Potato field chemical herbicide application standard

Due to the different planting systems in China, the sowing period is inconsistent and the laws of weeds in the field are different. For example, in the north, the potato in the open field was planted in early March, and the peak of the grass was generally in the middle and late March. The amount of grass in this period accounted for about 60% of the total weeds. This batch of weeds competed fiercely with the potato, which was the main body of grass damage. To this end, the corresponding chemical herbicides should be taken for different occurrences.

1. Soil treatment of potato fields dominated by grass weeds

1. Trifluralin is a selective systemic soil treatment agent. Pre-emergence medication after sowing, 667 square meters with 48% trifluralin EC 100 ~ 125 ml (commercial quantity, the same below), 40-40 kg of water, evenly sprayed on the soil surface. It has excellent control effects on annual grass weeds such as crabgrass, goosegrass, foxtail, marmot, millennium, bluegrass, hard grass, etc., and for small seeds such as purslane, medlar, anti-twig, and pompe Broadleaf weeds also have better control effects. However, it should be noted that: 1) Accurately grasp the dosage and strive to spray evenly. 2) The soil preparation should be fine. If the whole land is not fine, the weed seeds in the clods will not be in contact with the pesticide, and the grass will still be able to emerge when the rain clods are scattered. 3) Fluorine is easy to photolysis failure. After application, the soil should be mixed immediately, and the medicine should be mixed into the soil. Generally, it is required to finish the soil within 8 hours after spraying. 4) After the application of trifluralin to the soil, the residual effect period is longer, so it is not suitable to plant sensitive crops such as sorghum and rice.

2. Shi Tianbu (Weicuotong) is a selective systemic soil-handling agent. Pesticide is used before sowing, 667 square meters with 33% applied emulsifiable concentrate 150-200 ml, and water sprayed 40-50 kg uniformly. It can effectively prevent annual grass weeds and some broad-leaved weeds such as valerian, crabgrass, foxtail, bluegrass, maiden, purslane, medlar and medlar. When using, pay attention to: 1) In case of drought, mix 3~5 cm of soil to improve the control effect; 2) avoid direct contact between seeds and chemicals; 3) apply the effect of applying straw to control grass weeds than broadleaf weeds Good, so in the field with more broadleaf weeds, consider mixing with other herbicides.

3. Diquat and Dahuili are selective systemic soil treatment agents, applied pre-emergence or pre-planting and weeds before the planting, and 667 square meters with 20% dichlorfen EC 200-300 g Or 50% Dahuili wettable powder 100 ~ 150 grams, evenly spray the surface of water 40 ~ 50 kg. For the annual grass weeds such as marmot, crabgrass, goosegrass, thousand gold, foxtail, bluegrass, etc., there are good control effects on broadleaf weeds such as purslane, alfalfa, sorghum, alfalfa, etc. Certain effect. Note when using: 1) The herbicidal effect of dichlorfen is good under soil moist conditions. If the soil is dry, it should be first poured and then applied to improve the control effect. 2) Dactylamine has poor effect on the weeds that have been unearthed. It should be applied early, and the weeds that have been unearthed should be removed before use.

Pre-medication, 667 square meters with 48% dilamine EC 150-200 ml spray water 60 kg evenly on the surface, can effectively prevent weeds, goosegrass, crabgrass, foxtail, crickets, crickets, purslane, etc. Undergraduate weeds and some broadleaf weeds.

2. Soil treatment of potato fields dominated by broadleaf weeds

Secchin selective inhalation-conducting soil treatment agent. Pre-emergence medication after sowing, 667 square meters with 70% Saikejin wettable powder 25 ~ 65 grams of water 40 ~ 50 kg evenly sprayed soil surface, can prevent a variety of broad-leaved weeds and some grass weeds, such as藜, 蓼, purslane, bitter leeks, sorghum, cocklebur, valerian, foxtail, etc. When using, it should be noted that when there is heavy rainfall or flooding in the water after application, it is easy to cause phytotoxicity.

Soil treatment of potato fields mixed with grass weeds and broadleaf weeds

1. Chlorella is a selective systemic soil treatment agent. It is used in pre-emergence and pre-emergence buds or early in germination. 667 square meters with 25% green meron WP 250-300 grams, water 40 ～50kg evenly sprayed on the soil surface, which can effectively prevent a variety of gramineous and broadleaf weeds such as Mai Niang, T. chinensis, Poa, foxtail, crabgrass, alfalfa, alfalfa, alfalfa, ear, and Po Po However, it has a poor effect on piglets, big nests, bitter leeks, and flowers. Note when using: 1) The soil is moist, which is beneficial to the effect of the drug. 2) In the soil, the residual time is long and the decomposition is slow. It is not suitable to plant sensitive crops after the cockroaches to avoid causing phytotoxicity. 3) Green mellon is poorly water-soluble. When using, the WP can be stirred with a small amount of water, and then diluted with water.

2. Gore is a herbicide for selective contact-type soil treatment with post-emergence stem and leaf treatment, and is used before sowing. 667 square meters with 24% fruit emulsifiable oil 40 ~ 50 ml water 60 kg uniform spray soil surface, can prevent valerian, thousand gold, goosegrass, foxtail, hard grass, see Mai Niang, stalk grass, bluegrass, Portulaca oleracea, iron leeks, medlar, medlar, mother-in-law, sputum, scorpion and other annual weeds, but the effect on perennial weeds is poor. Note when using: 1) When using for the first time, carry out small-scale tests according to different climatic zones, find the best application method and the optimum dosage suitable for local use, and then use it on a large scale. 2) Gore is a contact-killing herbicide, and the spray should be even and thoughtful. Do not destroy the film layer after spraying, and the dosage should be accurate.

3. And the weeds are used before the excavation to the 3~4 leaf stage, 667 square meters with 50% Ligulong wettable powder 100 ~ 125 grams, spray water surface 40 ~ 50 kg evenly, can control a variety of broadleaf weeds and Gramineous weeds, such as foxtail, goosegrass, crabgrass, valerian, medlar, medlar, cocklebur, iron leeks, purslane, ramie, piglets, crickets, etc. Attention should be paid when using: 1) It is not advisable to use this agent when the soil organic matter content is less than 1% or higher than 5%. 2) Sandy soil or rainwater should not be used for a long time.

4. Fucolon is a selective systemic soil treatment agent. Before sowing or before transplanting, it is applied before weed emergence to 1.5 leaf stage, and 667 square meters with 50% voltazone WP 100-200. Gram (low amount of sand and high amount of clay), spray the soil surface evenly with water 40-50 kg, can prevent annual grass weeds and broadleaf weeds such as crabgrass, valerian, goosegrass, foxtail, Bluegrass, sorghum, sorghum, sorghum, etc. Note when using: Mixing water can improve the efficacy.

Stem and leaf treatment of potato fields dominated by grass weeds

1. High-efficiency grass can be a selective systemic stem and leaf treatment agent. During the vigorous growth period, 667 square meters with 10.8% high-efficiency grass emulsifiable oil 40-50 ml water 40-60 kg

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