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질소분시가 청예피의 생육특성 , 수량 및 조성분 함량에 미치는 영향
조남기,강영길,부창훈 한국동물자원과학회 2001 한국축산학회지 Vol.43 No.2
This study was conducted at a volcanic ash soil of Jeju island in 1999 to determine the optimum frequency of split N application for forage production of Japanese millet [Echinochloa crusgalli var. frumentacea (Roxb.) W. F. Wight]. Nitrogen fertilizer was applied with 200 ㎏ N/㏊, and frequencies of the split applications were 1, 2, 3, 4 and 5 times. A Jeju native cultivar of Japanese millet was planted at a rate of 30 ㎏ seed/㏊ on 31 May, and harvested on 6 September. Days to heading increased from 84 to 88 days as N was split-applied from one to five applications. Plant height increased from 152 to 188 cm as N was split-applied from one to three applications and then decreased to 156 cm in five applications. This pattern held for leaf length, leaf width, and stem diameter which were greatest in three applications with 42.4, 2.6, and 0.67 ㎝, respectively. Green leaf number was 10 regardless of the treatments. Dry matter (DM) yield increased from 6.96 to 11.99 MT/㏊, crude protein (CP) yield from 0.47 to 0.89 MT/ha, and total digestible nutrients (TDN) yield from 3.80 to 6.81 MT/㏊ as N was split-applied from one to three applications, and then decreased to 7.51, 0.63 and 4.43 MT/ha, respectively, in five split applications. Nitrogen uptake increased from 75.1 to 142.9 ㎏/㏊ as N was split-applied from one to three applications and then decreased to 101.3 ㎏/㏊ in five split applications. Nitrogen use efficiency decreased from 92.8 to 74.1 ㎏ DM/㎏ N with increasing split N application. Crude protein content increased from 6.7 to 8.4%, ether extract content from 5.7 to 6.1%, nitrogen free extract content from 30.7 to 34.7%, and TDN content from 48.0 to 53.0%, but crude ash content decreased from 10.2 to 8.0% and crude fiber from 38.9 to 35.5% as N was split-applied from one to five applications. These results indicate that the optimum frequency of split N applications is three times for forage production of Japanese millet in volcanic ash soils of Jeju island.
질소시비수준이 제주재래단지무의 성장 , 수량 및 사료가치에 미치는 효과
조남기,조영일,송창길,오태수,부창훈 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.5
In order to determine the influence of nitrogen on agronomic characters, forage yield and quality, a Cheju Native Danji radish was cultured on the volcanic ash soil at the Experimental Farm of Cheju University under the seven levels of nitrogen rates (0, 50, 100, 150, 200, 250, 300 ㎏/㏊) from April 17 to June 20, 1999. The flowering time was delayed from 52 to 55 days after seeding as the nitrogen rate increased. The plant height increased by increase of nitrogen rate, showing longest at 300 ㎏/㏊ with 93cm and shortest at no application plot with 68㎝. The difference on leaf number and root length by nitrogen rates showed a similar tendency to the plant height. Also total fresh yield, forage and root fresh weight, and forage dry matter were gradually increased by the increase of nitrogen application amount, accordingly the total fresh yield showed the 40.47 MT/㏊ and 83.30 MT/㏊ at 0 and 300 ㎏/㏊ of nitrogen application, respectively. As the nitrogen rate increased from 0 to 300 ㎏/㏊, the content of crude protein and total digestible nutrients significantly increased from 17.1% to 32.2% and from 46.9 to 68.9%, respectively. And the ether extract content and nitrogen free extract content were slightly increased. While the contents of crude ash and crude fiber decreased from 19.7% to 15.8% and from 14.9% to 11.6%, respectively.
질소 시비량이 정예피의 생육특성 , 수량 , 및 조성분 함량에 미치는 영향
조남기,강영길,조영일,부창훈 한국동물자원과학회 2001 한국축산학회지 Vol.43 No.2
A native cultivar of Japanese millet [Echinochloa crusgalli var. frumentacea (Roxb.) W. F. Wight) was grown with N rates of 0, 50, 100, 150, 200, and 250 ㎏/㏊ from 31 May to 6 September in 1999 to determine the optimum N rate for forage production in a volcanic ash soil of Jeju island. Half of N fertilizer rate was applied at planting and half at 60 days after planting. Days to heading increased from 84 to 90 days as nitrogen rate increased from 0 to 250㎏/㏊. Plant height increased from 144 to 183 cm with increasing nitrogen rate. However, there was no significant difference between 200 and 250 ㎏ N/㏊ for the two characteristics. Increasing N rate from 0 to 250 ㎏/㏊ increased dry matter (DM) yield from 6.76 to 12.67 MT/㏊, crude protein yield from 0.47 to 1.21 MT/㏊, and total digestible nutrients (TDN) yield from 3.46 to 7.18 MT/㏊. However, no significant differences in these yields were found between 200 and 250 ㎏ N/㏊. Nitrogen uptake increased from 75.1 to 194.2 ㎏/㏊ but N use efficiency decreased from 90.0 to 65.2 ㎏ DM/㎏ N with increasing N from 0 to 250 ㎏/㏊. As N rate increased from 0 to 250 ㎏/㏊, CP and TDN contents increased from 6.9 to 9.6% and from 51.3 to 56.7%. respectively. while crude fiber content decreased from 39.5 to 35.9%. Ether extract and nitrogen free extract contents increased up to 200 ㎏ N/㏊ and then did not significantly increase with the further increase in N rate. Crude ash content decreased up to 200 ㎏ N/㏊ and then did not significantly decrease with the further increase in N rate. Based on the these findings, the optimum N rate for forage production of Japanese millet seems to be about 200 ㎏/㏊ in volcanic ash soils of Jeju island.