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Composition for preventing and removing weeds in rice field

A weed control and paddy field technology, applied in the field of agrochemicals, can solve the problems of poor broad-leaved weed control effect, generation of weed resistance, poor rice safety, etc.

Inactive Publication Date: 2012-08-01
HARBIN FULI BIOCHEM TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to long-term and large-scale use, weed resistance is produced, and the control effect is reduced.
Pretilachlor is also used to control gramineous weeds in paddy fields, but its control effect on broad-leaved weeds is poor; clomazone and oxyfluorfen are effective on both gramineous and broad-leaved weeds, but they are not effective against broad-leaved weeds. Poor safety to rice and prone to phytotoxicity

Method used

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  • Composition for preventing and removing weeds in rice field
  • Composition for preventing and removing weeds in rice field
  • Composition for preventing and removing weeds in rice field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1 Synergism

[0009] Indoor bioassay experiments were designed according to Colby's method. The test results showed that pretilachlor used alone at 150 and 200 g a.i. / ha had a growth inhibition rate of 35% and 60% on barnyardgrass, and 38% and 45% on carp intestine; and 140 g a.i. / ha were 29% and 36% respectively to barnyardgrass growth inhibition rate, respectively 35% and 53% to carp intestine inhibition rate; The inhibition rates of grass growth were 35% and 51%, respectively, and the inhibition rates of carp intestine were 37% and 63%. Pretilachlor + oxadiazone + oxyfluorfen mixed use set 150+70+60, 150+70+120, 150+140+60, 150+140+120, 200+70+60 g a.i. / ha five The growth inhibition rates of barnyardgrass were 77%, 89%, 85%, 90% and 82% when mixed in proportion. The control effects of the five mixed treatments on weeds were all higher than the theoretical control effects calculated by Colby's method. The results show that the combination of pretilachlo...

Embodiment

[0010] Example: Safety Evaluation of Rice

[0011] To evaluate the safety of mixed application of pretilachlor + oxadiazone + oxyfluorfen on rice in the greenhouse. The barnyardgrass and crops tested were grown in the greenhouse. Pack 4 / 5 of the loam in 9cm×9cm plastic pots, and sow barnyardgrass and paddy rice in different plastic pots. Sow 30 barnyardgrass seeds per pot, and cover with 0.5 cm of soil after sowing; sow 15 seeds per pot of pregerminated white rice seeds, and cover with 0.5 cm of soil after sowing. Water every other day to keep the soil moist to facilitate the emergence and normal growth of barnyardgrass and rice. Rice seedlings are fixed at the 2-leaf stage, with 10 seedlings per pot, and then the water layer management of transplanting rice in the field is simulated to maintain a 1-2cm water layer. See the table below for treatment doses:

[0012]

[0013] The experimental design was a completely random arrangement with 4 repetitions. Mix the test age...

Embodiment 3

[0017] Example 3: 34% WP

[0018] Mix 15 parts of pretilachlor, 7 parts of oxadiazone, 12 parts of oxyfluorfen, 10 parts of WPA-9503 compounding additive, and 56 parts of kaolin, and pulverize to obtain a wettable powder with an active ingredient of 34%.

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PUM

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Abstract

The invention relates to a composition for preventing and removing weeds in a rice field, which is characterized by containing three active ingredients: 1 to 30 percent of pretilachlor, 1 to 20 percent of oxadiazon and 1 to 20 percent of oxyfluorfen. The weeding composition can be processed into wettable powder, cream, microemulsion and a suspending agent. The composition is used for preventing and removing main weeds in the rice field, is safe to the paddy rice, has a wide control spectrum of weeds, and can control the harm of the weeds during a whole vegetation period of the paddy rice after being applied at one time.

Description

technical field [0001] The invention relates to a novel combined rice field herbicide, which belongs to the field of agricultural chemicals. Background technique [0002] The damage of weeds causes serious loss of rice yield. At present, the mixture of butachlor and bensulfuron-methyl is widely used in the control of rice weeds. Due to the long-term and large-scale use, the weed resistance is produced, and the control effect is reduced. Pretilachlor is also used to control gramineous weeds in rice fields, but its control effect on broad-leaved weeds is poor; clomazone and oxyfluorfen are effective on both gramineous and broad-leaved weeds, but they are not effective when used alone Poor safety to rice and prone to phytotoxicity. On the basis of many years of experiments, we invented the herbicidal combination of pretilachlor, oxadiazone and oxyfluorfen, which can control the main weeds in paddy fields with one use. Contents of the invention [0003] The present inventi...

Claims

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Application Information

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IPC IPC(8): A01N43/824A01N37/22A01N33/22A01P13/00
Inventor 杨滨立
Owner HARBIN FULI BIOCHEM TECH DEV
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