Kenaf (Hibiscus cannabinus L.) is one of the crops that can be cultivated in paddy field. However, waterlogging stress inhibited growth of kenaf in paddy field. The objective of this study was to examine the effect of irrigation methods and intervals on yield of kenaf, cv. ‘Everglades 41’ in paddy field. In Exp. 1, we made a comparison of growth in kenaf under upland condition, under paddy field condition with conventional rice water management practice and under paddy field condition with no flooding. In Exp. 2, kenaf plants were grown under upland and paddy field conditions, to examine the effect of short term flooding on the aboveground yield. Fresh and dry weights of kenaf under paddy field condition with no flooding were the highest of the three growing conditions in Exp. 1. No significant differences in the total aboveground yield were observed between twice-cutting kenaf and once-cutting kenaf in paddy field conditions in Exp. 1. Kenaf showed no significant differences in dry weight between under the paddy field condition with short term flooding and under the upland field condition in Exp. 2. Therefore it was indicated that harvest of twice-cutting kenaf as a forage production in the paddy field was better with the irrigated cultivation which was flooding in young plants period (58-104DAS) than upland field cultivation.

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