Groundwater levels are falling across 90% of the state, with the decline accelerating since the 1980s. Central Punjab is most severely affected. In the context of climate change, the timing of the rainy season is increasingly unpredictable. With no solid climate information to guide them, and with state policies encouraging energy- and water-intensive agriculture, farmers are rapidly depleting underground aquifers.
Since 2008, Punjab Agricultural University (PAU) and Columbia University have worked together with farmers to address these unsustainable practices, while maintaining yields and livelihoods. The latest phase of research — launched in 2012 with funding from Canada’s International Development Research Centre — links low-income farmers, corporations, the state development bank, and the state agricultural extension program in testing innovations that will reduce pressure on overused aquifers. This initiative is helping farmers use meteorological information to plan their water and energy use, while exploring how policy reforms and agricultural value chains might shift production toward more sustainable practices.
Sensors tell farmers when to irrigate, seed their crops
A key innovation tested in earlier research is the use of low-cost, locally produced soil moisture sensors that let farmers know when to irrigate and seed. In trials, farmers testing sensors averaged water and energy savings of more than 20%. When farmers used the sowing method known as direct seeding of rice rather than transplanting, water savings were as much as 34%, with no decline in yields. Research is now scaling up to include more than 5,000 farmers in five districts of Punjab. They will use 9,000 sensors, with the government investing in a further 15,000 sensors statewide.
Policy reform is essential. Farmers have little incentive to change their practices when electricity is provided free to them, they receive a guaranteed price for water-intensive grain crops, and there is no regulation or pricing on groundwater. To explore market incentives that could move farmers away from thirsty crops such as rice, the team is working with industry to test how agricultural value chains can encourage crop diversity. Through cooperative agreements with farmers, the food corporation Field Fresh is contracting for supplies of fruits and vegetables, which consume less water than grains. The processing stages also provide work for local women.
Preparing for a megadrought
Research will conclude in late 2015, and the team is assessing the potential for a prolonged megadrought, and the role that changes in irrigation practices, crop diversification, and energy pricing could play in mitigating its impacts. Recommendations will be presented to policymakers and the state agricultural extension program. The evidence will help guide a much-needed transformation of water and energy use in Punjab.
This project brings together PAU, the Columbia Water Center, and the International Research Institute for Climate and Society of Columbia University. Other collaborating institutions are the Centers for International Projects Trust, Field Fresh Del Monte India, and the International Water Management Institute.
Mary O'Neill is an Ottawa-based writer.
Source: IDRC website