What medicine is used for older barnyard grass?

Barnyardgrass is the most serious weed in rice fields, and many farmers have a headache about it. If barnyardgrass grows too fast, it is difficult to kill, so what medicine should be used for older barnyardgrass?

What kind of medicine is used for older barnyardgrass?

Old paspalum grass can be controlled by herbicides such as cyanofluoxate, oxazolyl, pentafluorosulfonamide, Lingske chlorofluoropyridine ester and so on. Generally, the effect of medication is the best in the 2-3 leaf stage. Missed the period of drug use, not only the cost of drug use increased, but also the leaf age of paspalum grass was too old to control.

Second, why is barnyardgrass in rice fields so difficult to weed?

The main results are as follows: 1. Barnyardgrass has many species, great interspecific changes, lax living environment and strong adaptability. Barnyardgrass is a malignant weed in the main farmland in China, with hundreds of species; by seed germination, barnyardgrass seeds can survive in the soil for several decades, as long as the germination conditions are met, and they can germinate and grow greatly; barnyardgrass can grow in both water and drought environment with strong adaptability and competitiveness. this living habit is the root cause of the serious occurrence of barnyardgrass.

2. Because the seeds of barnyardgrass survive in the soil for a long time, and barnyardgrass seeds accumulate year after year, the number of barnyardgrass seeds in the field increases continuously, and the germination and growth of barnyardgrass will increase accordingly.

3. The control of barnyardgrass is not complete, the use of medicine is less in the early stage, and the occurrence of barnyardgrass is serious in the later stage.

4. The emergence of drug resistance of barnyardgrass. In recent years, with the extensive use of chemical herbicides, and the alternate use of herbicide varieties is less, long-term use of a single variety, induced barnyardgrass drug resistance, increasing drug consumption per mu, the registered dosage is often not obvious.

5. Improper use of herbicides. The use of herbicides is determined by its own performance, the closed herbicide can only have an effect on the seeds of weeds, and the treatment of stems and leaves can only affect the stems and leaves of weeds. Of course, the effect of different barnyardicide is different, and even the effect is very different: if using Hedazhuang and sodium dichloroquinolinate, it can not be drained, but wp and Daojie need to be drained. The correct use of barnyardgrass is one of the key measures to effectively control the occurrence of barnyardgrass and improve the effect of weeding.

Barnyardgrass must be killed as soon as possible, otherwise missed the best period, it will be very difficult to deal with, affecting the normal growth of rice.