What changed
A new Nature Food study proposes a different irrigation strategy for China’s maize, wheat and rice: make existing irrigated farmland more efficient, then use the saved water to irrigate selected rain-fed areas.
The research team combined 42,190 county-level agricultural records, 3,576 household surveys and 2,230 irrigation trials. Its investment mix would give maize more advanced technology and moderate area expansion, while wheat and rice would need less new irrigated land and could use medium-efficiency systems.
Why it matters
China’s irrigation transition is already under way. Between 2010 and 2022, inefficient methods such as earth canals and flood irrigation declined, while water-saving technologies became more common. But progress has varied sharply by crop and region.
At the current pace, irrigation water use per mu across the three crops would fall by only 9.4% to 16.0% by 2030. That remains well below the national target of 25.5%.
The study’s central insight is that saving water and producing more food do not have to be competing instructions. Upgrading every existing irrigated field could meet the water target, but it would not fully offset the crop losses that climate change may bring. Redirecting part of the saved water to carefully chosen rain-fed fields could protect production more effectively.
That is a planning proposal, not a guaranteed outcome. Its success would depend on available water, climate impacts, crop prices, farm scale and how quickly authorities can implement the investment mix. Irrigation would also need to work alongside resilient crop varieties, climate-adaptive farming and high-standard farmland construction.
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