A Study on the Spatial-Temporal Evolution and Driving Factors of Non-Grain Production in China's Major Grain-Producing Provinces.

From 2011 to 2020, Heilongjiang and Jilin provinces ranked as the last two in terms of non-grain productivity: Heilongjiang’s average non-grain productivity was at 4.11%, with the highest non-grain production ratio at 6.68% in 2011 and the lowest non-grain productivity at 2.92% in 2019, showing a decreasing trend.

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In 2011, 2015, and 2020, the number of cities in the northeast region with a high proportion of total national grain production was on an increasing trend, while the number of cities in the middle and lower reaches of Yangtze River with a high proportion of total national grain production was in a diametrically opposite trend.

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