《Table 4 LPI values for three surveyed provinces》

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《Inter-provincial Differences in Rice Multi-cropping Changes in Main Double-cropping Rice Area in China: Evidence from Provinces and Households》

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Notes:the average paddy field area and number of agricultural laborers in each province is for reference.Labor required in each process of DCR-cropping during the busy season is not shown here because households varied significantly.The LPI values were ca

As discussed before，differences between these three groups include physical conditions，economic development，and demographics；however，we found the most significant difference between them was latitude.Due to differences in latitude，the groups have different incident radiation and thermal regimes；there was a strong relationship between rice cropping system and thermal regime.The active accumulated temperature（≥10℃accumulated temperature）required for rice growth plays a pivotal role in determining the appropriateness of rice double-cropping in a single year on the same plot.The mechanism for accumulated temperature leading to variation in rice multi-cropping needs to be evaluated.To characterize this mechanism，we identified a correspondence（Zou，2011）between thermal zones and duration of average daily temperatures>10℃.We found that provinces with higher active accumulated temperature had more time for DCR planting（Table 1）.