Effect of Cutting Stage on Forage Yield and Quality of Nilegrass and Pangolagrass

收割期對尼羅草及盤固草產量及品質之影響

許福星(Fu-Hsing Hsu) ； 張世融(Shyh-Rong Chang) ； 洪國源(Kuo-Yuan Hong)

《作物、環境與生物資訊》 2卷4期 (2005/12) Pp. 282-286

https://doi.org/10.30061/CEB.200512.0003

摘要

尼羅草(Acroceras macrum)是C3型多年生禾本科牧草，盤固草(Digitaria decumbens)則為C4型牧草。本試驗研究之目的乃在探討不同割期對尼羅草及盤固草產量及品質之影響。本試驗採用前期收割後生長4、6、8及10週等四個割期，在前三年，尼羅草及盤固草的鮮重及乾重產量均隨著割期的延後而增加，然而在第四年，該兩品種10週收割之產量反而比8週者為低，尼羅草之產量除6週者外，其餘均比盤固草顯著為高。尼羅草及盤固草粗蛋白質含量均隨著割期的延後而降低，而中洗纖維(NDF)及酸洗纖維(ADF)含量則隨割期延後而增加，尼羅草水溶性碳水化合物(WSC)含量於各不同割期間沒有顯著差異，而盤固草的WSC則隨著割期的延後而增加，盤固草各割期的WSC均比尼羅草為高，兩者牧草地土壤中pH值均隨者割期延後而提高，茲建議尼羅草於6及8週收割可獲得較高的產量及品質。

關鍵字

尼羅草 ； 盤固草 ； 收割期 ； 牧草產量 ； 牧草品質

並列摘要

Nilegrass (Acroceras macrum) is a C3 perennial forage grass while pangolagrass (Digitaria decumbens) is a C4 species. The objectives of this study were to determine the effects of different cutting stages on forage yield and quality of nilegrass and pangolagrass. Four cutting stages, i.e., 4, 6, 8 and 10 weeks after the previous cutting, were used in the experiment. Both fresh and dry weights of nilegrass and pangolagrass increased with later cutting stages in the first 3 years. However, the forage yields of these two species cut after 10 weeks were lower than those cut after 8 weeks in the 4(superscript th) year. Nilegrass produced significantly higher forage yield than pangolagrass did for all cutting stages except cutting after 6 weeks. The crude protein contents of both nilegrass and pangolagrass decreased with the delayed cutting stages, while those of neutral detergent fiber (NDF) and acid detergent fiber (ADF) increased with later cutting stages. No significant difference was observed for the contents of water soluble carbohydrate (WSC) of nilegrass among cutting stages. However, WSC of pangolagrass increased with the advancement of cutting stages. Pangolagrass had higher content of WSC than nilegrass did for all the cutting stages. The pH value of the soil increased with cutting stages in forage land cultivated with either nilegrass or angolagrass. Results suggest that nilegrass harvested between 6 and 8 weeks may produce higher forage yield and quality.

並列關鍵字

Acroceras macrum ； Digitaria decumbens ； Cutting stage ； Forage yield ； Forage quality