Alternate drying - wetting can in crease root dry weight ratio of root shoot and root number.

干湿交替能够增加根冠比、根干重和根条数.

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The root - shoot ratio of rice varieties ranges from 0.05 to 0.3 at heading, averaging about 0.1 under drought condition.

干旱条件下,各水稻品种的根冠比在穗期介于0.05~.3之间, 平均为0.1.

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