Valerian, also known as grass head, is a 1-2 year herb belonging to the Leguminosae family. According to the pesticide network, in recent years, the planting area of alfalfa in Yangzhong City has been increasing, and weed infestation has become a significant issue. The main weeds found in the fields include Mai Niang, Fan, Rice, and Pork. After nearly 2-3 years of experimental trials, we have gained initial experience in controlling weed damage in grasslands using herbicides such as dichlorfen and other chemical agents.
Quercus chinensis can be planted after rice harvest or grown in greenhouses. Before sowing, it's recommended to use herbicides like glyphosate or paraquat to clear the field. Once the soil is prepared, alfalfa can be sown through shallow rotation or by using river mud for irrigation.
(1) Shallow rotation: After sowing, apply 150-200 grams of 50% dichlorpyrifos wettable powder mixed with 40-50 kg of water per acre. This method effectively controls annual grass weeds, though its performance against broadleaf weeds is slightly less effective. The treatment should be applied about 50 days before sowing.
(2) River mud sowing: For this method, spray 200% of a 50% dichlorfen wettable powder solution over the field and then sow directly into the mud. The pesticide network advises that dichlorfen is a pre-emergence herbicide used for soil treatment, and it works poorly on weeds that have already emerged. Therefore, it's essential to remove existing weeds from the field before applying the herbicide. The dose of 50% diquat wettable powder should not exceed 250 grams per acre. Always follow safety guidelines when applying pesticides to ensure both effectiveness and environmental protection.
Stem and leaf treatment is carried out in early spring based on the presence of weeds in the field. For grassy weeds, apply 10.8% high-efficiency flupirtine emulsifiable concentrate at a rate of 30-40 ml per acre mixed with water. For broadleaf weeds such as swinegrass and sorghum, use 50% herbicidal suspension at 45-60 ml per acre, or consider alternative biological pesticides. Be sure to observe the safety interval before harvesting to avoid any adverse effects.
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