From 2000 to 2015, the sown areas of winter wheat, summer maize, and rice all showed a trend of increase in the south and decrease in the north.
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Changes in the Water-Energy Coupling Relationship in Grain Production: A Case Study of the North China Plain.
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The sentences
The results revealed that from 2000 to 2015, CI values for grain production in the NCP showed a decreasing trend, from 0.442 to 0.438, where the CI values of winter wheat, summer maize, and rice all decreased, and only that of spring maize increased.