CSISA project suggests pathways to remove barriers inhibiting full use of groundwater irrigation infrastructure.
Inconsistent rainfall has repeatedly damaged paddy crops in Nepal over the last years, even though most agricultural lands are equipped with groundwater wells, contributing to missed national policy targets of food self-sufficiency and slow growth in cereal productivity. In a recently published article, Cereal Systems Initiative for South Asia (CSISA) researchers explore the drivers of smallholder farmers’ underuse of groundwater wells to combat in-season drought during the monsoon rice season in Nepal’s breadbasket — the Terai.
The study finds that several barriers inhibit full use of the groundwater irrigation infrastructure and proposes support pathways based on existing technologies.
A key issue is farmers’ tendency to schedule irrigation very late in an effort to save the crops when in-season drought occurs. By this time, rice crops have already been damaged by lack of water and yields will be decreased. High irrigation costs, especially when pumping equipment is rented at monopolistic rental rates, are a major factor of this investment aversion. In addition, private irrigation is a relatively new technology for many farmers making productive water use decisions.
After deciding to irrigate, queuing for pumpsets, tubewells, and repairs and maintenance further increase irrigation delays. Some villages have only a handful of pumpsets or tubewells shared between all households, so it can take up to two weeks for everybody to irrigate.
CSISA provides three suggestions for three spatially nested support pathways to address these issues and support farmers in combatting monsoon season drought.
- Raising awareness on the importance of timely irrigation
To avoid yield penalties and improve operational efficiency through better matched pumpsets, CSISA has raised awareness through agricultural FM radio broadcasts on the strong relationship between water stress and yield penalties. Messages highlight the function of the plough pan to keep infiltration rates low and encourage farmers to improve irrigation scheduling. Anecdotal evidence suggests that improved pump selection may decrease irrigation cost by up to 50%, and CSISA has initiated follow-up studies to develop recommendations for farmers.
In addition, timely irrigation often requires social interaction in purchasing fuel, transporting and installing pumps or shared use of irrigation equipment. These activities pose risks of COVID-19 exposure and transmission and therefore require farmers to follow safety and hygiene practices, which may cause further delays to irrigation. Raising awareness about the importance of timely irrigation therefore needs to go hand in hand with safe and hygienic irrigation practices. This information has been streamlined into the CSISA ongoing partnerships and FM broadcasts
2. Improving community-level water markets through increased focus on drought preparedness and overcoming liquidity constraints
Farmers can save time by taking an anticipatory approach to terms and conditions of rentals, instead of negotiating them when cracks in the soil are already large. Many pump renters also reported that pump owners are reluctant to rent out pumpsets if renters cannot pay up front. Given the seasonality of cash flows in agricultural, pro-poor and low interest credit provisions are likely to further smoothen community-level water markets.
3. Regional investment prioritization
Selectively targeting support and promotion programs in areas experiencing delays in access to pumpsets and groundwater wells can help farmers in combating monsoon season droughts.
Furthermore, the study shows that these delay factors differ across districts and that selectively targeted interventions will be most useful to provide high returns to investments. For example, farmers in Kailali reported that land access issues due to use of large bullock carts to transport pumpsets and fuel shortages constitute a barrier for 10% and 39% of the farmers, while in Rupandehi maintenance and tubewell availability were reported to be of greater importance.
As drought is increasingly threatening paddy production in Nepal’s Terai region, CSISA’s research shows that several support pathways exist to support farmers in combatting droughts. Sustainable water use can only be brought up to a scale where it benefits most farmers if all available tools including electrification, solar pumps and improved water level monitoring are deployed to provide benefits to a wide range of farmers.
Read the full article in Water International:
Anton Urfels, Andrew J. McDonald, Timothy J. Krupnik & Pieter R. van Oel (2020) Drivers of groundwater utilization in water-limited rice production systems in Nepal, Water International, 45:1, 39-59, DOI: https://doi.org/10.1080/02508060.2019.1708172