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題名 | 尼羅草不同割期對產量及品質之影響=Effects of Cutting Stages on Forage Yield and Quality of Nilegrass |
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作 者 | 蕭素碧; 羅國棟; 林正斌; | 書刊名 | 畜產研究 |
卷期 | 32:3 1999.09[民88.09] |
頁次 | 頁219-226 |
分類號 | 437.113 |
關鍵詞 | 尼羅草; 割期; 產量; 品質; Nilegrass; Cutting stage; Forage yield; Quality; |
語文 | 中文(Chinese) |
中文摘要 | 在已建立之尼羅草品系 AC15 草地I,於1995年11月從割後第28天起每隔7天調查 生長情形,結果單枝葉片數從第 28 至 84 天間差異不顯著,乾葉率從割後第 28 天之 21% 增至第 84 天之 50%,乾葉率高會影響乾草品質。株高、分蘗數及乾物產量從第 28 天起每 隔 7 天皆明顯的增加,而株高及乾物產量於 63 天後及分蘗數於 56 天後增加緩慢。 另於 1996 年 4 月至翌年 1 月在尼羅草品系 AC15 草地Ⅱ進行不同割期的試驗,結果株高從 28 天之 67 公分快速伸長,至 63 天已達 126 公分。每次乾物產量隨割期延長而增加,以 63 日為割期每公頃可收 5.31 公噸最高,其次 56 日之 4.87 公噸,但兩者間差異不明顯。而 以年乾物產量計算,以割期為 42、49、56 及 63 日分別為 29.2、29.4、31.8 及 30.7 公 噸╱公頃。 粗蛋白質隨割期的延長而漸減, 於割後 28、35、42、49、56 及 63 天分別為 13.6、14.3、11.7、10.6、10.9 及 9.0%,酸洗及中洗纖維則隨割期的延長而增加, 以 28 日為割期分別為 35.8 及 63.4%, 42 日為 37.7 及 65.2%, 56 日為 40.4 及 70.6%,63 日增至 40.9 及 71.6%。 由上可知尼羅草品系 AC15 若從產量及品質來衡量, 建議割期於 56 日左右可得高產及良好的乾草品質, 但若於生長 42 天左右即抽穗開花時採收,可獲得 更佳的品質。 |
英文摘要 | The development of nilegrass line AC15 was recorded every seven day from the 28th day after cutting to the 84th day in the winter of 1994. Results showed that leaf numbers per plant during this period were not significantly different. The percentage of the brown leaf ranged from 21% on the 28th day to 50% on the 84th day. The high brown leaf percentage would affect hay quality. The plant height, tiller number and dry matter yield all significantly increased with growing days up to the 63th day. In addition, the effects of different cutting days on forage yield and quality of nilegrass line AC15 were observed in 1995. The results showed that plant height grew fast from 67 cm at 28 days after cutting (DAC) up to 126 cm at 63 DAC. The dry matter yield per cut increased as the cutting was delayed. The total dry matter yield in one year were 29.2, 29.4, 31.8 and 30.7 mt/ha/cut at 42, 49, 56 and 63 DAC, respectively. Crude protein contents were 13.6, 14.3, 11.7, 10.6, 10.9 and 9.0% cut at 28, 35, 42, 49, 56 nad 63 DAC, respectively. Both acid (ADF) and neutral (NDF) detergent fibers increased obviously when growth days advanced. ADF were 35.8, 37.7, 40.4 and 40.9% and NDF were 63.4, 65.2, 70.6 and 71.6% at 28, 42, 56 and 63 DAC, respectively. From the above-mentioned results, it is suggested that nilegrass line AC15 would produce the maximum dry matter yield with good quality at 56 DAC. However, it could produce better quality forage at 42 DAC near heading stage, although dry matter yield would decrease a little. |
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