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杂交稻田有杂草３ ～４ 种，杂草覆盖度为１ ．６ ％ ，分别比粳稻田低６６ ％ 和９５ ％ 。杂交稻 汕优６３对鸭舌草、矮慈姑 和 水竹 叶的 控 制效 果 平均 为 ８９ ％ 。在 无 芒稗 ５０ 株／ ｍ ２ 干 扰 下， 杂交 稻 平 均减 产３ ．８ ％ ，而粳稻平均减产３４ ．７ ％ 。
Hybrid rice fields have weeds 3 to 4 kinds of weeds coverage of 1. 6% lower than japonica rice fields by 66% and 95% respectively. The control effect of hybrid rice Shanyou 63 on Monochamus alternatus, dwarf arrowhead and water bamboo leaves averaged 89%. Under the interference of 50 plants per square meter of barnyardgrass, the average yield of hybrid rice was reduced by 3. 8%, while the average yield of japonica rice 34. 7%.