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Method for controlling weeds such as soybean and rapeseed seedlings
With the adjustment of the structure of agricultural planting, the planting area of ​​young soybeans, soybeans, and peanuts has been expanding year by year. In particular, the weeds in soybeans and peanut fields have been seriously affected in recent years and have a great impact on the yield and quality of soybeans and peanuts. With effective control, soybeans and peanuts generally reduce production by 20-30%, and severely reduce production by more than 50%. The main reason is that the grasses in soybeans and peanut fields have changed. In addition to the damage caused by conventional weeds, the previous rape seedlings occur more severely, and the effect on the normal growth of soybeans and peanuts is more obvious. In addition to artificial seedlings, self-seeding seedlings are difficult to carry out effective chemical control. The self-grown seedlings that were harvested from rapeseed have become grassy pests that are harmed by soybeans and peanuts. In order to effectively control the rapeseeds and weeds in soybeans and peanut fields, in 2003, the author conducted a demonstration of control of soybeans, rapeseed seedlings, and other weeds with no traces of quercusine and achieved good control. effect. 1 Characteristics of the occurrence of weeds The fixed-point system observation results showed that the seedlings of rape have two obvious emergence peaks. The first emergence peak was 2-3 days after sowing of soybeans and peanuts, and the number of seedlings accounted for 85.57% of the total; The peak of emergence was 5-7 days after sowing and the number of emergence was about 14.43%. The early weeds accounted for the absolute advantage of rape seedlings, accounting for more than 90% of the total number of weeds. The grassy weeds represented by the crabgrass also have two peaks of weeding. The first peak of the grass is about 10 days after sowing of soybeans and peanuts. It is synchronized with the emergence of soybeans and peanuts, and the amount of grass weeds accounts for the total amount of grass weeds. 60% - 70%, the second peak in the 25 ~ 30 days after soybean, peanut sowing, grass count accounted for 30% - 40% of the total amount of grass. There is only one peak of grass in the green foxtail, mainly concentrated in soybeans, peanuts 10-15 days after sowing, the general amount of grass accounting for more than 75% of its grass. 2 Control techniques In the 3-4 days after sowing of soybeans and peanuts, when most of the seedlings of rape are unearthed, they use 20% of traceless water per acre 50-75 litres of water and 36% of astragalus oil 90 liters. Spraying evenly on 50 kilograms of water, the control effect of self-producing seedlings and weeds of rapeseed can reach more than 90%, and the self-producing seedlings of rape and various grass weeds can be effectively controlled once. 3 Precautions Firstly, it is necessary to grasp the appropriate period of medication. The application time must be controlled within 3 to 4 days after soy and peanut sowing. The self seedlings of rape must be more than 85% of the seedlings, while the soybeans and peanuts should not be used before exhumation. The most ideal; medication is too early, rape seedlings have not emerged or emerged less seedlings, seedlings of rape have poor control effect; medication too late, soybeans, peanuts emerged one after another, this time medication, can easily produce phytotoxicity. Therefore, the time of application should be determined based on the emergence period of soybean and peanut. The closer to soybean and peanut application, the more seedlings emerge from seedlings, and the better the control effect, but the more susceptible the soybeans and peanuts are to phytotoxicity. Therefore, it must be accurate to use drugs, otherwise it will produce phytotoxicity. The second is to use high-efficiency drugs on the roads, and to eliminate all herbicides without traces, and the soil sealant should be used as the herbicide. Third, the amount of water must be sufficient when spraying, not less than 50 kilograms, spraying should be uniform and thoughtful, in order to ensure the control effect.