What are the key technical points for sorghum seedling stage management?
How to manage sorghum seedlings well? Please give guidance. Sorghum seedling stage management can be carried out by referring to the following methods: 1. Chemical weeding: Chemical weeding should be carried out 3 days after sowing, using 3-3.5 kg of atrazine per hectare mixed with 400-500 kg of water for spraying. If the weather is dry, spray clean water once within two days after spraying the herbicide, wetting the ground to a finger's depth to improve the weed-killing effect.
How to manage sorghum seedlings well? Please give guidance
Sorghum seedling stage management can be carried out by referring to the following methods:
1. Chemical weeding: Chemical weeding should be carried out 3 days after sowing, using 3-3.5 kg of atrazine per hectare mixed with 400-500 kg of water for spraying. If the weather is dry, spray clean water once within two days after spraying the herbicide, wetting the ground to a finger's depth to improve the weed-killing effect.
Spray 72% 2,4-D butyl ester herbicide. First conduct a small-area test, then apply it on a large scale. When seedlings are 3 cm tall, spray 0.75 kg of 2,4-D butyl ester per hectare, but it can only be used in areas with heavy broadleaf weed infestation; grass weeds must be removed manually.
2. Prevention and control of seedling stage diseases: Sorghum rarely suffers from seedling stage diseases, but in special years white spot disease may occur. Once discovered, use 0.075 kg of zinc sulfate and 0.05 kg of urea per mu mixed with 15 kg of water for treatment.
3. Timely thinning, hoeing and ridging, and timely topdressing: For chemically weeded plots, thin seedlings when young plants have 4 true leaves. For manual weeding, thin seedlings when young plants have 3 true leaves combined with hoeing. When thinning seedlings, pay attention to pests and immediately use methamidophos to kill insects if found. After seedlings emerge completely, use a small plow for deep ridging once, the deeper the better. After thinning, use a medium plow for ridging once. Must do two hoeings and three ridgings or two hoeings and four ridgings, and apply topdressing once combined with closing the wide ridges, applying 200 kg of diammonium phosphate per hectare.
4. Prevention and control of aphids: Eliminating aphids must focus on prevention. The method is to spray phoxim once at the end of June, using the phoxim bottle cap as a measuring cup, adding 0.05 kg of diammonium phosphate and 0.05 kg of Xiaoyedi to every 4 caps of the pesticide mixed with 15 kg of water, using 30 kg of water per mu. In mid-July, use dimethoate emulsifiable concentrate for prevention once, using the dimethoate bottle cap as a measuring cup, adding 0.075 kg of diammonium phosphate and 0.05 kg of Tainong Gaochangbao to 4 caps of dimethoate mixed with 15 kg of water, using 30 kg of water per mu. In late July, carry out another treatment, adding 0.05 kg of double-effect microelement fertilizer and 0.05 kg of urea to 4 caps of dimethoate mixed with 15 kg of water, using 30 kg of water per mu. Prevention should be done early rather than late. After entering August, spraying must pay attention to safety to prevent poisoning and heatstroke.
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