Control Effect and Safety of Pendimethalin-pyroxasulfone 27% EC Against Annual Weeds in Cotton Field

doi:10.11924/j.issn.1000-6850.casb2020-0716

Abstract

Abstract:

The study aims to determine the control effect and safety of pendimethalin-pyroxasulfone 27% EC soil sealing treatment on annual weeds in cotton field. Random group test design was conducted in the field pharmacodynamic experiment. The results showed that: pendimethalin-pyroxasulfone 27% EC had excellent control effect on main weeds of cotton such as Digitaria sanguinalis, Eleusine indica, Porbulaea oleracea and Amaranthus refroflexus. 40 days after treatments, the average fresh weight control effects were 86.1%, 91.7%, 96.7% and 99.3% under the effective ingredient dosage of 607.5, 810, 1012.5 and 1620 g a.i./hm² respectively, and the yield increase rate of cotton was 26.04%-28.87%. Thus, pendimethalin-pyroxasulfone 27% EC could be sprayed to control weeds in cotton field, which is safe to cotton, and the recommended dosage is 607.5-1012.5 g a.i./hm².

Key words: pendimethalin-pyroxasulfone 27% EC, cotton, weed, control effect, safety

CLC Number:

S451.2

Li Qi, Guo Wenlei, Meng Qi, Yu Jinping, Liu Yixue, Zhang Wei. Control Effect and Safety of Pendimethalin-pyroxasulfone 27% EC Against Annual Weeds in Cotton Field[J]. Chinese Agricultural Science Bulletin, 2021, 37(25): 121-124.

Figures/Tables 4

References 21

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处理	马唐	牛筋草	马齿苋	反枝苋	总体
1	86.8cd	86.2b	85.1c	92.4b	87.1de
2	92.0c	92.2b	89.7c	98.5a	92.5c
3	98.0b	98.3a	96.2b	100.0a	98.0b
4	100.0a	100.0a	100.0a	100.0a	100.0a
5	85.6d	85.3b	81.1c	87.9b	85.3e
6	88.8cd	87.9b	85.9c	90.9b	88.4d

处理	马唐	牛筋草	马齿苋	反枝苋	总体
1	86.8cd	86.2b	85.1c	92.4b	87.1de
2	92.0c	92.2b	89.7c	98.5a	92.5c
3	98.0b	98.3a	96.2b	100.0a	98.0b
4	100.0a	100.0a	100.0a	100.0a	100.0a
5	85.6d	85.3b	81.1c	87.9b	85.3e
6	88.8cd	87.9b	85.9c	90.9b	88.4d

处理	马唐	牛筋草	马齿苋	反枝苋	总体
1	82.2d	82.9cd	80.0b	88.0bc	82.9d
2	88.9c	88.6bc	85.9b	95.7ab	89.4c
3	94.3b	93.1b	92.6a	99.1a	94.5b
4	98.4a	98.9a	96.3a	100.0a	98.4a
5	81.9d	79.3d	79.3b	83.8c	81.5d
6	85.4cd	82.2cd	82.2b	86.3bc	84.9d

处理	马唐	牛筋草	马齿苋	反枝苋	总体
1	82.2d	82.9cd	80.0b	88.0bc	82.9d
2	88.9c	88.6bc	85.9b	95.7ab	89.4c
3	94.3b	93.1b	92.6a	99.1a	94.5b
4	98.4a	98.9a	96.3a	100.0a	98.4a
5	81.9d	79.3d	79.3b	83.8c	81.5d
6	85.4cd	82.2cd	82.2b	86.3bc	84.9d

处理	马唐	牛筋草	马齿苋	反枝苋	总体
1	84.8d	84.6c	82.6c	91.5bc	86.1d
2	90.5c	90.6bc	87.8c	96.8ab	91.7c
3	96.1b	95.6b	94.8b	99.7a	96.7b
4	99.2a	99.3a	98.4a	100.0a	99.3a
5	83.8d	84.4c	81.9c	86.8c	84.3d
6	87.0cd	86.7c	84.9c	89.8c	87.3d