A method of reducing the application of herbicides and increasing the efficiency of the control of Paddy-field Sternia chinensis

Abstract

The invention relates to a weed killer application reduction synergic method for preventing rice field pondweed. The method comprises the steps that when pondweed seedlings are 28-34 days old, namely,on 2-8 days after pondweed seedling leaves are turned from red to green completely, a weed killer prometryn and fulvic acid are mixed with 30 kilogram / mu of water, and directional stem leaf spray issprayed to the surface of weed plant; when pondweed seedling leaves are gradually turned from red to green, water is removed from the rice field by 2 cm or below, 2 days after pesticide is applied, irrigation is performed, and a 4-6 cm thick water layer is kept for 8-10 d. The method has the advantages that the effective consumption of prometryn is lowered by 30.0-35.0%, the application is reducedby 15.0-17.5 gai / mu, the pondweed prevention effect is increased by 16-22.5%, the 90% or more substantial application reduction synergic effect is achieved, and guarantees are supplied to efficient,safe and economical chemical pondweed prevention.

Description

Technical field [0001] The invention belongs to the technical field of plant protection for the prevention and control of weeds in farmland, and specifically relates to a method for net reduction and efficiency increase of the herbicide promethoprim for the prevention and control of the prickly pear weeds in rice fields. Background technique [0002] Potamogeton distinctus A. Benn. is a perennial aquatic herb of Potamogeton distinctus A. Benn. It occurs in the northeast, north, northwest, southwest, central and east of China and is a vicious weed that damages rice production. Pondweed can be propagated through rhizomes and seeds, and overwintering buds develop into new plants in early April. The flowering period is from May to June, and the fruiting period is from July to August. In the early stage of vegetative growth, the buds on the rhizomes develop into new rhizomes and stems and leaves on the ground. When the fruit is mature, it is scattered in the water. Because the exoca...

AI Technical Summary

Problems solved by technology

Literature reports that 20 to 25 days after rice transplanting, when the eye vegetable turns from red to green, mix 20 to 30 kilograms of moist fine sand and spread it evenly, and keep a shallow water layer of 3 to 5 cm in the field during application, and the effective dosage per mu (ai ) 50-65 grams, but the safety of rice is poor, especially sandy soil with low organic matter content should not be used

[0006] The application of chemical herbicides has long been the main means of controlling weeds in paddy fields, and is crucial to promoting stable and high grain yields. However, the large amount of pesticides used and the unscientific application methods not only increase production costs, but also lead to excessive pesticide residues in agricultural products, Crop injury, environmental pollution, serious threats to the quality and safety of agricultural products and the safety of the ecological environment and other serious problems, for this reason, the Ministry of Agriculture of my country has formulated the "Action Plan for Zero Growth in Pesticide Use by 2020"

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