Weeding in Summer Sesame Field
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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High-quality and high-yield cultivation techniques of summer sesame
With the adjustment of planting structure, the planting area of summer sesame in our province is expanding continuously. In recent years, through practice, we have summed up a set of high-quality and high-yield cultivation techniques of summer sesame, which are introduced to you in order to improve the yield and quality of summer sesame in our province. The main results are as follows: 1. crop rotation and crop rotation is the premise of realizing high quality and high yield of summer sesame seeds. Second, the sesame varieties such as Yuzhi 8, Yuzhi 11 and Yuzhi 9 with high quality and high yield and strong stress resistance should be selected for the production of summer sesame. Third, the appropriate date is early.
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Fertilization techniques of summer sesame
In order to get a higher yield of summer sesame, it is necessary to apply nitrogen, phosphorus and potassium fertilizer skillfully. When fertilizing, we should pay attention to grasp the principles of stability, accuracy and ruthlessness. As soon as it is stable, that is, fertilization at the seedling stage should be stable. The growth of summer sesame seedlings is slow, and the ability of roots to absorb nutrients is weak. If the basal fertilizer is insufficient, the seedlings will be thin, so we should apply the fertilizer as soon as possible, but the amount of fertilizer should be small, otherwise it is easy to cause tall seedlings. The second criterion, that is, topdressing in the bud stage should be accurate. The growth rate of summer sesame is obviously accelerated from budding to the early flowering stage. at this time, topdressing can promote flower bud differentiation and improve.
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