Sorghum is a widely grown crop that is grown in many parts of the country. However, weed problems are often encountered during planting, which seriously affects the growth of sorghum. This article introduces in detail the different stages of sorghum chemical weeding methods and common products for your reference.
I. Soil treatment before sowing
Chemical weeding from high sorghum to pre-emergence is a method of using time difference selection to control weeds. It is sprayed with chemical herbicides before the seedlings are unearthed after sowing seeds of sorghum seeds, and the seeds of weeds germinate early, and will quickly absorb and kill after the medicine, achieving the purpose of weeding. Currently widely used. There are several methods for chemical weeding in post-emergence pre-emergence commonly used in Gaochuntian:
1, 25% green mellon wettable powder, 200-300 grams per acre, 50 kg water, evenly sprayed on the soil surface. It can effectively prevent annual weeds such as crabgrass, foxtail, alfalfa and alfalfa. However, it is basically ineffective for swine fever, sage, snail, chicory, sorrel, and alfalfa.
2, 25% green mellon wettable powder, 150 grams per acre, add 50% chlorpyrifos EC 150 ml, or add 60% butachlor EC 50 ml, water 45 kg ~ 50 kg, sprayed on the soil surface . It has good control effect on annual grass weeds, sedge weeds and broadleaf weeds.
3, 80% herbicide ether (also known as Maodu, carboxy herbicide ether 1 wettable powder, 75-120 grams per acre, 35 kg to 40 kg of water, sprayed on the soil surface. In case of drought, increase the exchange The amount of water and the shallow 耙 2 cm to 3 cm after spraying the liquid make the liquid and the soil fully mixed, increasing the chance of contact with the weed seedlings and improving the herbicidal effect.
4, 72% metolachlor EC, 100 ml ~ 150 ml per acre, about 35 kg water, sprayed on the soil surface; or with 72% metolachlor EC 75 ml per acre, plus 40% 100 ml of atrazine suspension was sprayed on the soil surface with 35 kg of water.
5, 50% Ligulong wettable powder 150-200 grams per acre, 40 kg water, evenly sprayed on the soil surface.
6, 50% Putin WP can be used in an amount of 200 grams to 300 grams per acre, 40 kilograms of water, evenly sprayed on the soil surface.
7, 48% paraquat water agent, 25 ml ~ 40 ml per acre, 35 kg water. Or herbicide 20 ml ~ 30 ml plus 40% atrazine suspension 150 ml ~ 200 ml, or add 48% alachlor (also known as cable) EC 200 ml ~ 300 ml, 35 kg water, evenly Spray on the surface of the soil.
8. 40% simazine capsule suspension is used in an amount of 200 ml to 300 ml per acre, 40 kg of water, and evenly sprayed on the soil surface. Note that this medicine has a long-term effective period. It is not advisable to arrange wheat, rapeseed, soybean and other crops after the crops are cropped. When the corn is harvested according to corn and sugar cane, the dosage can be increased to 500 ml per mu.
Second, seedling stem and leaf treatment
Chemical weeding in seedling stage is the use of herbicides in the metabolism of crops and weeds in different biochemical processes to achieve the goal of eliminating grass and seedlings. The sorghum is 5 to 8 leaf stage after emergence, and it has strong drug resistance. It is safer to use chemical herbicides, and it is sensitive to herbicides before and after 5 leaves. Therefore, chemical weeding in sorghum seedling stage is generally carried out in the 5-8 leaf stage. Otherwise it is easy to cause phytotoxicity. The sorghum chemical weeding is mostly treated with soil before sowing, and it is generally not suitable to spray herbicides at the seedling stage. If the seedling stage is indeed serious due to the grassland shortage, the spraying time, concentration and variety should be strictly controlled to avoid the key points. The commonly used seedling chemical weeding methods for sorghum are:
1, 72% 2,4-D butyl ester emulsifiable concentrate, 40 ml ~ 65 ml per mu, about 35 kg of water, in the 4 ~ 5 leaf stage after sorghum emergence, depending on weeds, evenly sprayed on weed stems and leaves surface. It mainly controls broadleaf weeds and sedge weeds, but it is not effective against grass weeds.
2, 40% atrazine gel suspension, 200 ml ~ 250 ml per acre, 35 kg water, in the sorghum 4 ~ 5 leaf stage, evenly spray the weed stems and leaves. It can control single, dicotyledonous weeds and deep-rooted weeds.
3, 20% methochlorinated water, 100 ml per acre and 12.5 ml of 48% paraquat water, 35 kg of water, 4 to 5 leaf stage after sorghum emergence, evenly spray weed stems and leaves.
Particular emphasis note: sorghum is sensitive to chemicals, pesticides must be familiar with the characteristics of the use of chemical herbicides, pesticides strictly control the use of time, the appropriate concentration and use. When working in machinery, it is also necessary to pay attention to the proper placement of the nozzles and the same pressure, so that the spray is uniform and uniform, and the heavy spray and the leak spray are eliminated. Otherwise, it is easy to cause phytotoxicity. Before spraying chemical sterilizing grass, the medicinal machinery must be thoroughly cleaned thoroughly, especially the medical equipment that has been used in other herbicides before. In order to avoid the occurrence of drug residues in the medical device, it causes phytotoxicity. In addition, nicosulfuron is not suitable for use in high field. If it is the first time to use chemical herbicides, lack of experience, under the guidance of relevant technical personnel, first do a small area of ​​weeding test, sum up experience and then carry out large-scale promotion, so as to avoid irreparable production loss.
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