Difference in Cd accumulation among varieties with different growth duration corresponding to typical agro-climate condition in rice ratooning system.

Differences in daily average Cd accumulation rate of ratoon rice varieties with different growth duration As shown in Table 8 , in the main crop, the daily average Cd accumulation rate in various organs among varieties with different growth duration during the transplanting to full-heading stage showed a trend of late-maturity > mid-maturity > early-maturity varieties, and the differences were significant.

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In the main crop, as the growth stage progressed, the Cd concentration in the root of each variety first increased and then decreased, while the Cd concentration in the stem, leaf and grains spikelet showed an increasing trend.

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In the ratoon crop, as the growth stage progressed, the Cd concentration in the root and stubble of each variety showed a decreasing trend, while the Cd concentration in the stem, leaf and grains spikelet showed an increasing trend.

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