JStories ー In southern Japan, researchers from the Prefectural College of Kumamoto and the Nationwide Institute of Know-how, Kumamoto Faculty, have developed a compact spherical robotic designed to work in areas of rice paddies that standard equipment can’t attain. The prototype – nicknamed “Ball Duck”– is a part of an effort to create easy, low-cost instruments that ease a few of the most labor-intensive duties in rice cultivation and assist farmers preserve landscapes more and more liable to abandonment.
On the foot of Mount Aso, an lively volcano in Kumamoto Prefecture ー a spot identified for its picturesque terraced paddies ー the newest model of the robotic rolls by way of waterlogged fields, clawing up clusters of weeds embedded within the mud. This was the scene in Might, when the analysis consortium carried out a area check aimed toward easing considered one of rice farmers’ heaviest burdens.
Depopulation, an getting older workforce, and a shrinking pipeline of successors are putting intense stress on rice growers. Weeding ー typically achieved in sweltering summer time warmth ー stays backbreaking work, prompting extra farmers to surrender cultivation altogether. Terraced paddies, carved into steep slopes and damaged into small, irregular plots, are particularly difficult: They’re mentioned to require twice the labor for half the yield in contrast with flatland fields, driving a critical abandonment drawback.
Weeds similar to barnyard grass can considerably cut back rice development and yields. But for small terraces, utilizing medium or massive weeding machines is harmful, if not unimaginable. A light-weight, autonomous robotic that may take away weeds with out human labor couldn’t solely cut back bodily pressure and enhance security but in addition assist maintain rice cultivation in these fragile landscapes.
Transportable, low-cost, and designed for small paddies
Present weeding strategies vary from hand labor and mechanical instruments to the normal Japanese “aigamo” technique, wherein farmers increase hybrid geese that eat younger weeds and bugs whereas stirring up nutrient-rich mud. Extra lately, robots that churn mud to cloud the water and suppress weed development have begun to look.
The brand new spherical robotic beneath growth in Kumamoto takes a distinct strategy: It uproots weeds. Mild, cheap, and straightforward to make use of, it’s suited to the small, irregular parcels typical of terraced paddies. The system measures roughly 26 centimeters in diameter, weighs about 4 kilograms, and is anticipated to be priced round 10,000 yen per unit. Geared up with wi-fi charging, it runs for about six hours after a three-hour cost.
Contained in the sphere, inside wheels generate propulsion. Its weeding energy comes from the spherical nodules that stud the outer shell ー designed to evoke the form of the Aso caldera, considered one of Japan’s largest volcanic basins.
These protrusions churn mud and pull out weeds, and will be personalized by weed species or soil sort. In August, the consortium secured a patent protecting the shell’s construction, supplies, and weeding mechanisms.
A water depth of about 10 cm is required for efficient operation, usually beginning about one week after rice planting. Because it rolls, the robotic scrapes mud and dredges up weeds similar to barnyard grass and monochoria. In response to professor Naotaka Matsuzoe, who leads the undertaking, “The robotic’s motion has no adversarial impact on rice development or yields.”
Strides towards robots that may navigate terrace steps
As a result of the robotic is autonomous, it may be left within the area with out human supervision. Along with supporting natural rice cultivation by decreasing chemical herbicide use, it’s far cheaper than deploying massive equipment ー easing the financial burden on farmers.
“Japan has set a purpose of accelerating natural farming acreage to 25% (1 million hectares) by 2050,” Matsuzoe notes. “Meaning bodily strategies that cut back pesticide use are being reevaluated. Farmers want to grasp the precise situations of their paddies: when weeds seem, the place, and what varieties.”
“We’re nonetheless within the verification stage,” Matsuzoe provides. “Through the use of a robotic management system with short-range wi-fi beacons, we hope to enhance autonomous movement inside an invisible boundary and intention for real-world deployment in three to 5 years. In the end, we would like a robotic that may comply with water movement and independently cross the tiered steps of terraced paddies.”
The consortium can also be creating a chestnut-harvesting and transport robotic as a part of its push towards good agriculture. Throughout trials in August, the system decreased labor throughout harvest by 65%. After additional enhancements, a operated by hand model with electrical help is deliberate for launch in August 2026.
Robust curiosity at Osaka-Kansai Expo ー and potential in Southeast Asia
When the spherical weeding robotic was exhibited on the Osaka-Kansai Expo in June 2025, it drew vital public curiosity. “The battle to keep up terraced paddies isn’t distinctive to Japan,” says Matsuzoe. “Many Southeast Asian nations domesticate rice in related terrain, and a few areas stay untouched. I hope Japan can share its superior agricultural applied sciences with its neighbors.”
“Defending agriculture in mountainous and hilly areas ー not simply rising rice ー helps groundwater conservation and sustains numerous aquatic ecosystems. With local weather change bringing heavier rains and extra frequent flooding, flatland farmland alone received’t safe our meals provide. To make sure long-term meals stability, we should urgently construct sustainable agriculture that preserves terraced paddies in these areas.”
Translated by Anita De Michele | JStories
High picture: Photograph courtesy of the Prefectural College of Kumamoto
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