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題 名 | 狼尾草青割高度對產量、營養成分及青貯品質之影響 |
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作 者 | 許福星; | 書刊名 | 中華農學會報 |
卷 期 | 151 1990.09[民79.09] |
頁 次 | 頁77-89 |
分類號 | 434.47 |
關鍵詞 | 青割; 青貯; 品質; 狼尾草; 高度; 產量; 營養成分; |
語 文 | 中文(Chinese) |
中文摘要 | 狼尾草(Pennisetum purpureum)為本省栽培的兩種主要牧草品種之一。本試驗目的在探討青割高度對狼尾草雜交品系之產量、營養成分及青貯品質之影響。以狼尾草雜交品系7103、7105、7108及7007等四種及A146為參試品系,最上葉領達1.0、1.5及2.0m時青刈,調查其產量及測定葉及莖部之粗蛋白質、中洗纖維素(NDF)、酸洗纖維(ADF)及試管乾物消化率(IVDMD)。經過三年之生育調查,在青刈高度1.0、1.5及2.0m時,其總鮮重產量分別為687.4、752.7及791.3mt/ha,總乾物產量分別為102.2、123.9及155.5mt/ha,各品系間無論鮮重或乾重均無顯著差異,而各品系產量均有逐年下降之趨勢。青刈高度為1.0、1.5及20m時,其每叢分蘖數平均分別為32.3、26.9及22.2支/叢;葉/莖比分別為1.0、0.78及0.64;青刈間隔日數分別為57.5、68.1及87.8天。青刈愈頻繁,其分蘖數愈多,葉/莖比也愈高。在1.0、1.5及2.0m青刈之葉片粗蛋白質分別為10.8、9.4及8.6%,而莖部粗蛋白質分別為5.0、3.1及2.6%;葉片之NDF分別為70.0、72.8及73.2%,莖為63.3、69.8及70.4%;而葉片之ADF分別為40.9、42.8及43.6%,莖之ADF分別為41.5、48.7及51.1%;葉片之半纖維素分別為29.2、30.1及29.6%,莖部分別為21.8、21.1及19.3%;至於IVDMD在葉片分別為73.8、69.2及67.7%,而莖部分別為73.8、64.5及57.2%,葉及莖部於1.0m青刈時含有相同的IVDMD,但是莖部的IVDMD下降之速度比葉片快。青貯料之品質可因添加玉米粉或麩皮而獲改善,青貯時以添加10%玉米粉之品質最好。狼尾草雜交品系青刈時,建議於最上葉領達1.5~2.0m青割,可生產較多以乾物產量及總可消化養分且能製造較佳品質的青貯料。 |
英文摘要 | Napier grass (Pennisetum purpureum) is one of two major forage species grown in Taiwan. Objectives of theis experiment were to determine the effects of cutting height on forage yield, forage and silage quality of hybrid napier grass. Hybrid strains 7007, 7103, 7105, and 7108, and CV. A146 (CK) were used. Grasses were harvested when the uppermost leaf collar reached 1.0, 1.5, and 2.0m, respectively. Crude protein (CP), acid detergent fiber (ADF), neutral degtergent fiber (NDF), and in vitro dry matter digestibility (IVDMD) of both leaf and stem were determined. Mateials of A146 and Strain 7007 were used to make silage added with or without 5 and 10% corn meal or wheat bran. Volatile fatty acid contents of silage were determined and Flieg's score was used to evaluate silage quality. Total fresh yields cut at 1.0, 1.5, and 2.0m in three growth years were 687.4, 752.7, and 791.3 mt/ha, and total dry matter yields were 102.2, 123.9, and 155.5 mt/ha, respectively. No difference was observed for both fresh and dry matter yields among all entries. However, the yield of each strain decreased year by year. The averaged cutting intervals were 57.5, 68.1, and 87.8 days for cutting at 1.0, 1.5, and 2.0m, respectively. Tillers per clone were 32.3, 26.9, and 22.2, and leaf/stem ratios were 1.0, 0.78, and 0.64 for cutting at 1.0, 1.5, and 2.0m, respectively. The more frequent cut it was, the more tillers and higher leaf/stem ratios were obtained. Forage quality harvested at 1.0, 1.5, and 2.0m was as follows: CP in leaf were 10.8, 9.4, and 8.6%, and those in stem were 5.0, 3.1, and 2.6%; NDF in leaf were 70.0, 72.2, and 73.2%, and those in stem were 63.3, 69.8, and 70.4%; ADF in leaf were 40.9, 42.8, and 43.6%, and those in stem were 41.5, 48.7, and 51.1%; hemicelluloses in leaf were 29.2, 30.1, and 29.6%, and those in stem were 21.8, 21.1, and 19.3%; IVDMD in leaf were 73.8, 69.2, and 67.7%, and those in stem were 73.8, 64.5, and 57.2%, respectively. Both leaf and stem had the same IVDMD cut at 1.0m. However, the IVDMD of stem decreased faster than that of leaf did. The silage quality could be improved by adding with corn meal or wheat bran. It showed that the best quality was obtained when grass was added with 10% corn meal during ensiling. It was suggested that hybrid napier grasses might be harvested when the uppermost leaf collar reached 1.5-2.0m to produce more dry matter and total digestible nutrient and to make better quality of silage. |
本系統中英文摘要資訊取自各篇刊載內容。