Preparation of metolachlor + bensulfuron-methyl 20% effervescent tablets and its control efficacy on weeds in paddy field
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摘要: 为了提高稻田杂草化学防除的省力化程度,降低防治成本,通过单一变量法筛选配方中的助剂种类和用量,采用干法压片工艺制备了20%异丙甲 • 苄泡腾片剂 (有效成分异丙甲草胺 + 苄嘧磺隆),同时进行了田间药效评价。结果表明:20%异丙甲 • 苄泡腾片剂的优化配方(质量分数)为:16%异丙甲草胺,4%苄嘧磺隆,18%有机膨润土,9%白炭黑,20%酒石酸,20%碳酸氢钠,6%润湿剂EFW,4%分散剂G202和3%润滑剂硬脂酸镁。该泡腾片剂在有效成分120~180 g/hm2 的用量范围内能有效防除稻田杂草,防效明显优于其单剂,与已登记的20%异丙甲 • 苄(有效成分质量比17 : 3)可湿性粉剂相当,持效期达40 d以上。所研制的20%异丙甲 • 苄泡腾片剂表面光滑,无粉尘,使用方便,省时省工,对稻田常见杂草均有良好防效,持效期长,具有推广价值。Abstract: In order to improve the labor-saving degree of chemical control of weeds in rice fields and reduce the cost of weed control, metolachlor + bensulfuron-methyl 20% effervescent tablets were prepared by the dry pressing process. The type and dosage of adjuvants in the formulation were selected by the single variable method, and the field efficacy of the prepared effervescent tablets was evaluated. The results showed that the optimal formulation (mass fraction) of metolachlor + bensulfuron-methyl 20% effervescent tablets was: 16% metolachlor, 4% bensulfuron-methyl, 18% organobentonite, 9% white carbon black, 20% tartaric acid, 20% sodium bicarbonate, 6% EFW, 4% G202 and 3% magnesium stearate. The effervescent tablets could effectively control weeds in the rice field in the dosage range of 120-180 g/hm2 of active ingredients, and its control efficacy was significantly better than that of single agent, which was equivalent to that of the registered wettable powder. The duration of control efficacy was more than 40 days. The effervescent tablets prepared in the study had smooth surface, no dust, and remarkable control efficacy against weeds in the rice field, which was worth to be promoted as a convenient and time- and labor-saving pesticide formulation.
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Key words:
- metolachlor /
- bensulfuron-methyl /
- effervescent tablets /
- formula screening /
- paddy weed /
- control efficacy
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表 1 不同填料的物理性质
Table 1. Physical properties of different fillers
填料名称
Fillers name颗粒间孔隙率
Interparticle porosity,
Ie流动性 (吸附原油后)
Liquidity (After adsorption
of crude oil)休止角
Angle of
repose, α/(°)豪斯纳比
Hausner
ratio, IH白炭黑 White carbon black 2.9 16 1.09 高岭土 Kaolin clays 1.0 25 1.31 有机膨润土 Organobentonite 1.1 22 1.22 硅藻土 Kieselguhr 0.4 29 1.36 表 2 填料选择
Table 2. Filler selection
填料 (m(白炭黑) :
m(有机膨润土)=)
Fillers (m(silica) : m(organobentonite)=)崩解时间
Disintegration
time/s悬浮率
Suspensibility/
%硬度
Hardness/
(kg/mm2)13.5 : 13.5 410 87.4 4.5 18 : 9 402 86.3 3.2 9: 18 418 89.8 6.9 表 3 崩解剂选择
Table 3. Disintegrant selection
崩解剂
Disintegrant质量比
Mass ratio崩解时间
Disintegration time/sCO2 释放量
Carbon
dioxide release/g吸湿率
Moisture absorption
rate/%柠檬酸 : 碳酸钠
Citric acid : sodium carbonate22 : 18 688 0.144 5.1 21 : 19 650 0.141 5.0 20 : 20 733 0.132 5.3 19 : 21 750 0.136 5.1 18 : 22 834 0.118 4.7 柠檬酸 : 碳酸氢钠
Citric acid :
sodium bicarbonate22 : 18 998 0.082 5.1 21 : 19 912 0.111 5.0 20 : 20 860 0.129 5.3 19 : 21 823 0.150 4.7 18 : 22 821 0.142 4.9 酒石酸 : 碳酸钠
Tartaric acid :
sodium carbonate22 : 18 680 0.158 5.9 21 : 19 630 0.182 6.0 20 : 20 621 0.189 6.3 19 : 21 650 0.176 6.3 18 : 22 745 0.134 6.1 酒石酸 : 碳酸氢钠
Tartaric acid :
sodium bicarbonate22 : 18 521 0.161 5.3 21 : 19 478 0.188 5.8 20 : 20 407 0.202 5.9 19 : 21 445 0.192 5.8 18 : 22 500 0.168 5.6 表 4 润湿剂选择
Table 4. Wetting agent selection
润湿剂
Wetting agent质量分数
Mass fraction/%润湿时间
Wetting time/s790A 6 69 十二烷基硫酸钠
Sodium lauryl sulfate6 72 木质素磺酸钠
Sodium lignosulfonate6 69 烷基萘磺酸盐 (EFW)
Alkyl naphthalene sulfonate6 43 表 5 分散剂选择
Table 5. Dispersant selection
分散剂
Dispersant质量分数
Mass fraction/%悬浮率
Suspensibility/%十二烷基苯磺酸钠
Sodium dodecyl benzene sulfonate4 83 亚甲基双萘磺酸钠 NNO 4 81
羧酸盐分散剂 D1003
Carboxylate D10034 84 分散剂 202 Greensperse 202 (G202) 4 90 表 6 润滑剂选择
Table 6. Lubricant selection
润滑剂
Lubricant质量分数
Mass fraction/%光滑度
Smoothness是否黏冲
Whether stick to
the punch滑石粉
Talcum3 不光滑
Rough黏冲
Punch sticking聚乙二醇6000
PEG60003 不光滑
Rough不黏冲
No punch sticking硬脂酸镁
Magnesium stearate3 光滑
Smooth不黏冲
No punch sticking表 7 包装材料选择
Table 7. Packaging material selection
包装材料
Packaging materials稳定性
Stability水溶袋
Water soluble bag密闭性差,不崩解
Poor tightness, no disintegrationPE袋
PE bag密闭性差,不崩解
Poor tightness, no disintegration铝箔袋
Aluminum foil bag密闭性强,崩解
Strong tightness, disintegration表 8 热贮前后CO2释放量
Table 8. Release amount of CO2 before and after the thermal storage
序号
Serial number单片质量
Tablet mass/g贮前释放CO2质量
Mass of carbon dioxide before storage/g序号
Serial number单片质量
Tablet weight/g贮后释放CO2质量
Mass of carbon dioxide after storage/g1 0.77 0.193 1 0.79 0.194 2 0.79 0.196 2 0.78 0.196 3 0.81 0.202 3 0.82 0.201 4 0.80 0.198 4 0.81 0.200 5 0.80 0.194 5 0.80 0.193 表 9 20%异丙甲 • 苄泡腾片热贮稳定性
Table 9. Thermal storage stability of metolachlor + bensulfuron-methyl 20% effervescent tablets
检测项目
Test items热贮前
Before
thermal
storage热贮后
After
thermal
storage异丙甲草胺含量
The content of metolachlor/%16 15.4 苄嘧磺隆含量
The content of bensulfuron-methyl/%4 3.9 悬浮率
Suspensibility/%90 88 pH值
pH value6.9 6.7 崩解时间
Disintegration time/s418 532 是否胀袋
Whether swollen bag否
No否
No表 10 20%异丙甲 • 苄泡腾片剂对稻田杂草的株防效和鲜重防效
Table 10. The control efficacy of metolachlor + bensulfuron-methyl 20% effervescent tablets based on the weed number and fresh weight in rice fields
防治效果 Control efficacy/% 处理
Treatment稗草
Echinochloa crusgalli千金子
Leptochloa chinensis鳢肠
Eclipta prostrata莎草
Cyperus rotundus总草
Total grass药后 20 d 株防效
Control efficacy of plant number after 20 d1 93.15 a 83.24 b 95.79 a 91.09 a 91.42 a 2 96.04 a 89.21 a 97.47 a 92.38 a 94.05 a 3 34.95 c 25.90 c 86.39 b 89.41 a 60.81 c 4 87.64 b 82.43 b 83.45 b 83.84 b 84.32 b 5 94.13 a 82.39 b 95.62 a 91.76 a 91.77 a 药后 40 d 株防效
Control efficacy of plant number after 40 d1 85.76 a 81.06 a 88.52 a 88.31 a 86.03 a 2 87.62 a 81.36 a 93.35 a 91.06 a 88.90 a 3 28.63 c 23.29 b 87.19 a 88.11 a 58.39 c 4 79.18 b 80.71 a 79.74 b 85.12 b 81.82 b 5 86.06 a 82.31 a 89.69 a 87.07 ab 86.35 a 药后 40 d 鲜重防效
Control efficacy of fresh weight after 40 d1 91.77 a 88.62 a 88.86 b 90.03 a 90.05 a 2 94.97 a 90.78 a 94.57 a 92.37 a 93.19 a 3 24.51 c 18.31 b 88.84 b 89.27 a 39.95 b 4 86.93 b 88.49 a 81.06 c 86.95 b 86.45 a 5 92.26 a 88.65 a 90.26 ab 86.57 b 90.22 a 注:同列数值后含有不同字母表示邓肯新复极差检验法在P < 0.05水平上差异显著。处理1为20%异丙甲 • 苄泡腾片(有效成分120 g/hm2);处理2为20%异丙甲 • 苄泡腾片(有效成分180 g/hm2);处理3为10%苄嘧磺隆可湿性粉剂(有效成分120 g/hm2);处理4为960 g/L异丙甲草胺乳油(有效成分120 g/hm2);处理5为20%异丙甲 • 苄可湿性粉剂(有效成分120 g/hm2)。Note: Different letters in the same column mean significant differences at P < 0.05 according to a DMRT test. Treatment 1: metolachlor + bensulfuron-methyl 20% effervescent tablets (120 g a.i./hm2). Treatment 2: metolachlor + bensulfuron-methyl 20% effervescent tablets (180 g a.i./hm2). Treatment 3: bensulfuron-methyl 10% WP (120 g a.i./hm2). Treatment 4: metolachlor 960 g/L EC (120 g a.i./hm2). Treatment 5: metolachlor + bensulfuron-methyl 20% WP (120 g a.i./hm2). -
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