Herbage production from deepwater rice
1992
Kupkanchanakul, T. | Kupkanchanakul, K. | Vergara, B.S. (Agronomy, Plant Physiology, and Agroecology Div. | IRRI, Manila (Philippines))
Rice crop has high potential for both herbage and grain production. In a field experiment at the Hantra Rice Experiment Station in Ayutthaya, Thailand, herbage removal from one to three cuttings did not affect grain yield of Pin Gaew 56. Increased number of cuttings significantly increased panicle number per unit area but decreased spikelet number per panicle. Fertility and 1,000-grain weight were not affected by herbage removal and increased number of cuttings. Rice herbage yield was significantly increased by increased number of cuttings and, to some extent, by late cutting at 130 d after emergence. N content and percent crude protein decreased with plant age. However, total protein yield of rice herbage increased with increased number of cuttings because of high herbage yield. Herbage removal decreased plant height and biomass at harvest but increased harvest index and tiller number per unit area. Percent productive tiller and growth duration were not affected by herbage removal. The increased number of cuttings increased rice herbage yield without detrimental effect on grain yield of deepwater rice. This suggests the possibility of increasing the number of cuttings to spread the availability of rice herbage for animal production especially from long growth duration rice cultivars in deepwater areas.
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