Under normal circumstances, the amount of grass before winter wheat can reach 70% to 80% of the total, and only 20% to 30% after winter. If the soil moisture at the time of sowing is appropriate, the sensation is better and the amount of grass can be as high as 95%. the above. Grasping this favorable period and developing pre-winter weed removal can greatly reduce the number of weed bases in winter wheat fields. The weed grasses that germinate after the beginning of spring are much younger than wheat seedlings, and can be easily replaced with stem and leaf treatment agents. Significantly reduce medication costs and labor costs. In addition, the contact between the agent and wheat seedlings and malt is reduced during soil treatment, which reduces the possibility of phytotoxicity.
All over the country, we should choose the herbicide based on the type of weeds in the wheat field:
The second is a hard wheat straw or wheatgrass-based wheat field. 25% Isoproturon WP and 50% Isoproturon WP can be used. The active ingredient is 75g per acre. , spray 40 to 50 kg of water. After weeding out, use 50 g per liter of acre per gram, 70-90 ml of oxazolinergast emulsifiable concentrate, or 6.9% of oxaprozol oxime herb emulsion in 90-110 ml, or 15% of acetylene Grass WP can be 30 ~ 40 ml is also good.
The first is to look at the acre wheat, wheat amazon-based wheat, with 50 g/L of energy per acre, 60-80 ml of oxazolinergide EC, or 6.9% of a valerium oxaprozole emulsion 80 to 100 ml, 40 kg of water, spraying after weeding.
Third, a wheat field dominated by broad-leaved weeds such as pigweed and leek, and 20% chlorofluoropyroxyl EC (20 to 25 ml/mu) and a mixture of A Make it 20% chlorofluoropyrrolidone cream 20 ~ 25 ml, 20% dimethyl tetrachlorohydrin 150 ml spray) control. Pentium can also be used 36% zotramethyl sulfonazoon wettable powder, weeds after spraying with 5 ~ 7.5 grams per acre.
In order to improve the weed control effect, the following points must be noted:
The third is to ensure safe medication. Grasp the cold tail warmer and use it when there is no water in the field to avoid phytotoxicity. It is best to choose a small, sunny day at noon. During the cold period or in low-lying water plots, isoproturon should not be used.
The first is to strictly grasp the appropriate period of medication. It is advisable to use the medicine in late November, pay attention to the weather forecast in advance, choose a sunny day, there is no frost and heavy rain in 4 days, and the field does not have muddy water, and the average temperature is higher than 8°C.
The second is to pay close attention to the quality of medication. It is necessary to use a sufficient amount of medicine and water to spray mist and strive to improve the control effect. Before and after application, the field must maintain a certain humidity in order to ensure the normal function of the efficacy. It is advisable to take advantage of the favorable timing of the rain. The drought-hit fields should be filled with water and then drained, and then used for medicinal purposes.
In addition, chlorosulfuron, metsulfuron-methyl and its compounding agents should not be used in consideration of the safety of wheat field herbicides on the crops under the crop.
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