Capital deepening and land average grain yield convergence: Evidence from China.

Although the maize yield per unit land in both provinces showed an increasing trend, he maize yield per unit land in Xinjiang increased more rapidly and caught up with that in Liaoning ( Fig. 2 ).

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With the exception that the proportion of grain sown area has a consistent positive impact and partially significant in the three japonica rice regression models, in the other crop models it is either negative and not significant, or the direction of coefficient symbols is inconsistent.

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