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对旱作条件下水陆稻灌浆期根系生长特性作了比较研究，结果表明：（１）灌浆期根系的垂直分布不同，水稻的根系一般分布在０～４０ｃｍ土层，陆稻根系一般分布在０～６０ｃｍ土层，最深可达８０ｃｍ，且水稻总根系分布较浅（０～３０ｃｍ间占总量的８７．０２％～９６．６７％），陆稻总根系分布较深（０～３０ｃｍ间只占总量的６１．４２％～８１．７０％）。因此，陆稻具有深扎根性。（２）除比根长参数外，不论是同一垂直位置，还是整个根系，陆稻的各根参数值远远大于水稻，甚至达３．２１倍。（３）旱作条件下，陆稻的比根长小于水稻，即陆稻的根直径略大于水稻，这可能是生态适应性的缘故。（４）陆稻的耐旱性强于水稻。
The results showed that: (1) The vertical distribution of roots in filling stage was different. The root system of rice was generally distributed in 0 ~ 40cm soil layer. The root system of Upland rice was generally distributed in 0 ~ 60cm soil layer, the deepest was 80cm, and the total root distribution of rice was shallow (87.02% ~ 96.67% of the total in 0 ~ 30cm), and the root system of Upland rice was deep (0 ~ 30cm Accounting for 61.42% ~ 81.70% of the total). Therefore, Upland rice has deep roots. (2) In addition to the specific root length parameters, the root parameters of Upland rice are much larger than rice, even up to 3.21 times, regardless of the same vertical position or the whole root system. (3) Under drought conditions, the specific root length of upland rice is smaller than that of rice, that is, the root diameter of upland rice is slightly larger than that of rice, which may be the reason of ecological adaptability. (4) Upland rice is more drought-tolerant than rice.