[KM] Soil moisture sensor networks for irrigation scheduling in Myanmar's central dry zone

[KM] Background

[KM] Farmers in Myanmar's central dry zone have traditionally relied on fixed calendar-based irrigation schedules, an approach that often leads to either water waste or under-irrigation given highly variable soil moisture conditions.

[KM] This article evaluates whether low-cost soil moisture sensors can improve irrigation efficiency without requiring farmers to adopt complex or costly monitoring equipment.

[KM] Methods

[KM] A field trial was conducted comparing crop plots irrigated on a fixed calendar schedule against plots irrigated based on readings from low-cost soil moisture sensors installed at representative depths.

[KM] Water use and yield outcomes were recorded across two growing seasons to compare the two irrigation approaches under similar soil and crop conditions.

[KM] Key findings

[KM] Sensor-guided irrigation reduced total water use meaningfully compared with fixed calendar scheduling, while yields in sensor-guided plots remained statistically comparable to calendar-irrigated plots.

[KM] The greatest water savings occurred during periods of unexpected rainfall, when calendar-based schedules continued irrigation regardless of actual soil moisture conditions.

[KM] Policy recommendations

[KM] The article recommends piloting subsidised distribution of low-cost soil moisture sensors among farmer groups in water-stressed dry zone areas, given the observed water savings at minimal added cost.

[KM] It also recommends pairing sensor distribution with basic training on interpreting readings, since farmer understanding of sensor data was found to influence how consistently the technology was used.