How to weed the wheat in the field in spring?

At present, wheat in some places is about to enter the green period, and weeds in wheat fields are unearthed and grow rapidly. Generally, there are 3- 13 weeds per square meter, and the height can reach 20. In the future, with the increase of temperature, weeds will grow rapidly, which will inevitably compete with wheat for fertilizer and water, seriously affecting the growth and yield of wheat. For the wheat fields without chemical weeding in autumn seedling stage or with poor weeding effect, it is necessary to seize the favorable opportunity from wheat turning green to jointing stage and carry out chemical weeding.

Specific control measures:

1. To control dicotyledonous weeds such as Artemisia selengensis and Capsella bursa-pastoris, 0.5g of 65438+ tribenuron-methyl dry suspension or 50-60ml of 20% chlorhexidine EC can be used per mu and sprayed with 30kg of water.

2. To control gramineous weeds such as wild oats, 60-70 ml of 6.9% Hummer can be used per mu, or 2,500 times of liquid can be used preferentially, and 30 kg of water can be added to spray evenly; To control Aegilops tauschii, 25-30ml of 3% Shima can be sprayed evenly with 30kg of water per mu.

3. In the wheat field where monocotyledonous weeds and dicotyledonous weeds are mixed, herbicides for controlling monocotyledonous weeds and dicotyledonous weeds can be mixed and applied, and multiple weeds can be controlled by spraying once. Plots with less weeds can be combined with hoeing to eliminate the harm of weeds.

3. In the wheat field where monocotyledonous weeds and dicotyledonous weeds are mixed, herbicides for controlling monocotyledonous weeds and dicotyledonous weeds can be mixed and applied, and multiple weeds can be controlled by spraying once. Plots with less weeds can be combined with hoeing to eliminate the harm of weeds.

4. Precautions: In the middle and late March, spray before wheat jointing; It is forbidden to use herbicides with long duration, such as chlorsulfuron, metsulfuron and 2,4-drip. The soil should maintain a certain humidity when using drugs; Chemical weeding should be carried out in the absence of wind and breeze; Strictly refer to the label and control the drug dosage.

After the Spring Festival, all kinds of grass germinated, and at this time, the leaves of wheat were thicker, so appropriate dosage and water were added to kill all kinds of weeds.

Choose good weather, no wind and no rain, and the temperature is above 10 degrees to ensure that there are no weeds in the whole wheat season.

The best time for weeding in wheat field is after sowing and before winter. However, the suitable sowing time this year is heavy rain, and sowing is generally late. Subsequently, many places were affected by drought and early cooling, and many people did not have time to weed before winter. So weeding in spring is particularly important.

Precautions for weeding drugs:

(1) The spraying time must be well controlled before the wheat turns green to jointing stage, and the average daily temperature should be kept above 10 degrees. Chemical herbicides should not be used after jointing stage to prevent phytotoxicity.

(2) Pay attention to the weather changes before application. If there is a strong temperature drop within 2~4 days before taking medicine, it is not appropriate to take medicine.

(3) The dosage should be strictly controlled, and it is not allowed to increase or decrease at will. For some new herbicide varieties, we must not blindly use them.

(4) When spraying, it should be uniform and thoughtful, so as to avoid leakage and no longer spraying.

(5) Select the appropriate herbicide type according to the weed species in the field.