MySheen

Weeding in Summer Sesame Field

Published: 2024-11-22 Author: mysheen
Last Updated: 2024/11/22, Summer sesame seedling stage is in high temperature and rainy season, the root system is few, the growth is weak, and the weeds emerge quickly, the density is large, the growth is vigorous, and the sesame seedlings are easy to cover and form grass shortage, so the corresponding herbicides should be selected at different stages for elimination. 1. Soil sealing treatment after sowing and before seedling emergence. After sesame seeds are sown, spray 50% acetochlor EC 100ml or Dur (72% metolachlor EC) 200ml with 50kg water evenly on each mu to control many kinds of annual grass weeds such as Setaria, Digitaria, Alopecurus chinensis and Eleusine grass, etc.

The summer sesame seedling stage coincides with the high temperature and rainy season, the root system is few, the growth is weak, but the weeds are unearthed quickly, the density is high, and the growth is prosperous, which is easy to shield the sesame seedlings to form grass famine, so the corresponding herbicides should be selected in different periods.

1. Soil closure treatment before seedling after sowing. After sowing sesame seeds are sprayed evenly with 50% Acetochlor EC 100 ml or Dur (72% Metolachlor EC) 200 ml plus 50 kg water per mu, which can control many kinds of annual grass weeds, such as Setaria mandshurica, Magnolia mandshurica, sesame grass, and so on. It also has a certain control effect on a variety of broad-leaf weeds propagated by small seeds. Keep the soil moist after the medicine, and it is not suitable to plough and loosen the soil within 50 days, so as not to destroy the soil layer.

Second, skillfully use sterilized herbicides. Weeds in Xia Zhi sesame field generally emerge 3-10 days earlier than sesame, and grow rapidly. You can make full use of the period before sesame emergence, use paraquat to control unearthed weeds, using 20% paraquat water agent 200 ml per mu plus 40 kg of water spray. The herbicide is a contact-killing herbicide, which can be quickly absorbed by plant leaves, so that photosynthesis and chlorophyll synthesis are quickly terminated. The leaves begin to change color 2-3 hours after administration, but can not be transmitted, so only part of the drug can be damaged. Drug contact with soil, passivation failure, no residue, no effect on sesame seedling emergence.

Third, use selective herbicides after seedlings. After sesame emergence, weeds in the 2-3 leaf stage can be sprayed with 70-100 ml of fine grass (5% quizalofop EC) per mu or 50 ml (15% PYF EC) plus 40 kg of water per mu. The weeds appeared the symptoms of heart leaf withering and browning in 4-5 days, and the whole plant died 7-8 days later. The weeds mainly controlled the annual weeds such as wild oat, horse tang, sage grass, Euphorbia angustifolia and Euphorbia paniculata.

 
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