Use of cassava field herbicide composition in preventing and treating cyperus rotundus

Abstract

The invention provides a cassava field herbicide composition which is a ternary herbicide composition with active components of halosulfuron, oxyfluorfen, and an amide herbicide. The composition comprises the components of, by weight: 1-9% of halosulfuron, 2-16% of oxyfluorfen, 24-75% of the amide herbicide, 7-42% of a solvent, and 7-27% of an auxiliary agent. The amide herbicide is one of butachlor, propisochlor, and fine metolachlor. The herbicide composition provided by the invention has significant synergetic effect and wide herbicidal spectrum, and has significant soil enclosing effect against broad leaf weeds, grass weeds, and cperaceae weeds. Especially, a soil enclosing effect against cyperi rhizome is significant. The composition has low harm to cassava, low toxicity, and low residue. With one-time dosage, weed harm of an entire duration period can be controlled.

Description

technical field

[0001] The invention relates to the technical field of pesticides, in particular to the use of a cassava field herbicide composition for controlling Cyperus cyperi. Background technique

[0002] Cassava is one of the preferred crops for the production of fuel ethanol. At present, the perennial planting area of ​​cassava in my country is about 450,000 hectares, with a total output of about 7 million tons. In recent years, with the popularization of ethanol gasoline, the demand for cassava has continued to increase, and the planting area has also continued to expand. Weed damage is one of the important factors affecting cassava yield. Weeds in cassava fields occur early, in large numbers, and cause serious damage. Manual weeding is an important means of weed control in cassava fields, but manual weeding is labor-intensive and time-consuming, and the effect is poor; chemical weeding has the advantages of high efficiency and cost saving, and is one of the necess...

Examples

Embodiment 1

[0021] Embodiment 1: Indoor safety of herbicides and its toxicity to Radix Cyperi

[0022] The cassava stems with the same size and stem length of 15cm and the underground stems of Cyperus cyperi are planted together in a 20cm in diameter and 18cm high culture tray, 2 stems are placed in each tray of cassava, and 30 underground stems are planted in each tray of Cyperus cyperi. Then the herbicide is sprayed by the soil spray method, and the quantitative spray tower is used for spray treatment, and the spray liquid volume is calculated as 675 kg / ha. After treatment, they were cultivated in the greenhouse. The inhibition rate of cassava plant height and the control effect of Cyperus cyperi were investigated and calculated 40 days after application.

[0023] This experiment is divided into experimental group and control group. The experimental group was divided into three groups:

[0024] (1) Composition 5, the dosage is 1688.89 mg / kg;

[0025] (2) Composition 14, the dosage i...

Embodiment 2

[0031] Embodiment 2: Determination of herbicide efficacy and safety in field

[0032] 3 days after cassava planting, during cassava and weed germination. Use different herbicides or herbicide combinations for uniform spraying, and each treatment has 4 repetitions, and the plot area of ​​each repetition is 30㎡. 40 days after treatment, the control effects of various weeds were investigated and counted. 10, 20, 30, and 40 days after treatment, visually inspect cassava for phytotoxicity, and record the symptoms, grades and recovery of phytotoxicity.

[0033] This experiment is divided into experimental group and control group, and the experimental group is divided into 27 groups: oxyfluorfen + acetochlor + clopyrazosulfuron, oxyfluorfen + butachlor + clopyrazosulfuron , oxyfluorfen + metolachlor-smart + pyrazosulfuron-methyl ternary compound composition, nine groups of experiments were respectively carried out according to different dosages per hectare.

[0034] The control ex...

technical field

[0001] The invention relates to the technical field of pesticides, in particular to the use of a cassava field herbicide composition for controlling Cyperus cyperi. Background technique

[0002] Cassava is one of the preferred crops for the production of fuel ethanol. At present, the perennial planting area of ​​cassava in my country is about 450,000 hectares, with a total output of about 7 million tons. In recent years, with the popularization of ethanol gasoline, the demand for cassava has continued to increase, and the planting area has also continued to expand. Weed damage is one of the important factors affecting cassava yield. Weeds in cassava fields occur early, in large numbers, and cause serious damage. Manual weeding is an important means of weed control in cassava fields, but manual weeding is labor-intensive and time-consuming, and the effect is poor; chemical weeding has the advantages of high efficiency and cost saving, and is one of the necess...

Examples

Embodiment 1

[0021] Embodiment 1: Indoor safety of herbicides and its toxicity to Radix Cyperi

[0022] The cassava stems with the same size and stem length of 15cm and the underground stems of Cyperus cyperi are planted together in a 20cm in diameter and 18cm high culture tray, 2 stems are placed in each tray of cassava, and 30 underground stems are planted in each tray of Cyperus cyperi. Then the herbicide is sprayed by the soil spray method, and the quantitative spray tower is used for spray treatment, and the spray liquid volume is calculated as 675 kg / ha. After treatment, they were cultivated in the greenhouse. The inhibition rate of cassava plant height and the control effect of Cyperus cyperi were investigated and calculated 40 days after application.

[0023] This experiment is divided into experimental group and control group. The experimental group was divided into three groups:

[0024] (1) Composition 5, the dosage is 1688.89 mg / kg;

[0025] (2) Composition 14, the dosage i...

Embodiment 2

[0031] Embodiment 2: Determination of herbicide efficacy and safety in field

[0032] 3 days after cassava planting, during cassava and weed germination. Use different herbicides or herbicide combinations for uniform spraying, and each treatment has 4 repetitions, and the plot area of ​​each repetition is 30㎡. 40 days after treatment, the control effects of various weeds were investigated and counted. 10, 20, 30, and 40 days after treatment, visually inspect cassava for phytotoxicity, and record the symptoms, grades and recovery of phytotoxicity.

[0033] This experiment is divided into experimental group and control group, and the experimental group is divided into 27 groups: oxyfluorfen + acetochlor + clopyrazosulfuron, oxyfluorfen + butachlor + clopyrazosulfuron , oxyfluorfen + metolachlor-smart + pyrazosulfuron-methyl ternary compound composition, nine groups of experiments were respectively carried out according to different dosages per hectare.

[0034] The control ex...

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