Abstract: In order to investigate the effect of 2,4-D butyl ester on safety in naked oat,‘Baiyan No. 2’ was used as material to study the residuals of low,medium and high concentrations (450,750 and 1 050 mL·hm^-2) 2,4-D butyl ester in naked oat and their effects on shell rate and plant height of oat. The results showed that the residue amount of 2,4-D butyl ester in naked oat increased with increasing the concentration of 2,4-D butyl ester. 2,4-d butyl ester sprayed after 7 days,the residue amount of 2,4-D butyl ester in naked oat under high dosage was 0.802 mg·kg^-1,147.53% higher (P<0.05) than low dosage. The residue amount of 2,4-D was positively correlated with the dosage of 2,4-D butyl ester. After 28 days,the residue amount of 2,4-D in naked oats was 0.032 mg·kg^-1 under high dosage and 0.026 mg·kg^-1 under medium,which was 3 to 4 times greater than that under the low dosage (P<0.05). 2,4-D butyl ester had significant effects on the safety of naked oat. 2,4-D butyl ester increased the shell rate of oat,reaching 5.61% under high dosage,and decreased the plant height,12.90% decrease compared to the control. Medium and high dosage caused damage of ‘Baiyan No.2’ and the high residue amount of 2,4-D butyl ester,and low dosage was safe.

Key words: Naked oat, 2,4-D butyl ester, 2,4-D, Residue, Hull rate

摘要： 为了探讨2，4-D丁酯对裸燕麦安全性的影响，以白燕2号为材料，研究了低、中和高浓度（450，750和1 050 mL·hm^-2）2，4-D丁酯在裸燕麦中的残留差异及其对燕麦带壳率、株高的影响。结果表明：随着施用浓度的升高，2，4-D丁酯的残留量也在增加。施药7 d后，高浓度下2，4-D丁酯在裸燕麦中的残留量为0.802 mg·kg^-1，比低浓度显著（P<0.05）高出147.53%，且2，4-D的残留量与2，4-D丁酯的用量呈正相关关系；28 d后高浓度下裸燕麦中2，4-D残留量最高，达0.032 mg·kg^-1，中浓度下为0.026 mg·kg^-1，比低浓度处理显著（P<0.05）高出3~4倍。2，4-D丁酯喷施后对裸燕麦的安全性影响也非常显著。2，4-D丁酯增加裸燕麦的带壳率，降低了株高，高浓度下带壳率达5.61%，显著（P<0.05）高于对照，株高较对照显著（P<0.05）降低了12.90%。中、高浓度下，白燕2号均表现出药害现象，2，4-D丁酯残留量较高，低浓度处理对裸燕麦安全。

关键词: 裸燕麦, 2, 4-D丁酯, 2, 4-D, 残留, 带壳率