The key to rice direct seeding cultivation is the problem of chemical weeding in paddy fields, such as incomplete weed control, susceptibility to phytotoxicity, and excessive weeding costs. At present, the production of late rice in our province is about to begin. When we broadcast live late rice, we must remember to do a good job of herbicide and herbicide.
The species of weeds in direct seeding rice fields mainly include alfalfa grass, Qianjin, sedge, sedge grass, cow felt, duckweed, dwarf arrowhead, and festival vegetables. At present, there are mainly pre-emergence herbicides and post-embryonic stem and leaf treatment agents in the rice field.
Pre-emergence herbicides used for weed control have the following causes of poor efficacy:
The whole field is uneven and the field level is too big. Because pre-emergent herbicides rely on the formation of a layer of medicinal film on the mud surface of the field, it is difficult to form a film on fields with high and low levels, and it is difficult to prevent weeds at high heights.
Water retention after the application is not good. After the preemergence herbicide is applied, when the seedlings reach the two-leaf and one-hearted state, water conservation is required to keep the field surface water until the field is dried. Poor water retention also results in poor weed control.
Improper use of medication. General pre-emergent herbicides require that the whole application time to the final application time not exceed 5 days, otherwise the weeds have grown up and the preemergence herbicides cannot guarantee the weed control effect.
The selection, use time, and the amount of the drug used are all likely to cause yellowing, dwarfing, and stiff seedlings. The pre-emergence herbicides known as pre-emergence herbicides such as pre-emergence herbicides, preclochlor and propyl benzyl, which are currently on the market, are not added with safeners. Therefore, they must be planted and rooted in rice so that they can be reached once or twice. After strict use according to the recommended dosage, otherwise it is prone to phytotoxicity.
If we do not use pre-emergence herbicides, and we use herbicides that are treated with stems and leaves after weeding, it will cause high drug costs and severe damage to weeds in the early stage of seedlings.
At present, the commonly used stem and leaf herbicides include dichloroquinolinic acid, Indigenin, daughter gold, dimethyl tetrachlorine, etc. The cost of rice flour and daughter gold is high, and rice japonica can only kill grasses, sedge weeds and broadleaf leaves. Weeds, daughters can only kill thousand weeds and other weeds. Dichloroquinolinic acid can only eliminate weed grass and some Cyperaceae weeds. Due to the complexity of field weeds, it generally requires several agents to be used at the same time. When using dichloroquinolinic acid, it is easy to produce phytotoxicity.
Through many years of research, experiments and demonstrations on the weeding technology in the field, the author has summarized the following solutions to ensure that the rice field can be used once in a single dose and that it will not be harmed by weeds during the whole growing period. It is also a kind of scientific and economical method for direct field weeding.
Before the planting, the whole field is finely finished, so that the level of the field block is basically the same, and the time for applying the last field sweeping can not exceed 5 days.
The sowing seed valley needs to prompt good buds and ensure that the buds have roots and buds before sowing.
The preferred pre-emergent herbicide formula, based on many years of demonstration, can eliminate the main weeds in paddy fields at once.
1, the United States Monsanto company's new Marshall 100 ml per acre 10% Bensulfuron 30 grams (for broad-leaved weeds plus Bensulfuron, but the choice of bensulfuron must be regular large Factory production).
2. Add 100 ml of preservative acetochlor per acre (such as sulfite) or complex preparations of pretilachlor and benzulfuron containing safener (according to the recommended dosage, but most of such complex formulations currently Without safeners, be careful with purchases). This type of formulation has a poor effect on emerging grasses.
It is advisable to have the correct time of use and it should be within 5 days after sowing.
Do a good job in paddy field management. When the pesticide is applied, there is muddy water in the field, but there can be no water accumulation. After the seedlings reach a leaf stage, the shallow water is poured and the non-submerged shallow water layer of the seedling leaves is kept till the field is dried.
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