Effect of toposequence on rice (Oryza sativa l.) by intermittent irigation in Bali

Abstract

The research of toposequence effect on rice aims to study effect of toposequence on rice planting season by different way of irrigation in Yeh Ho watersheds Tabanan Bali. This research used some varieties of rice namely Mekongga, Inpari 1 and Inpari 10 Laeya. The result showed that toposequence had significant effect on milled dry paddy (GKG). Upstream toposequence able to produce rice about 6450 kg ha−1, middle was about 6460 kg ha−1 and downstream was about 7260 kg ha−1 by significantly different. Irrigation interval every eight days capable to produce 7400 kg ha−1 of rice which was 17,3% higher than continuously irrigation production about 6280 kg ha−1. Also, irrigation interval every four days can produce 6490 kg ha−1 of rice which was 12,3% higher than continuously irrigation production about 6280 kg ha−1. Varieties of Mekongga produce 6800 kg ha−1 of GKG which was 5% lower than Inpari 10 Laeya varieties, 4,1% lower than Inpari 1 varieties. Then, Inpari 1 produce 7080 kg ha−1 of GKG which was 0,89% lower than Inpari 10 Laeya. Irrigation interval every eight days capable to produce highest of GKG compared to others irrigation interval. It can be conclued that toposequence had significant different on rice production.