With the adjustment of the structure of agricultural planting industry, the planting area of ​​green soybeans, soybeans and peanuts has expanded year by year. Especially in recent years, the weeds in soybeans and peanut fields have serious occurrences, which have great influence on the yield and quality of edamame and peanuts. Effectively controlled, soybeans and peanuts generally reduce production by 20-30%, and severely reduce production by more than 50%. The reason is mainly that the grass phase of soybean and peanut fields has changed. In addition to the conventional weeds, the rapeseed seedlings in the early stage are more serious, and the normal growth of soybeans and peanuts is more obvious, and the rapeseed is more obvious. In addition to artificial seedlings, it is difficult to carry out effective chemical control. The self-growing seedlings after rapeseed harvest have become a grass damage caused by soybeans and peanut fields. In order to effectively control the rape seedlings and weeds in soybean and peanut fields, the author carried out a demonstration of the prevention and control of soybeans, peanut field rapeseed and other weeds in 2003, and achieved good control. effect.
1 Characteristics of weed occurrence
The observation results of fixed-point system showed that there were two obvious emergence peaks in rapeseed seedlings. The first emergence peak was 8.5 days after soybean and peanut sowing, and the number of emergences accounted for 85.57% of the total. The second emergence peak was after sowing. 5-7 days, the number of emergence is about 14.43%. In the early stage, weeds were dominant in rapeseed, accounting for more than 90% of the total number of weeds.
The grass weeds represented by crabgrass also have two peaks of grassing. The first peak of weeding is about 10 days after sowing of soybeans and peanuts. Synchronized with soybeans and peanuts, the number of grasses accounts for the total amount of grass. 60%--70%, the second peak of grassing in the 25-30 days after soy and peanut sowing, the number of grasses accounted for 30% -40% of the total amount of grass. There is only one grassy peak in foxtail, which is mainly concentrated in soybeans and peanuts for 10-15 days after sowing. Generally, grass yield accounts for more than 75% of the grass.
2 control technology
In the 3-4 days after the sowing of soybeans and peanuts, when most of the self-produced seedlings of rapeseed are unearthed, 20% of the water without a trace of 50--75 liters per acre plus 36% of the emulsifiable concentrate of the grass, 90 liters of water Evenly sprayed with kilograms, the control effect on rapeseed seedlings and weeds is over 90%. Once used, it can effectively prevent rapeseed and a variety of grass weeds.
3 matters needing attention
First, it is necessary to master the appropriate period of medication. The application time must be controlled within 3-4 days after soybean and peanut sowing. More than 85% of rapeseed seedlings emerged, while soybeans and peanuts were not used before they were excavated. The herbicidal effect was the most ideal; Premature drug use, rapeseed seedlings have not emerged or emerged less, the control effect on rapeseed seedlings is not good; the drug is too late, soybeans, peanuts have emerged in succession, at this time medication, it is easy to produce phytotoxicity. Therefore, according to the emergence period of soybeans and peanuts, the time of administration should be determined. The closer to soybean and peanut seedling stage, the more seedlings are produced from rapeseed, the better the control effect, but the more susceptible soybeans and peanuts are. Therefore, the medication time must be accurate, otherwise it will cause phytotoxicity. The second is to use high-efficiency pharmacy, the herbicides are not traced, and the soil sealant is better. Third, the amount of water must be sufficient when applying the medicine, not less than 50 kg, the spray should be even and thoughtful, in order to ensure the control effect.
1 Characteristics of weed occurrence
The observation results of fixed-point system showed that there were two obvious emergence peaks in rapeseed seedlings. The first emergence peak was 8.5 days after soybean and peanut sowing, and the number of emergences accounted for 85.57% of the total. The second emergence peak was after sowing. 5-7 days, the number of emergence is about 14.43%. In the early stage, weeds were dominant in rapeseed, accounting for more than 90% of the total number of weeds.
The grass weeds represented by crabgrass also have two peaks of grassing. The first peak of weeding is about 10 days after sowing of soybeans and peanuts. Synchronized with soybeans and peanuts, the number of grasses accounts for the total amount of grass. 60%--70%, the second peak of grassing in the 25-30 days after soy and peanut sowing, the number of grasses accounted for 30% -40% of the total amount of grass. There is only one grassy peak in foxtail, which is mainly concentrated in soybeans and peanuts for 10-15 days after sowing. Generally, grass yield accounts for more than 75% of the grass.
2 control technology
In the 3-4 days after the sowing of soybeans and peanuts, when most of the self-produced seedlings of rapeseed are unearthed, 20% of the water without a trace of 50--75 liters per acre plus 36% of the emulsifiable concentrate of the grass, 90 liters of water Evenly sprayed with kilograms, the control effect on rapeseed seedlings and weeds is over 90%. Once used, it can effectively prevent rapeseed and a variety of grass weeds.
3 matters needing attention
First, it is necessary to master the appropriate period of medication. The application time must be controlled within 3-4 days after soybean and peanut sowing. More than 85% of rapeseed seedlings emerged, while soybeans and peanuts were not used before they were excavated. The herbicidal effect was the most ideal; Premature drug use, rapeseed seedlings have not emerged or emerged less, the control effect on rapeseed seedlings is not good; the drug is too late, soybeans, peanuts have emerged in succession, at this time medication, it is easy to produce phytotoxicity. Therefore, according to the emergence period of soybeans and peanuts, the time of administration should be determined. The closer to soybean and peanut seedling stage, the more seedlings are produced from rapeseed, the better the control effect, but the more susceptible soybeans and peanuts are. Therefore, the medication time must be accurate, otherwise it will cause phytotoxicity. The second is to use high-efficiency pharmacy, the herbicides are not traced, and the soil sealant is better. Third, the amount of water must be sufficient when applying the medicine, not less than 50 kg, the spray should be even and thoughtful, in order to ensure the control effect.
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