Abstract
An experiment to assess the effect of plant density on morphological characteristics, dry matter production and chemical composition of Napier grass (Pennisetum purpureum (L.) Schumach) was conducted in 2004 and 2005 at Haramaya University, eastern Ethiopia. There were a total of nine treatments with 1.5, 1 and 0.5m spacing between rows and 0.75, 0.5 and 0.25m spacing between plants, which consisted of 8,888.9, 13,333.3, 26,667.7, 13,333.3, 20,000, 40,000, 26,667.7, 40,000, and 80,000 plants per ha, arranged in a randomized complete block design with three replications. The plot size was 3m width x 6m length and the spacings between replications and plots were 1.5m and 1m respectively. There was no significant (P > 0.05) effect in morphological characteristics of Napier grass due to plant density during the establishment year. However, the number of tillers, total leaves, internode number, internode length, basal circumference and leaf length per plant were significantly (P < 0.05) affected by plant density in the second year. There was a significant (P < 0.05) difference in dry matter (DM) yield due to plant density. A considerable variation in DM yield between the two years and number of harvests in each year was observed during the study and the DM yield in 2005 was much greater than the 2004 crop season. Higher DM yields were obtained from 80,000 (7.80 t/ha) and 40, 000 (39.9 t/ha) plant density in 2004 and 2005 respectively. There was no significant (P > 0.05) effect on the chemical composition of Napier grass due to plant density. However, the crude protein (CP) content of all the treatments was above 15%, which is the optimum required for animal growth or production. The fibre fractions were also below the threshold level (600 g/kg DM) at which DM intake of cattle is affected. Based on DM yield production and CP content, the production of Napier grass using 40, 000 plants per hectare is recommended to livestock producers in eastern Ethiopia agro-ecologies of the country. Keywords: Chemical Composition; Dry Matter Yield; Morphological Characteristics; Napier Grass; Plant Density East African Journal of Sciences Vol. 2 (1) 2008: pp. 55-61
Highlights
The development of the livestock sub sector in Ethiopia is hindered by many constraints of which unavailability of both high quantity and quality feed is the major factor (Azage et al, 1995)
Based on dry matter (DM) yield production and crude protein (CP) content, the production of Napier grass using 40, 000 plants per hectare is recommended to livestock producers in eastern Ethiopia agro-ecologies of the country
Plant density did not show any significant effect on the chemical composition of Napier grass in the study; the CP content of all the treatments was above the minimum CP level of 75 g/kg required for adequate rumen function in ruminants
Summary
The development of the livestock sub sector in Ethiopia is hindered by many constraints of which unavailability of both high quantity and quality feed is the major factor (Azage et al, 1995). Because of the importance of Napier grass in small-scale livestock farming enterprises, it is one of the most widely-used fodder crops among the livestock producers in Kenya (Annido and Potter, 1994; Kariuki et al, 1998), Pakistan (Butt et al, 1993), USA (Robert et al, 1995), Malaysia, Tanzania (Kidunda et al, 1990) It performs well in the low, mid and highland areas of Ethiopia (Alemayehu, 1997; Seyoum et al, 1998; Tessema and Halima, 1998). It is superior to many other tropical grasses in terms of dry season growth and forage quality (Bayer, 1990) and can support a large number of animal units (Sollenberger et al, 1990) through the cut-and-carry system (Alemayehu, 1997; Kariuki et al, 1998)
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