In Vitro Dry-Matter Digestibility of ‘Midland’ Bermudagrass Grown at Several Levels of N Fertilization1
- Henry A. Fribourg,
- Ned C. Edwards 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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