Effects of the application of herbicides mixed with safeners on weeds control efficacy and the safety to proso millet
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摘要: 为探讨除草剂与安全剂混用对杂草的防治效果及对糜子安全性的影响,以‘榆糜2号’为试验材料,在糜子三叶期选取两种茎叶型除草剂——阔世玛 (3.6% 二磺 • 甲碘隆水分散粒剂)和锐超麦 (20% 双氟 • 氟氯酯可湿性粉剂)与两种安全剂——芸苔素内酯(brassinolide, BR )和赤霉素(gibbrellic acid, GA)进行混合喷施,同时设置人工除草对照 (CK1)和清水对照 (CK2),测定药害指数、杂草防效、糜子叶片叶绿素相对含量、叶片活性氧代谢、地上生物量与产量的变化。结果表明:BR可完全消除低剂量阔世玛的药害,使高剂量阔世玛的平均药害指数显著下降58.2%;GA可完全消除低剂量锐超麦的药害,使高剂量锐超麦的平均药害指数显著下降81.7%;添加安全剂后药剂的杂草防效降低1.7%~18.0%,但总体防效较好。除草剂与安全剂混用,在一定程度上提高了糜子叶片超氧化物歧化酶 (SOD)活性和叶绿素含量,显著降低了丙二醛 (MDA)含量;与单施除草剂相比,低剂量阔世玛、高剂量阔世玛与BR混合喷施后,糜子叶片SOD活性分别在抽穗后7 d及28 d内明显上升;锐超麦与BR或GA混合喷施后,糜子叶片SOD活性在抽穗后7 d内显著升高。与单施除草剂相比,阔世玛与BR或GA混合喷施,在糜子抽穗后21~28 d时地上生物量显著增加;低剂量锐超麦与BR混用在抽穗后14 d内以及高剂量锐超麦与GA混用在抽穗后28 d内,地上生物量显著增加。除草剂与安全剂混合喷施后显著增加了糜子产量,其中,600 g/hm2 的阔世玛与0.015 g/hm2 的BR混用、100 g/hm2 的锐超麦与14.7 g/hm2 的GA混用的产量最高,分别较CK2增加了26.1%和27.9%,比单施除草剂的分别增产了4.6%和11.6%。研究结果可为糜子田除草剂的安全应用及利用植物生长调节剂缓解除草剂药害提供科学依据。
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关键词:
- 糜子 /
- 阔世玛(3.6% 二磺 • 甲碘隆水分散粒剂) /
- 锐超麦(20% 双氟 • 氟氯酯可湿性粉剂) /
- 芸苔素内酯 /
- 赤霉素 /
- 杂草防效 /
- 药害缓解
Abstract: To evaluate the effect of herbicides mixed with safeners on weeds control efficacy and the safety to proso millet (Panicum miliaceum L.) at high- and low- dosages of herbicides, Sigma broad (mesosulfuron-methyl + iodosulfuron-methyl-sodium 3.6% WG) and Quelex (halauxifen-methyl + florasulam 20% WP), were mixed with safeners, brassinolide (BR) or gibberellic acid (GA), and sprayed on the leaves and stems of ‘Yumi-2’ cultivar at three-leaf stage. Meanwhile, artificial weeding (control check 1, CK1) and tap water (control check 2, CK2) were included. The phytotoxicity index, control efficacy of weed, relative chlorophyll content, and active oxygen metabolism in leaves, shoot biomass, and seed yields were measured. The results showed that: BR eliminated the phytotoxicity of Sigma broad herbicide at low dosage, and 11.5% reduction of phytotoxicity index at high dosage; GA eliminated the phytotoxicity of low-dose Quelex herbicide and 40.9% reduction of phytotoxicity index of high-dose Quelex herbicide. However, the control effect of weed decreased 1.7%-18.0% in the treatments of herbicides and safener combinations. Application of herbicide plus safener increased the activity of superoxide dismutase (SOD) and chlorophyll content to some extent and decreased the content of malondialdehyde (MDA) significantly in proso millet leaves. Compared with the single application of herbicide, the SOD activity in the leaves of proso millet increased in the treatments of low- and high-dose Sigma broad herbicide mixed with BR at 7 d and 28 d after heading stage, and in the treatments of Quelex herbicide mixed with BR or GA at 7d after heading stage. Compared with the single application of herbicide, the shoot biomass of proso millet increased significantly in the treatments of Sigma broad herbicide mixed with BR or GA at 21-28 d after heading stage, and low-dose Quelex mixed with BR at 14 d after heading stage, and high-dose Quelex mixed with GA at 28 d after heading stage. The treatments with the mixture of herbicides and safener increased the seed yield of proso millet. The maximum yield was gained in the treatments of 600 g/hm2 Sigma broad herbicide mixed with 0.015 g/hm2 BR and 100 g/hm2 Quelex herbicide mixed with 14.7 g/hm2 GA, with 26.1% and 27.9% higher than the control of CK2, and 4.6% and 11.6% higher than the herbicide application only, respectively. The results could provide a scientific basis for the safety application of herbicides in broomcorn millet field and the use of plant growth regulators to alleviate herbicide phytotoxicity. -
表 1 试验处理
Table 1. Experimental treatments
处理编号
Traetment code药剂
Agent有效成分用量
Dosage of effective
component, a.i/(g/hm2 )T1 阔世玛 Sigma broad 450 T2 阔世玛 + 芸苔素内酯
Sigma broad +BR450 + 0.015 T3 阔世玛 + 赤霉素
Sigma broad + GA450 + 14.7 T4 阔世玛 Sigma broad 600 T5 阔世玛 + 芸苔素内酯
Sigma broad + BR600 + 0.015 T6 阔世玛 + 赤霉素
Sigma broad + GA600 + 14.7 T7 锐超麦 Quelex 86 T8 锐超麦 + 芸苔素内酯
Quelex + BR86 + 0.015 T9 锐超麦 + 赤霉素
Quelex + GA86 + 14.7 T10 锐超麦 Quelex 100 T11 锐超麦 + 芸苔素内酯
Quelex + BR100 + 0.015 T12 锐超麦 + 赤霉素
Quelex + GA100 + 14.7 CK1 — — CK2 — — 注 (Note): BR = brassinolide; GA = gibbrellic acid. 表 2 除草剂与安全剂混用对杂草鲜重防效及药害指数的影响
Table 2. Effect of herbicides mixed with safeners on weeds’ fresh weight control efficacy and phytotoxicity index of herbicides
处理
Treatment杂草鲜重防效
Weeds’ fresh weight control efficacy/%平均药害指数
Average phytotoxicity index14 d 21 d 28 d 35 d 42 d T1 73.1 ± 10.1 b 66.5 ± 9.3 c 72.4 ± 21.6 ab 65.7 ± 7.2 b 60.4 ± 4.3 b 14.63 ± 2.30 f T2 66.4 ± 25.1 c 69.1 ± 11.2 c 61.5 ± 2.7 b 54.4 ± 9.4 c 42.9 ± 17.5 d — T3 75.9 ± 17.3 b 69.5 ± 8.9 c 71.3 ± 16.2 b 68.7 ± 8.1 b 60.2 ± 15.6 b 11.18 ± 2.85 g T4 87.1 ± 5.0 a 82.3 ± 14.5 a 79.5 ± 5.6 a 86.6 ± 2.4 a 86.0 ± 8.6 a 19.79 ± 4.23 e T5 79.2 ± 2.7 b 80.1 ± 3.2 a 75.5 ± 9.4 ab 69.1 ± 7.1 b 54.8 ± 9.8 c 8.27 ± 1.26 h T6 74.7 ± 9.3 b 70.3 ± 7.3 b 69.7 ± 10.2 b 64.5 ± 4.6 b 52.1 ± 21.7 c 31.37 ± 4.69 c T7 82.7 ± 3.5 a 82.2 ± 6.9 b 84.6 ± 2.3 a 84.8 ± 0.8 a 80.5 ± 4.6 a 33.85 ± 4.51 b T8 80.2 ± 7.9 a 81.6 ± 9.4 b 79.4 ± 9.6 b 78.5 ± 2.9 b 74.2 ± 0.5 b 17.81 ± 3.04 e T9 84.3 ± 10.5 a 85.5 ± 12.5 a 79.8 ± 7.0 b 76.7 ± 13.4 b 80.0 ± 2.7 a — T10 88.3 ± 5.4 a 87.6 ± 11.0 a 84.3 ± 6.1 a 84.5 ± 3.5 a 83.1 ± 10.0 a 50.01 ± 6.20 a T11 80.4 ± 17.8 a 80.2 ± 8.7 b 72.1 ± 2.3 b 78.3 ± 12.6 b 74.6 ± 2.9 b 26.43 ± 5.24 d T12 79.6 ± 3.2 b 80.1 ± 10.9 b 77.8 ± 9.3 b 81.2 ± 25.1 a 76.5 ± 1.3 b 9.13 ± 0.91 gh 注:同列不同字母表示不同处理间差异显著 (P < 0.05)。Note: Different letters in the same column values indicate significant difference at P < 0.05 level by Duncan’s multiple range test. 表 3 除草剂与安全剂混用对糜子叶片叶绿素含量的影响
Table 3. Effect of herbicides mixed with safeners on the chlorophyll content of proso millet leaves
处理
Treatment叶绿素含量
Chlorophyll content/%0 d 7 d 14 d 21 d 28 d CK1 37.2 ± 2.9 a 39.5 ± 4.7 a 41.3 ± 2.3 a 42.4 ± 3.6 a 39.6 ± 0.7 a CK2 34.3 ± 0.4 b 37.2 ± 1.2 b 39.1 ± 1.7 b 38.7 ± 2.2 c 35.2 ± 4.0 b T1 34.1 ± 3.4 b 35.7 ± 3.7 c 39.1 ± 5.8 b 37.6 ± 1.1 c 37.0 ± 0.9 ab T2 36.8 ± 1.4a 38.7 ± 0.8 ab 40.5 ± 0.3 ab 41.5 ± 1.6 ab 39.2 ± 4.9 a T3 37.0 ± 3.6 a 40.1 ± 4.5 a 42.5 ± 2.7 a 41.6 ± 2.8 ab 37.3 ± 5.5 ab T4 36.8 ± 6.0 a 39.7 ± 3.8 a 40.6 ± 0.2 ab 39.0 ± 2.1 c 37.2 ± 1.5 ab T5 34.9 ± 3.1 b 37.1 ± 1.6 b 39.4 ± 3.6 b 38.5 ± 0.7 c 37.9 ± 1.0 ab T6 35.1 ± 6.3 b 38.0 ± 0.6 b 41.2 ± 3.9 a 40.1 ± 1.9 b 38.6 ± 4.3 ab T7 31.1 ± 2.7 c 34.2 ± 0.3 c 37.9 ± 5.4 bc 38.0 ± 4.1 c 36.3 ± 3.5 b T8 34.8 ± 4.3 b 39.1 ± 4.1 a 42.6 ± 5.1 a 43.7 ± 5.6 a 40.2 ± 3.3 a T9 34.6 ± 1.9 b 38.7 ± 2.2 a 41.5 ± 1.3 a 44.0 ± 3.2 a 39.6 ± 2.4 a T10 29.2 ± 1.1 d 31.5 ± 2.5 d 36.0 ± 2.8 c 36.9 ± 4.9 d 28.8 ± 2.0 d T11 32.7 ± 1.8 c 35.7 ± 3.2 c 39.8 ± 4.7 a 40.1 ± 6.0 b 37.6 ± 1.2 b T12 33.5 ± 2.6 c 34.4 ± 0.5 c 38.2 ± 4.2 b 39.9 ± 3.9 b 34.3 ± 5.3 c 注:同列不同字母表示不同处理间差异显著 (P < 0.05)。Note: Different letters in the same column mean significant difference at P < 0.05 level. 表 4 除草剂与安全剂混用对糜子产量的影响
Table 4. Effect of herbicides mixed with safeners on the yield of proso millet
处理
Treatment千粒重
1000−seed mass/
g产量
Grain yield/
(kg/hm2)与对照相比
Compared with controlWith CK1 With CK2 CK1 9.23 ± 0.0 a 2937.0 ± 80.1 a — — CK2 9.72 ± 0.4 a 2164.0 ± 14.6 d — — T1 9.35 ± 0.3 a 2556.0 ± 21.3 c −13.0 18.1 T2 9.11 ± 0.2 a 2584.0 ± 55.9 c −12.0 19.4 T3 9.81 ± 0.2 a 2683.0 ± 39.1 bc −8.6 24.0 T4 9.39 ± 0.1 a 2586.0 ± 40.8 c −11.9 19.5 T5 9.61 ± 0.5 a 2706.0 ±22.7 b −7.9 26.1 T6 9.37 ± 0.1 a 2666.0 ± 99.1b c −9.2 23.2 T7 9.64 ± 0.2 a 2494.0 ± 33.3 c −15.1 16.2 T8 9.47 ± 0.1a 2701.0 ± 76.7 b −8.0 24.8 T9 9.43 ± 0.4 a 2714.0 ± 20.2 b −7.6 25.4 T10 9.60 ± 0.5 a 2480.0 ± 54.1 c −15.6 14.6 T11 9.29 ± 0.1 a 2583.0 ± 12.6 c −12.1 19.4 T12 9.35 ± 0.2 a 2768.0 ± 27.3 b −5.8 27.9 注:同列不同字母表示不同处理间差异显著 (P < 0.05) 。Note: Different letters in the same column meant significant difference at P < 0.05 level. -
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