The latest course on weeding techniques and methods of hard grass in wheat planting

Hard grass is a species of Gramineae hard grass, which is an annual or perennial Gramineae plant. The seeds propagate. The suitable emergence depth of seeds in the soil is 0.12-2.4cm, which is difficult to emerge when the depth exceeds 2.4cm, and the tillering ability is strong. There are about 6 tillers per plant and twins. Most of them grow in hills, ditches and fields, mainly harming wheat and other dry land crops. The average daily temperature after wheat sowing is 16-18 ℃ in 3-5 days, and the grass peak is formed, that is, from wheat emergence to 1-leaf stage.

Agricultural prevention and control

The implementation of flood-drought rotation is an important measure to reduce the occurrence of hard grass. Generally, the period of flood-drought rotation is 3-4 years, which can reduce the harm of hard grass. If there are serious hard grass fields, you can transplant rape or other broad-leaved crops during autumn sowing, and when the daily average temperature during the peak period of hard grass production is stable above 7 ℃, 10.8% high efficient grass energy EC can be used to kill 40ml EC and 30kg water spray per mu.

Chemical control

1. The soil is closed. Before the seedlings of barley and wheat after sowing, use 48% trifluralin EC 80 ml plus 25% green Malon wettable powder 250 grams plus water 40 kg spray per mu, the control effect is more than 98%. When sowing barley and wheat, the soil preparation quality and sowing quality should be improved, and the water consumption should be increased appropriately in the case of poor soil moisture so as to improve the control effect.

2. Stem and leaf treatment. Barley and wheat fields without soil closure treatment before seedling after sowing can be treated with stems and leaves. From the third leaf stage to the tillering stage of barley and wheat before winter, spray with 100 grams of 75% isoproturon wettable powder plus 40 kilograms of water per mu, and the control effect reached 93%; or before the jointing of barley and wheat in the following spring, the control effect was more than 90% with 150 grams of 75% isoproturon wettable powder plus 50 kg water per mu.