Ye Jie, distributor of agricultural products in Yeji District, Lu'an City, Anhui Province, through a text message (135**** 9835) July 13: Hello! Will the weeds in the field of sorghum be better? Liu Zhengjia: The weeds in the fields of Sorghum can be controlled in stages. (A) Soil treatment before seedling after sowing Chemical weeding after sowing until preemergence is a method of weeding by time difference selection method. After weeding the seed of sorghum and spraying the herbicide before seedling emergence, the weeds germinate early and will quickly die after being treated to achieve the purpose of weeding. . The pre-emergence pre-emergence chemical weed control methods commonly used in sorghum are: (1) 35% atrazine suspension 150-200 ml/mu, soil spray. (2) 960 g/l of metolachlor EC 50-80 ml/mu or 960 g/l metolachlor EC 65 ml+38% atrazine 100-150 ml, effective in controlling annual Grass and broadleaf weeds. Symptoms affect the effects of weeding, poor lysing and poor weed control, should be applied after rainfall or irrigation. In poorly drained or sandy soil blocks, the use of metolachlor is prone to injury. (II) Stem and leaf treatment at seedling stage Chemical weeding at seedling stage is the use of herbicides in the metabolism of crops and weeds in different biochemical processes to achieve the purpose of herbicides. Sorghum 5-8 leaf stage after emergence, strong resistance, the use of chemical herbicides safer, and before the 5 leaves, 8 leaves after the herbicide is very sensitive, so the chemical weeding in the seedling stage is generally carried out in the 5-8 leaf stage, otherwise It is prone to injury. Sorghum chemical weeding is mostly done before sowing seedlings, generally not suitable for spraying herbicides at seedling stage. If severe grass-roots damage occurs at the seedling stage, the spraying time, concentration, and species should be strictly controlled, and chemical control should be selected during the 2-4 leaf stage of weeds. The commonly used methods of chemical weeding at the seedling stage include: (1) 54% 2,4-D butyl ester EC, 40-65 ml/mu, watered 35 kg or so, uniformly spraying weed stems and leaves, mainly controlling broad-leaved weeds and Cyperaceae weeds, for grasses Weeds are invalid. Pay attention to the wind speed and direction when spraying, and avoid the liquid drifting to the sensitive broad-leaved crop field. Sprayer nozzles are best to wear protective covers. (2) 35% Atrazine Suspension, 200-250 ml/mu, watered 35 kg, uniformly spraying weed stems and leaves. It can control single and dicotyledonous weeds as well as deep-rooted weeds. (3) 56% dimethyl tetrachlorine WP 100 g/mu, watered 35 kg, uniformly spray weed stems and leaves. Pay attention to wind speed and wind direction during application, avoid drifting and other miscellaneous herbs, and pay attention to the thorough cleaning of the drug device. (4) 48% antiseptic pine water agent 150-200g/mu, watered 35kg, uniformly spraying weed stems and leaves. (5) 20% chlorofluoropyr- nosole EC 20 ml/mu, watered 35 kg, uniformly spray weed stems and leaves. There is currently no ideal pharmaceutical agent for the control of grass weeds in sorghum field. Currently, the use of quinclorac against valerian is known. However, the efficacy of valerian is not uniform, and it can be used after being tested according to the situation. Special emphasis should be placed on the fact that stilts are sensitive to chemical agents and must be used with strict knowledge of the type, timing, concentration, and method of use of the drug, otherwise it is likely to cause phytotoxicity. If you are using chemical herbicides for the first time and you lack experience, you must first do a small-scale weeding test and summarize the experience before you promote, so as not to cause irreparable loss of production. Breathing Filter- Heat & Moisture exchange filter(HMEF)
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