A couple days ago, our cousin and host, Kasey, invited us to a Rotary Club meeting of the Ubud, Bali, chapter. The featured speaker, J. Stephen Lansing, professor of anthropology at the University of Arizona, is an authority on evolutionary biology and specifically on the rice terrace irrigation systems of Bali, called Subak. For over a thousand years, the cycle of rice growing has been managed through water temples, organized by watershed districts. The irrigation system begins at the fresh springs and crater lakes of Mts. Batur and Batukaru, and courses through rivers, irrigation ditches, and tunnels, picking up the phosphates of the volcanic rock for natural fertilization. Rain contributes along the way. The growing season is about four months, and harvest is followed by flooding and pest control. So there are two harvests per year. It comes down to this mantra: the water flows, the rice grows, the pests move.

It’s an intricate system and we are sitting right in the middle of it here on the northern edge of Ubud. The fields to the east are harvested, but not yet plowed under. The fields behind us are already plowed, and are being flooded by the Subak. Meanwhile, a flock of ducks is hired to work in tandem with the plowman, to eat up pests. (I’m told the lead duck has a bell and a duck guy herds them into a pen each night. Are they clipped? I haven’t seen them in flight.)

Mr. Lansing is working on the 5th or 6th proposal to UNESCO to name the Bali rice terraces as a World Heritage Landscape. Apart from general recognition, the upside of this designation for farmers would be bridge financing to allow a return to organic growing practices, disrupted since the ‘70s. Back then, to encourage production, farmers were given grow kits, including phosphates, and the cooperative cycle of water use and rice planting seasons was interrupted. With the disruption, pests gained ground and production fell, not to mention that excess phosphates flowed out to sea and choked sections of coral reef.
Upstream rice growers are concerned more with pests over water, and the farmers downstream are worried more about water than pests. Acting alone, that would mean the upstream growers would retain more water to control pests, and downstream pests would flourish due to lack of water – eventually moving back up for more rice to eat. But as everyone fears what they can least control, the temple system steps in. Representatives from each district meet at the temple at the head of the watershed and, likewise, representatives from each terrace area meet with their river partners. Holy water from the source, blessed in the traditional ceremonies, is passed along, added to each terrace area, thus establishing the intricate timing for planting, harvesting, pest control, and flooding.

Researchers have applied game theory to this system, using both simple two-player and multiple-player prototypes. The self-organization of the temple system yields the highest production.

Other factors are critical to the successful return to century-old practices of water management. New hotels and golf courses require water beyond current supplies. Development is impinging on some rice terrace areas. Laborers are in increasingly short supply as they move to the more lucrative hospitality industry and to the fast-growing coastal areas. But it seems self-evident that the delicate water temple system is to be honored and protected, and that Bali’s landowners ought to be rewarded for maintaining their unique rice terraces.