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KMID : 1025520000420050727
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Journal of Animal Science and Technology
2000 Volume.42 No. 5 p.727 ~ p.734
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Effect of N Fertilizer Levels on the Dry Matter Yield , Quality and Botanical Composition in 8 - Species Mixtures
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Abstract
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The objective of this experiment was to suggest the optimum nitrogen fertilization level, which was considered an environment-conforming grassland farming, for 8-species(seed rate; orchardgrass 40%+tall fescue 20%+perennial ryegrass 10%+Kentucky bluegrass 5%+redtop 5%+red fescue 5%+creeping bentgrass 5%+white clover 10%) mixtures. The field trials were conducted from 1996 to 1999 at Chungnam National University in order to analyze the dry matter yield, botanical composition, quality on the different nitrogen levels. It was arranged in a randomized block design with 4 nitrogen levels: N 0, N 100, N 150, N 200㎏/year/㏊.
With nitrogen levels increasing, the DM yields of 8-species mixtures increased significantly (P$lt;0.05). The CP contents also significantly increased as nitrogen levels increased (P$lt;0.05), but the contents of NDF, ADF, hemi-cellulase, cellulose and lignin decreased. The dry matter digestibility(DMD) increased as nitrogen levels increased. When N 200㎏/㏊ was applied, the DMD showed the highest result of 77.7%. In botanical composition, with increasing nitrogen levels, the botanical composition of 8-species mixtures was changed from bottom grasses type to tall grasses type. Especially, as nitrogen levels increased, orchardgrass and tall fescue in 8-species mixtures also increased, while white clover decreased. The results from this study prove that low applied nitrogen of many species mixture was effective on the various botanical composition and enhanced legume composition, but ineffective on the enhanced of DM yield and quality. Therefore, when N fertilization levels was applied under 200㎏/ha, in order to improve the DM yield and quality, it is required to maintain the botanical composition of tall grasses type such as orchardgrass and tall fescue, and legume in 8-species mixtures.
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