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在水稻生育的中后期,植株周围土表逐渐形成一层根体较小,水平伸展,形如网状的表根。表根分布在4—5厘米土层中,只占全部根系的六分之一左右;而其干重达最大值的青熟期约占全部根干重的45.4—60.3％,完熟期占43.8—49.1％。表根活力在齐穗期要比下层根高36.9—87.6％,完熟期高77.5—121.0％。齐穗期和齐穗后6天、12天对桂朝2号剪除表根,其主茎青叶拈死增加率分别为9.0％、9.7％、17.3％,结实率下降
In the middle and later stages of rice growth, soil around the plant gradually formed a layer of root smaller, horizontal stretching, shaped like a mesh root. The root distribution is 4-5 cm soil layer, accounting for only about one sixth of the total root system; while the dry matter reaches the maximum value of green mature period accounted for 45.4-60.3% of all root dry weight, ripening period accounted for 43.8 -49.1%. The root vitality in heading stage was 36.9-87.6% higher than that in lower layer and 77.5-121.0% in mature stage. At heading stage and 6 days and 12 days after heading, the root of cuttings of Guizhao No.2 was cut off, and the increase rates of dead leaves were 9.0%, 9.7% and 17.3% respectively, and the seed setting rate decreased