What herbicide is good for Leymus chinensis in wheat field and when to use it?

After wheat planting, weeds such as Leymus chinensis appeared in the field, which really bothered farmers. There are two ways to weed in wheat fields: intertillage weeding and chemical weeding. After weeds appear in wheat fields, intertillage weeding is the first choice, and chemical weeding (herbicide weeding) is the last choice. Today, I will talk about the benefits of intertillage weeding and the choice of weeding herbicides.

First, intertillage weeding

Artificial intertillage weeding is a traditional weeding method with strong pertinence. It can not only remove Swertia japonica, Descurainia sophia, sheep beard and other weeds in wheat fields, but also promote wheat tillering.

1 Optimum weeding time:

When the true leaves of wheat grow to 3~4 leaves, it is the best time for intertillage weeding.

2. Benefits of intertillage weeding:

Is there a fire under the hoe? heat

Loosening soil during intertillage weeding can increase soil temperature, increase the rapid transformation of organic nutrients and urea, improve the efficiency of wheat absorbing nutrients and accelerate its growth and development. Without cultivation at low temperature, the root system grows unevenly, which affects the yield and quality of wheat.

(2) Is there any water under the hoe? Increase moisture

There are many capillary pores in the soil, from which water will evaporate at any time. Intertillage can cut off these pores to reduce the evaporation of water, close the rise of water and achieve the effect of long-term moisturizing.

(3) Is there any medicine under the hoe? Prevent diseases and treat pests

Although most bacteria on the surface can be killed by strong light, the bacteria underground are still alive. Bacteria in the soil are transferred to the soil through intertillage and then killed by ultraviolet rays. In addition, various insect pupae breed in the soil and can be killed by intertillage weeding. If an insect pupa is shoveled to death, thousands of larvae will be reduced.

(4) Is there fertilizer under the hoe? Eradicate weeds

The growth of weeds in the field will form a nutrient competition relationship with wheat. Weeding through intertillage will save the consumption of water and nutrients, increase the ventilation and light transmittance of soil, and be more conducive to the growth and development of wheat.

Intertillage weeding has many advantages. Although it takes a little effort, it is more environmentally friendly.

Second, chemical weeding (herbicide weeding)

If there is really no time for intertillage weeding, you can choose herbicides to weed, and the time for chemical weeding should be sooner rather than later. The peak of weeds unearthed between winter wheat is before winter, and only a few kinds of weeds can be seen after New Year. Basically, after 20 days of sowing, most weeds have been unearthed.

Optimum weeding time of winter wheat 1

The early winter of wheat is about the middle and late stage of 1 1. At this time, there are few weeds, and the absorption efficiency of tender stems and leaves is relatively high. Choose the weather with high and stable temperature, pay attention to the weather forecast, no cold current will come within 5~7 days, and the weeding effect is good.

2. Selection of herbicides

The following chemicals can be used for weeds such as Pennisetum, Descurainia sophia and Leymus chinensis:

15% thiophanate-methyl wettable powder 10 ~ 20g/ mu; 10% bensulfuron-methyl wettable powder 30 ~ 40g/mu; 10% clomazone wettable powder10 ~13g/mu; The following chemicals can be selected to control gramineous weeds, such as oats and milkweed:

24% propargyl EC 25 ~ 30ml/mu; 70% sulfuron-methyl was dispersed in water at a dosage of 4 grams per mu; Spraying 30~45 kg of water evenly can effectively control weeds and basically control weeds in the whole growth period of wheat.

The above is the weeding time and method of weeds such as sheep beard in wheat field. Intertillage weeding is the first choice, and herbicides can be used as the last choice. If you choose herbicides to weed, the sooner the better, so as to achieve better weeding effect.