Evaluation of control effects and crop safety of six herbicides and their combinations against weeds in direct-seeded rice fields

doi:10.16178/j.issn.0528-9017.20240451

Abstract

Abstract:

In order to explore the safe and effective weed control technology for direct-seeded rice, this study compared and evaluated the weed control effect of 6 herbicides such as florpyrauxifen and their combinations on direct-seeded rice field based on field trial method. The results showed that florpyrauxifen 3% EC (60 mL per 667 m²) had good control effects on Echinochloa oryzicola V., Murdannia triquetra (Wall.) Bruckn, Monochoria vaginalis P., Cyperus difformis L. and Cyperus iria L., had medium control effect on Heleocharis plantagineiformis Tang et Wang and slightly poor control effect on Leptochloa chinensis N. when used at the three-leaf stage. Florpyrauxifen 3% EC (80 mL per 667 m²) could cause invisible herbicide damage to rice. Florpyrauxifen 3% EC (40 mL per 667 m²)+cyhalofop-butyl 30% OD (40 mL per 667 m²) had good control effects on all experimental weeds except Heleocharis plantagineiformis Tang et Wang, when the two herbicides were mixed, florpyrauxifen 3% EC should be used at the recommended low dose, otherwise it would cause invisible harm to rice. 2-methyl-4-chlorosodium salt 56% SP combined with bentazone 480 g·L^-1 AS (150 mL per 667 m²) or fluroxypyr-meptyl 200 g·L^-1 EC (45 mL per 667 m²) had excellent control effects on Monochoria vaginalis P., and also had good control effect on Murdannia triquetra (Wall.) Bruckn, Cyperus difformis L. and Cyperus iria L., and mixed with bentazone could effectively improve the control effect of Heleocharis plantagineiformis Tang et Wang. 2-methyl-4-chlorosodium salt 56% SP 56% SP (125 g per 667 m²) had obvious drug damage to rice, but can gradually return to normal growth after spraying foliar fertilizer, when it was used at the dosage of 80 g per 667 m², it was safe to rice. Cyhalofop-butyl 30% OD (40 mL per 667 m²) had poor control effect on Echinochloa oryzicola V. and bispyribac-sodium 10% SC (20 mL per 667 m²) had poor control effect on Leptochloa chinensis N. On the whole, we recommended two combination methods, florpyrauxifen 3% EC (40 mL per 667 m²)+cyhalofop-butyl 30% OD (40 mL per 667 m²), 2-methyl-4-chlorosodium salt 56% SP (125 g per 667 m²) bispyribac-sodium 10% SC (20 mL per 667 m²)+cyhalofop-butyl 30% OD (40 mL per 667 m²), which not only have excellent control effect but also were safe to rice. In addition, if the amount of Cyperaceae weed is large, it is recommended to use MCPA-sodium 56% SP (80 g per 667 m²)+bentazone 480 g·L^-1 AS (150 mL per 667 m²) cyhalofop-butyl 30% OD (40 mL per 667 m²).

Key words: herbicide, direct-seeded rice field, weed, control effect, crop safety

CLC Number:

S451

YU Yanfang, HU Yang, HE Shijie, XU Hongle, LEI Haixia, WANG Xiaoxiao, LI Huilong, ZHU Junde. Evaluation of control effects and crop safety of six herbicides and their combinations against weeds in direct-seeded rice fields[J]. Journal of Zhejiang Agricultural Sciences, 2025, 66(2): 430-436.

Figures/Tables 4

References 27

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处理	药剂	每667 m²制剂用量
1	3%氯氟吡啶酯EC	40 mL
2	3%氯氟吡啶酯EC	60 mL
3	3%氯氟吡啶酯EC	80 mL
4	3%氯氟吡啶酯EC+30%氰氟草酯OD	40 mL+40 mL
5	3%氯氟吡啶酯EC+30%氰氟草酯OD	60 mL+40 mL
6	3%氯氟吡啶酯EC+30%氰氟草酯OD	80 mL+40 mL
7	56%2甲4氯钠盐SP+480 g·L^-1灭草松AS+30%氰氟草酯OD	125 g+150 mL+40 mL
8	56%2甲4氯钠盐SP+200 g·L^-1氯氟吡EC+30%氰氟草酯OD	125 g+45 mL+40 mL
9	56%2甲4氯钠盐SP+10%双草醚SC+30%氰氟草酯OD	125 g+20 mL+40 mL
10	56%2甲4氯钠盐SP+200 g·L^-1氯氟吡EC+10%双草醚SC	125 g+45 mL+20 mL
11	56%2甲4氯钠盐SP+480 g·L^-1灭草松AS+30%氰氟草酯OD	80 g+150 mL+40 mL
12	清水对照	0

处理	药剂	每667 m²制剂用量
1	3%氯氟吡啶酯EC	40 mL
2	3%氯氟吡啶酯EC	60 mL
3	3%氯氟吡啶酯EC	80 mL
4	3%氯氟吡啶酯EC+30%氰氟草酯OD	40 mL+40 mL
5	3%氯氟吡啶酯EC+30%氰氟草酯OD	60 mL+40 mL
6	3%氯氟吡啶酯EC+30%氰氟草酯OD	80 mL+40 mL
7	56%2甲4氯钠盐SP+480 g·L^-1灭草松AS+30%氰氟草酯OD	125 g+150 mL+40 mL
8	56%2甲4氯钠盐SP+200 g·L^-1氯氟吡EC+30%氰氟草酯OD	125 g+45 mL+40 mL
9	56%2甲4氯钠盐SP+10%双草醚SC+30%氰氟草酯OD	125 g+20 mL+40 mL
10	56%2甲4氯钠盐SP+200 g·L^-1氯氟吡EC+10%双草醚SC	125 g+45 mL+20 mL
11	56%2甲4氯钠盐SP+480 g·L^-1灭草松AS+30%氰氟草酯OD	80 g+150 mL+40 mL
12	清水对照	0

处理	药后7 d防治效果/%			药后15 d防治效果/%
处理	禾本科草	阔叶杂草	莎草科杂草	禾本科草	阔叶杂草	莎草科杂草
1	72 e	80 c	65 c	80 d	93 b	82 d
2	77 d	88 ab	75 b	85 c	98 a	88 c
3	80 cd	90 a	79 ab	86 c	99 a	92 ab
4	85 b	80 c	68 c	94 b	94 b	84 d
5	90 a	88 ab	75 b	96 ab	98 a	89 c
6	91 a	90 a	80 ab	98 a	99 a	92 ab
7	60 f	86 b	83 a	66 e	98 a	94 a
8	60 f	87 ab	76 b	66 e	98 a	88 c
9	83 bc	85 b	79 ab	94 b	97 ab	92 ab
10	58 f	88 ab	80 ab	55 f	98 a	91 bc
11	60 f	85 b	83 a	66 e	98 a	95 a

处理	药后7 d防治效果/%			药后15 d防治效果/%
处理	禾本科草	阔叶杂草	莎草科杂草	禾本科草	阔叶杂草	莎草科杂草
1	72 e	80 c	65 c	80 d	93 b	82 d
2	77 d	88 ab	75 b	85 c	98 a	88 c
3	80 cd	90 a	79 ab	86 c	99 a	92 ab
4	85 b	80 c	68 c	94 b	94 b	84 d
5	90 a	88 ab	75 b	96 ab	98 a	89 c
6	91 a	90 a	80 ab	98 a	99 a	92 ab
7	60 f	86 b	83 a	66 e	98 a	94 a
8	60 f	87 ab	76 b	66 e	98 a	88 c
9	83 bc	85 b	79 ab	94 b	97 ab	92 ab
10	58 f	88 ab	80 ab	55 f	98 a	91 bc
11	60 f	85 b	83 a	66 e	98 a	95 a

处理	稗草		千金子		水竹叶		鸭舌草		野荸荠		三棱草
处理	E_P/%	E_FW/%	E_P/%	E_FW/%	E_P/%	E_FW/%	E_P/%	E_FW/%	E_P/%	E_FW/%	E_P/%	E_FW/%
1	90.5 b	92.6 b	60.8 d	59.1 d	92.0 b	94.5 c	93.8 c	95.4 c	75.6 f	80.3 fg	87.0 d	90.5 e
2	95.0 a	98.8 a	64.3 d	61.0 d	94.8 ab	97.7 ab	96.5 b	98.9 ab	81.5 e	85.0 de	94.2 bc	96.8 bc
3	97.3 a	99.0 a	70.1 c	72.6 c	97.0 a	99.4 a	98.4 ab	99.6 a	89.0 bc	92.3 ab	98.0 a	98.7 a
4	91.2 b	93.0 b	93.5 ab	94.0 ab	92.7 b	95.2 bc	94.3 bc	95.7 c	76.0 f	78.6 g	88.1 d	91.0 e
5	95.9 a	98.6 a	95.1 a	96.3 a	95.0 ab	97.9 ab	96.0 b	97.4 bc	83.2 de	83.0 ef	92.3 c	95.6 cd
6	98.0 a	98.7 a	96.0 a	96.8 a	98.1 a	99.0 a	100.0 a	100.0 a	88.7 bc	91.1 b	95.0 bc	97.9 ab
7	46.8 c	48.0 c	90.4 b	92.1 b	96.3 a	97.8 ab	99.0 ab	99.4 ab	92.3 ab	94.0 a	96.9 ab	99.0 a
8	45.2 c	47.5 c	92.0 ab	93.7 ab	95.5 ab	98.0 ab	100.0 a	100.0 a	84.4 de	87.0 cd	93.0 c	94.4 d
9	95.8 a	97.0 a	95.6 a	95.2 a	91.8 b	93.0 c	96.5 b	96.1 c	83.7 de	86.2 cd	92.7 c	94.0 d
10	95.7 a	96.8 a	40.0 e	36.5 e	96.0 ab	97.7 ab	98.9 ab	99.5 ab	86.0 cd	87.9 c	94.2 bc	95.6 cd
11	47.5 c	47.3 c	92.5 ab	93.8 ab	95.9 ab	97.3 ab	98.3 ab	99.4 ab	94.1 a	95.5 a	97.0 ab	98.5 a
12	103.0	1 618.5	240.7	2 550.4	20.3	192.8	25.7	102.6	48.7	413.9	20.0	68.1