I would like to ask what pesticides are better for weedy and fake rice in the rice field.
With the expansion of the area of ​​direct-seeded rice and the extension of the planting period, the “two rices†of weedy rice and pseudo-rice are seriously affected and endangered in direct-seeded rice fields in the south and north of our province, becoming two major problems that plague the production of direct-seeded rice.
In the field of “two rices†and heavy damage, the direct seeding rice was changed to planted rice, including hand-planted rice, thrown rice, machine-inserted rice, which can quickly and effectively control the “two rice†hazards in the field. After planting rice with water after soil preparation, on the one hand, the shallow water environment in the field is not conducive to the occurrence of weedy rice, and a large number of weedy rice species are buried in deeper soil and cannot emerge (in shallow water environment, seeds of weedy rice are buried deeper The soil can not emerge; after the rice is transplanted live (usually about 1 week after planting) normally used butachlor, pretilachlor, acetochlor, quinclorac and other drugs, in a wet environment The effect of acetochlor and quincloric acid on the germination and seedling growth of weedy rice seeds was stronger. For fields with weedy rice, we usually only need to change the transplanted rice, and we can easily control the occurrence and damage of weedy rice. According to the author's observation, in the first year weedy rice had a very heavy field. In the second year, we planted rice, hand-planted rice, and thrown glutinous rice. We managed normally, and we can only occasionally see weedy rice in the field. The weedy rice in the field was removed. No matter what kind of rice cultivation method was used in the third year, including live planting, there was no weedy rice in the field.
In recent years, there are a number of large farmers in southern Jiangsu and Central Jiangsu Provinces. They adopt a slicing and rotation planting method, insert one-third of the land into the rice, and plant two-thirds of the land in direct seeding rice, three-year-round return, field miscellaneous Grass and rice and leavened rice generally do not occur, and the amount of weeds such as Thousand-gold, crabgrass, and barnyardgrasses is small.
Tip: Weedy rice, also known as red rice, japonica rice, etc., the plant more like japonica rice, the plant shape is loose. Early maturity, strong shattering, and a long dormancy period of seeds are the physiological basis for its survival and rapid spread in live rice fields. Early maturation and strong shattering make it possible for seeds to fall into the farmland earlier and will not be taken away from farmland due to normal rice harvest. After the seed matures, it has a longer dormancy period, usually only after the second year of April has been released after the dormancy, and the seeds will not germinate in the meantime. This characteristic makes the weedy rice seeds have a high winter survival rate. According to relevant research data, over 60% of weedy rice seeds can normally winterize and sprout spontaneously under the condition of no-tillage cultivation. However, the seeds of cultivated rice without dormancy often germinate before winter and fall into the field. The germinated rice seeds will all freeze to death during the wintering period, and the survival rate for overwintering is extremely low. From the perspective of large-scale production, Xintuo direct-seeded rice area, its weedy rice seed source is mainly brought into the rice. Once we enter the farmland, the weedy rice will multiply and spread, often forming a large population within 2 to 3 years, which will have a greater impact on rice yield and rice quality.
At present, the following measures are taken to prevent and control the occurrence and harm of weedy rice in production. The first is to adopt a series of measures to reduce or eliminate the seeds of weedy rice in rice seedlings. In recent years, Jiangsu Dahua Seed Industry and other units have been making great efforts to strictly take relevant measures to eliminate rice seeds with weedy rice seeds. However, there are also some small-scale seed companies. Due to poor breeding conditions, there are more weedy rice seeds in rice varieties produced. The second is to deepen the tillage and turn the seeds of weedy rice up to 15 cm below the soil layer, and the emergence rate will be greatly reduced. This measure requires large-scale tillage equipment, which is difficult to implement in production, and only part of the weedy rice can be turned into deep layers. Still more weedy rice will emerge in the field. The third is to irrigate wheat in the growing season, or after the wheat is harvested, to induce seedlings of weedy rice seedlings, and kill the live seeded rice with glyphosate, paraquat and other herbicides. Irrigation of wheat during the growing season, because the field can not be long-term accumulation of water, the effect of grazing is often not ideal, it is difficult to eradicate the weedy rice in the field. The direct seeding season of the wheat bran is very tight, and irrigation after harvesting will seriously postpone the sowing of seeds, but it cannot be implemented in the northern part of our province. The fourth is the use of herbicides. The use of a preservative-containing pretilachlor product, such as scandium, can easily produce phytotoxicity in blind valleys without causing phytotoxicity to dew-white seeds. After sowing of direct-seeded rice, these pretilins are sprayed on weeds. The occurrence of rice has a certain inhibitory effect. The effect of this measure on the direct-seeded rice field is not stable, and there is no control effect on the weedy rice in the direct-drying paddy field.
False rice is the main vicious weed in direct-seeded rice fields in northeast China. In recent years, three kinds of pseudo-rice weeds of pseudo-rice, Lee's, and Willows have been aggravated in the direct-sowing rice fields in the south and north of our province. Among them, pseudo-rice (with white hairs on the stem segments) occurs and the damage is severe. Some plots are full of pseudo-rice in the late Mt.
Fake rice is a perennial weed, occurring mostly at the edge of the gully. It sprouts long after the spring begins, and has a large amount of growth before and after wheat harvest. In addition, the growth of pseudo-rice in wheat field is small, but the perennial roots are often developed. After sowing of direct-seeded rice, new shoots sprouted rapidly on the stem section of the field pseudo-rice, first in the field, then later on as the rice grows taller and longer, and the inflorescence mainly concentrates above the rice spike layer.
During the growing season of direct rice, there is no safe and effective herbicide to selectively remove the weedy rice in the field. For the pseudo-rice rice with well-established perennial roots, all the soil-enclosing agents suitable for direct-seeded rice fields cannot be controlled; the commonly used stem and leaf treatment herbicides such as quinclorac, cyhalofop-butyl, pentaflufenachlor, etc. There is no control over fake rice. Applicable to live rice fields of the fine fazolylupirin, a better control effect on the fake rice, but the need for a larger dosage, usually about 6.9% per acre with about 80 ml of konjac oxaloquine emulsion Remove the fake rice (it should be applied in the early stage of the germination of the false rice when there are 5~6 leaves of the rice plant. The use of medicine too early and late will affect the control effect). Spraying pesticides at the rice growth stage at this dose will cause serious injury to the rice. According to reports, bispyribacin has better control effect on pseudo-rice. However, according to the author's experimental application, the drug's control effect on fake rice is also not good. From the current situation, there is no safe and effective herbicide to remove fake rice during the growing period of direct seed rice.
With the expansion of the area of ​​direct-seeded rice and the extension of the planting period, the “two rices†of weedy rice and pseudo-rice are seriously affected and endangered in direct-seeded rice fields in the south and north of our province, becoming two major problems that plague the production of direct-seeded rice.
In the field of “two rices†and heavy damage, the direct seeding rice was changed to planted rice, including hand-planted rice, thrown rice, machine-inserted rice, which can quickly and effectively control the “two rice†hazards in the field. After planting rice with water after soil preparation, on the one hand, the shallow water environment in the field is not conducive to the occurrence of weedy rice, and a large number of weedy rice species are buried in deeper soil and cannot emerge (in shallow water environment, seeds of weedy rice are buried deeper The soil can not emerge; after the rice is transplanted live (usually about 1 week after planting) normally used butachlor, pretilachlor, acetochlor, quinclorac and other drugs, in a wet environment The effect of acetochlor and quincloric acid on the germination and seedling growth of weedy rice seeds was stronger. For fields with weedy rice, we usually only need to change the transplanted rice, and we can easily control the occurrence and damage of weedy rice. According to the author's observation, in the first year weedy rice had a very heavy field. In the second year, we planted rice, hand-planted rice, and thrown glutinous rice. We managed normally, and we can only occasionally see weedy rice in the field. The weedy rice in the field was removed. No matter what kind of rice cultivation method was used in the third year, including live planting, there was no weedy rice in the field.
In recent years, there are a number of large farmers in southern Jiangsu and Central Jiangsu Provinces. They adopt a slicing and rotation planting method, insert one-third of the land into the rice, and plant two-thirds of the land in direct seeding rice, three-year-round return, field miscellaneous Grass and rice and leavened rice generally do not occur, and the amount of weeds such as Thousand-gold, crabgrass, and barnyardgrasses is small.
Tip: Weedy rice, also known as red rice, japonica rice, etc., the plant more like japonica rice, the plant shape is loose. Early maturity, strong shattering, and a long dormancy period of seeds are the physiological basis for its survival and rapid spread in live rice fields. Early maturation and strong shattering make it possible for seeds to fall into the farmland earlier and will not be taken away from farmland due to normal rice harvest. After the seed matures, it has a longer dormancy period, usually only after the second year of April has been released after the dormancy, and the seeds will not germinate in the meantime. This characteristic makes the weedy rice seeds have a high winter survival rate. According to relevant research data, over 60% of weedy rice seeds can normally winterize and sprout spontaneously under the condition of no-tillage cultivation. However, the seeds of cultivated rice without dormancy often germinate before winter and fall into the field. The germinated rice seeds will all freeze to death during the wintering period, and the survival rate for overwintering is extremely low. From the perspective of large-scale production, Xintuo direct-seeded rice area, its weedy rice seed source is mainly brought into the rice. Once we enter the farmland, the weedy rice will multiply and spread, often forming a large population within 2 to 3 years, which will have a greater impact on rice yield and rice quality.
At present, the following measures are taken to prevent and control the occurrence and harm of weedy rice in production. The first is to adopt a series of measures to reduce or eliminate the seeds of weedy rice in rice seedlings. In recent years, Jiangsu Dahua Seed Industry and other units have been making great efforts to strictly take relevant measures to eliminate rice seeds with weedy rice seeds. However, there are also some small-scale seed companies. Due to poor breeding conditions, there are more weedy rice seeds in rice varieties produced. The second is to deepen the tillage and turn the seeds of weedy rice up to 15 cm below the soil layer, and the emergence rate will be greatly reduced. This measure requires large-scale tillage equipment, which is difficult to implement in production, and only part of the weedy rice can be turned into deep layers. Still more weedy rice will emerge in the field. The third is to irrigate wheat in the growing season, or after the wheat is harvested, to induce seedlings of weedy rice seedlings, and kill the live seeded rice with glyphosate, paraquat and other herbicides. Irrigation of wheat during the growing season, because the field can not be long-term accumulation of water, the effect of grazing is often not ideal, it is difficult to eradicate the weedy rice in the field. The direct seeding season of the wheat bran is very tight, and irrigation after harvesting will seriously postpone the sowing of seeds, but it cannot be implemented in the northern part of our province. The fourth is the use of herbicides. The use of a preservative-containing pretilachlor product, such as scandium, can easily produce phytotoxicity in blind valleys without causing phytotoxicity to dew-white seeds. After sowing of direct-seeded rice, these pretilins are sprayed on weeds. The occurrence of rice has a certain inhibitory effect. The effect of this measure on the direct-seeded rice field is not stable, and there is no control effect on the weedy rice in the direct-drying paddy field.
False rice is the main vicious weed in direct-seeded rice fields in northeast China. In recent years, three kinds of pseudo-rice weeds of pseudo-rice, Lee's, and Willows have been aggravated in the direct-sowing rice fields in the south and north of our province. Among them, pseudo-rice (with white hairs on the stem segments) occurs and the damage is severe. Some plots are full of pseudo-rice in the late Mt.
Fake rice is a perennial weed, occurring mostly at the edge of the gully. It sprouts long after the spring begins, and has a large amount of growth before and after wheat harvest. In addition, the growth of pseudo-rice in wheat field is small, but the perennial roots are often developed. After sowing of direct-seeded rice, new shoots sprouted rapidly on the stem section of the field pseudo-rice, first in the field, then later on as the rice grows taller and longer, and the inflorescence mainly concentrates above the rice spike layer.
During the growing season of direct rice, there is no safe and effective herbicide to selectively remove the weedy rice in the field. For the pseudo-rice rice with well-established perennial roots, all the soil-enclosing agents suitable for direct-seeded rice fields cannot be controlled; the commonly used stem and leaf treatment herbicides such as quinclorac, cyhalofop-butyl, pentaflufenachlor, etc. There is no control over fake rice. Applicable to live rice fields of the fine fazolylupirin, a better control effect on the fake rice, but the need for a larger dosage, usually about 6.9% per acre with about 80 ml of konjac oxaloquine emulsion Remove the fake rice (it should be applied in the early stage of the germination of the false rice when there are 5~6 leaves of the rice plant. The use of medicine too early and late will affect the control effect). Spraying pesticides at the rice growth stage at this dose will cause serious injury to the rice. According to reports, bispyribacin has better control effect on pseudo-rice. However, according to the author's experimental application, the drug's control effect on fake rice is also not good. From the current situation, there is no safe and effective herbicide to remove fake rice during the growing period of direct seed rice.
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