Effect of cutting intervals and rates of nitrogen fertilizer on yield and nutritive value of Dwarf Napier grass (Pennisetum purpureum cv. Mott) under intensive management
2006
Phensi Sonprasit(Department of Livestock Development, Bangkok (Thailand). Animal Nutrition Division. Sakaew Animal Nutrition Research and Development Center) | Itthiphon Phaophaisan(Department of Livestock Development, Bangkok (Thailand). Animal Nutrition Division. Khon Kaen Animal Nutrition Research and Development Center) | Prasoet Phochan(Department of Livestock Development, Bangkok (Thailand). Bureau of Livestock Development and Technology Transfer. Tubkwang Research and Technology Transfer Center)
Experiment was conducted to study the effect of 3 cutting intervals (2, 3 and 4 week) and 5 nitrogen fertilizer rates of 0, 40, 80 120 and 160 kg N/rai/yr on yield and nutritive value of dwarf napier grass under intensive management including the use of sprinkler irrigation for 3 hours every 3 days during the rainy season (May-October) with no rain and 5 hours irrigation every 5 days during the dry season (November-April) during May 2001-April 2003 at Sa Kaew Animal Nutrition Research and Development Center. The treatment was arranged in 3*4 factorial in randomized complete block design with 4 replicates. The results showed that there was a significant difference in dry matter yield of dwarf napier grass. Total dry matter yield of 4 week (3,995 kg/rai/yr) and 3 week (3,966 kg/rai/yr) cutting intervals were higher than 2 week (2,880 kg/rai/yr) cutting interval (P LT 0.05). Dry matter yield were 3,760 3,833 4,215 and 4,033 kg/rai/yr under the fertilizer application rates of 40, 80, 120 and 160 kg/Nrai/yr respectively and with no fertilizer was 2,282 kg/rai/yr. For the nutritive value of dwarf napier grass, the results showed that the percentage of crude protein with 2 week cutting interval was highest (18.7 percent). Crude protein concentration was highest for the treatment with 160 kg N/rai/yr giving 18.5 percent CP and the treatment with 120 kg N/rai/yr gave CP concentrations of 17.9 percent with no significant difference (P GT 0.05) and CP was lowest in treatments with 0 kg N/rai/yr giving CP values of 12.1 percent.
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