Weeding operations are divided into closed weeding and stem leaf weeding. Closed weeding is generally carried out before sowing, which can greatly reduce the germination base of weeds, and then weeding the stems leaves in a timely manner according to the growth of the weeds.Chemical weeding is the most effective method for rice, and direct-seeded paddy fields usually adopt the weeding strategy of "three ways under below".
1, Referring to the use of the soil position difference between the weed seeds and the rice seeds after the rice is sowed. For fields with a high weed base, select some herbicides or formulas with a broad weed-killing spectrum and good soil sealing effect. Fully control the emergence of the first weeding peak.
2, Refers to weeding before and after the three-leaf stage of rice and the 2-3 leaf stage of weeds. At this time, the operation can not only effectively control the remaining old weeds in the early stage, but also effectively control the second weeding peak.
3, It refers to the targeted selection of herbicides for spraying 30-35 days after sowing. Blocking first and then killing is a feasible method to solve the problem of increasing weed resistance and large weed occurrence. Among them, the effect of "blocking" is very important. The requirements of an ideal blocking agent are safety, good weeding effect, and long lasting effect.
