《Table 1 Comparative advantage indexes of major crops in Northeast China in 2004-2014》

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《Suitability Analysis of Scale Management in Northeast China Based on Efficiency Evaluation》

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Based on the calculation results of the comprehensive advantages of three major crops of maize，rice and soybean，the major crops in the Northeast China are generally not efficient，and the index is generally declining.The efficiency comparative advantage index of maize and rice is close to 1.0，and that of soybean has fallen below1.0.The maize and soybean in Northeast China have scale advantage and comprehensive advantage compared with the whole country，but these advantages show a downward trend.Although rice does not have scale advantage and comprehensive advantage，the index is on the rise.To a certain extent，it indicates that the reason why the comprehensive advantage of grain production in Northeast China is higher than the national average is the pull of production scale.Land and water resources to population ratios have contributed to the preconditions for regional scale production.