Abstract: The impacts of ten herbicides on the plant height, tiller number and shrunkgrain panicle formation of a japonica rice variety Wuyujing 3 were studied in a pot experiment. In the soil treatment experiment, the plant height of rice was remarkably inhibited, but the tiller number of rice was not significantly influenced by acetochlor at the doses of 225 and 337.5 g/hm2 or by acetochlor (225 g/hm2) + bensulfuronmethyl (22.5 g/hm2) at 10 and 20 days after treatment. There were no significant differences in plant height and tiller number of rice between herbicide for soil treatment and the water control at 40 days after treatment. The plant height of rice was significantly inhibited at 10 and 20 days after treatment with chlorsulfuron (0.375, 0.75 and 1.5 g/hm2) and at 40 days after treatment with metsulfuronmethyl (0.75 and 1.5 g/hm2). The tiller number was not significantly influenced by chlorsulfuron or metsulfuronmethyl at 40 days after treatment. Foliar treatment of herbicides had no significant influence on the plant height and tiller number of rice. Additionally, the shrunkgrain panicle with typical symptom was not observed. Consequently, it was suggested that the herbicide was not a direct factor causing shrunkgrain panicle in Wuyujing 3.

Key words: herbicide, rice, shrunkgrain panicle, agronomic trait

摘要： 采用盆栽试验研究了10种除草剂对水稻生长及对“小粒穗”形成的影响。 在土壤处理中，用药处理后10、20 d，乙草胺225、337.5 g/hm2处理和乙草胺225 g/hm2+苄嘧磺隆22.5 g/hm2混用处理显著地 (P=0.05)抑制水稻株高，但并不影响分蘖发生，到用药后40 d，土壤处理药剂处理的水稻株高与对照无显著差异；在处理后10、20 d， 氯磺隆0.375、0.75、1.5 g/hm2处理可显著(P=0.05)影响水稻株高，而甲磺隆0.75、1.5 g/hm2处理在用药后30、40 d仍显著影响水稻株高，氯磺隆1.5 g/hm2和甲磺隆0.75、1.5 g/hm2在药后10、20 d也显著地影响水稻茎蘖数，但在药后40 d两药剂处理与对照均无显著差异。茎叶处理中，药剂处理对水稻株高、分蘖产生无显著的抑制作用。同时， 除草剂处理基本上不对水稻结实性产生影响，并未发现典型的“小粒穗”，表明稻田使用除草剂不是引起水稻“小粒穗”的直接原因。

关键词: 除草剂, 水稻, 小粒穗, 农艺性状