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KMID : 1025520010430040553
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Journal of Animal Science and Technology
2001 Volume.43 No. 4 p.553 ~ p.560
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Effects of Split Nitrogen Application on Agronomic Characteristics , Forage Yield , and Chemical Composition of Oats in Jeju lsland
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Abstract
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This study was conducted at a volcanic ash soil of Jeju island from 1997 to 1998 to determine the optimum frequency of split N application for forage production of oats. Nitrogen fertilizer was applied with 240㎏ N/ha, and frequencies of the split applications were 1, 2, 3, 4 and 5 times. Days to heading increased from 160 to 163 days as N was split-applied from one to five applications. Plant height was greatest(195.7㎝), followed by nitrogen application of at five applications. Generally plant height was shortest as the number of splitting nitrogen application treatments was decreased. This pattern held for leaf length, leaf width, and culm length which were greatest in four and five applications respectively, but no. of grains per panicle and No. of spikelet per panicle which were increased in three applications with 54.0 and 22.2 respectively. Fresh forage yield increased from 36.63 to 51.70MT/ha, dry matter(DM) yield from 6.47 to 8.43MT/ha, crude protein(CP) yield from 0.75 to 1.20MT/ha, total digestible nutrients(TDN) yield from 3.22 to 4.65MT/ha as N was split-applied from one to four applications, and then decreased to 51.07, 7.63, 1.12 and 4.48MT/ha respectively, in five split applications. Grain yield increased from 4.70 to 5.67MT/ha as N was split-applied from one to three applications and then decreased to 5.07MT/ha in five applications. This pattern held for test weight and 1,000 grains weight which were heaviest in three applications with 366.5 and 37.8g, respectively. Nitrogen uptake increased from 120 to 191.2㎏/ha as N was split-applied from one to four applications, and then decreased to 178.7㎏/ha in five split applications. Nitrogen use efficiency decreased from 53.9 to 42.7 ㎏ DM/kg N with increasing split N applications. Crude protein content increased from 11.6 to 14.6%, ether extract content from 2.3 to 4.0%, nitrogen free extract content from 39.7 to 41.6%, and TDN content from 49.8 to 57.4%, but crude ash content decreased from 8.7 to 6.1% and crude fiber from 31.6 to 27.4% as N was split-applied from one to five applications. These results indicate that the optimum frequency of split N applications is oats in volcanic ash soils of Jeju island.
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