online 1 September 1971
Published in Agron J 63:786-788 (1971)
© 1971 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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In Vitro Dry-Matter Digestibility of ‘Midland’ Bermudagrass Grown at Several Levels of N Fertilization1

Henry A. Fribourg, Ned C. Edwards, Jr. and Karl M. Barth2

‘Midland’ bermudagrass [Cynodon dactylon (E.) Pers.] was grown at three locations without and with N fertilizer applied at several rates; four replications of a randomized complete block (RCB) design were used at each location. Dry-matter yields of about 4 t/ha were produced by the no-N treatment. This was doubled by adding 133 kg/ha of N and doubled again when 400 kg/ha of N were added. The 800 kg/ha of N treatment produced 2.5 t/ha more than the 400 kg/ha treatment. To ascertain the effects of N fertilization on in vitro dry-matter digestibility (DDM), samples were composited from the four-field replications of each harvest at each location. Four aliquots, one for each of four replications of a 9 * 9 balanced lattice design (173% efficiency compared to RCB) were taken from each composite sample. Each replication was a run using one inoculum from a rumen-fistulated steer fed Midland bermudagrass. The average DDM increased from about 37 to 46% over the range of applied N. The greatest increase occurred as the N rate was increased from 133 to 400 kg/ha. The yield of DDM was increased from about 1.5 to 9.0 t/ha with increasing N applications.

Key Words: Rumen-fistulated digestibility

1 Contribution from the Department of Agronomy and the Department of Animal Husbandry-Veterinary Science, University of Tennessee Agricultural Experiment Station, Knoxville.

2 Professor of Agronomy; formerly Assistant in Agronomy, (now Assistant Agronomist, Mississippi State University); and Associate Professor of Animal Husbandry, University of Tennessee.

Received for publication March 17, 1971.




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Copyright © 1971 by the American Society of Agronomy.