In order to promote the scientific prevention and control of weeds in farmland, promote the reduction of the use of herbicides, and ensure the national food security and the effective supply of important agricultural products, the National Agricultural Technology Center organized relevant experts around Weed prevention and control requirements in rice, wheat, corn, soybean, potato, rape, peanut, and cotton fields. The National Agricultural Technology Center has researched and formulated the”Technical Plan for Weed Prevention and Control in Farmland 2021.” This article only extracts the relevant content of the”Potato Field Weed Control Program”.
Weeds in potato fields focus on the prevention and control of grass weeds such as crabgrass and barnyardgrass, as well as broad-leaved weeds such as amaranthus retroflexus and cow chickweed. According to potato planting patterns, weed types and distribution characteristics, carry out classification guidance.
1. Non-chemical grass control technology
agricultural measures. Clear weeds on the fields and roadsides in time to prevent weeds from invading the farmland. Take potato and gramineous, legume, cruciferous and other crop rotations, and interplant soybeans and peanuts between rows to reduce the occurrence of associated weeds. Physical measures. In the potato seedling and mid-growth stage, combined with fertilization, mechanical field tillage is used to cultivate soil to prevent and control weeds between rows. Colorless biodegradable mulching film, black and white film, and black mulching film can be used for covering and weeding in the one-year crop area in the north.
Second, chemical grass control technology
Weeds in potato fields are different due to different regions, sowing seasons and crop rotation methods, and there are certain differences in the chemical weeding strategies and herbicide varieties used.
Spring potato planting area. In the northern potato planting areas with one crop per year, the strategy of “one cover (one supplement)” is adopted for weed prevention and control. Film-covered potato fields, using soil sealing treatment and film mulching to control weeds, 3-7 days before sowing, use pendimethalin, acetochlor, fine metolachlor, napachlor and other agents and their compound formulations Carry out soil sealing treatment, after treatment, film mulch to prevent weeds. After the film-covered potato emerges, according to the occurrence of weeds in the field, supplement the stem and leaf treatment herbicides between the rows. Choose quizalofop-p-ethyl, clethodim, high-efficiency fluroxypyr and other agents and their compound formulations to control crabgrass , Barnyard grass and other gramineous weeds, use sulfensulfuron-methyl, trimethoprim, fenoxazone and other agents and their compound formulations to spray directional inter-row to control broad-leaved weeds such as amaranthus, portulaca and cow chickweed .
winter potato planting area. In the southern two- to three-cropping potato planting areas, weed prevention and control adopt the strategy of”one cover one by one” or”one kill one by one” strategy. For potato fields where the previous crop is rice, after sowing, before the seedling, the soil sealing agent is selected for the potato planting area in the same spring, and the straw is evenly covered to prevent weeds after application. For potato fields where the previous crop is vegetables or other crops, after sowing and before seedlings, the soil sealing agent is selected for potato planting areas in the same spring. At the 2-4 leaf stage of post-emergence weeds, use quizalofop-p-ethyl, clethodim, high-efficiency fluroxypyr and other agents and their compound formulations to control crabgrass, barnyardgrass and other gramineous weeds, and use sulfensulfuron , Benzosong and other medicaments and their compound formulations are sprayed between rows to prevent and control broad-leaved weeds such as Amaranthus retroflexus and Stellaria chinensis.