Control techniques of barnyardgrass in rice

(Agricultural Wealth Network) Rice direct seeding technology has been promoted in our city for nearly ten years, and its key technology is chemical weeding technology. Some farmers have to plough and replant because they cannot solve the weeding problem, and some farmers have to double the use of quinclorac. Rice is sprayed into onion tube seedlings, but barnyardgrass still cannot be killed. The main reason is that herbicides such as direct seeding and killing barnyardgrass have been used for many years, and the Chinese gold and barnyardgrass have serious resistance to metolachlor and quinclorac. In addition, the soil preparation is extensive during direct seeding, and the water management of seedling field is not done properly, so the control of Chinese gold and barnyardgrass becomes a difficult problem.

City Agricultural Materials Corporation and the relevant experts of the Municipal Bureau of Agriculture have introduced a variety of herbicides for many experiments, from which new chemicals and new technologies for controlling Qianjin and Barnyardgrass in rice direct seeding fields, seedling fields and seedling transplanting fields have been summarized. The brief introduction is as follows:

1. 2-5 days after sowing, the link of using direct seeding net (including direct seeding green, Ruinong and other herbicides compounded by bensulfuron methyl and metolachlor) to control weeds is omitted, and about 15-18 days after sowing, the rice is controlled by rice Jie and Qianjin (10% cyhalofop-methyl) at the two-leaf and one-heart stage. 60- 80ml of rice per mu, 40ml of Qianjin mixed with 30kg of water evenly sprayed, sprayed at intervals of 24 hours before watering. This method costs more, but the safety and effect are very good, many large grain farmers in our city have used this method.

2. For the aged barnyardgrass, 100- 120ml rice per mu is mixed with 30kg water and sprayed after draining the field water, and water is supplied 24 hours after the medicine is applied.

3. At the two-leaf and one-heart stage of rice, 10% pyrisulfuron-methyl 24g and 50% quinclorac 40- 50g mixed with 30- 45kg water were sprayed on each mu. It has significant control effect on barnyardgrass, broadleaf weed and cyperaceae weed. Be careful to use pyrisulfuron methyl instead of bensulfuron methyl.

4. At the 3-5 leaf stage of rice, the 2-4 leaf stage of Chinese euphorbia is sprayed with 10% Bichu 30- 40ml mixed with 30kg of water, and the water is supplied 2 - 4 -48 hours after spraying. 6-7 Barnyardgrass can be sprayed with 10% 50- 60ml mixed with 30kg water. Special attention should be paid not to respray Baicu at high doses, which will hurt rice. The cost of this method is lower than that of rice Jie and Qianjin, and it is very effective for Chinese gold and barnyardgrass, and it is also effective for Paspalum bicolor and other grass weeds, but the safety is slightly poor, so the dosage should be strictly controlled.

5. 7-8 days after rice sowing, seedling one leaf and one heart stage, barnyardgrass needle stage, mu with Han Lesheng (10% flupyrisulfuron) 10g, clomiethyl (36% isochloraz) 35ml mixed with water 30- 45kg spray, can control and eliminate thousand gold, barnyardgrass, broad-leaved weeds and Cyperaceae weeds.

6. At the two-leaf and one-mind stage of rice, 30g of Hanlesheng (10% flusulfuron-methyl) mixed with 45kg of water can control barnyardgrass, broadleaf grass and cyperaceae weeds at the two-leaf and one-mind stage.