The higher the precipitation, the greater the root depth, total root length and root diameter, the more lateral roots and the lower ratio of root to shoot.

降雨量越大，根系越深、总根长越大、根系直径越大、侧根越多、根冠比越低。

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With the increasing of light intension, number, length and diameter of root and root-shoot ratio were all increased.

平均生根数、根长、根冠比和根粗均随光照强度的增强而增大。

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With the improvement of rice cultivars, root dry weight and the ratio of root to shoot were increased, but the amount of root bleeding sap was reduced.

随品种的演进，抽穗期根重以及根冠比提高，但根系伤流液量减少。

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