Late sowing of wheat should pay attention to closed weeding
Soil sealing treatment is the first and the most important aspect of chemical weed control in wheat fields, and can significantly reduce the number of weed bases in winter wheat fields. The weeds that germinate after the beginning of spring are much younger than wheat seedlings, and are easily filled with stem and leaf treatment agents. In addition, medication costs and labor costs can be greatly reduced. In the process of soil treatment, the contact between the medicament and the wheat seedlings is reduced, and the possibility of the occurrence of the phytotoxicity is also reduced. In recent years, in the context of the treatment of herbicide resistance by some weeds on some stems and leaves, the effect of sealing treatment is even more important. At present, the production mainly uses isoproturon and its compounding agent for soil sealing treatment, and the drug also has both stem and leaf weeding effects.
For late sowing, it is more important to remove the soil before planting. Because the temperature of seeded wheat sowing is generally low, the time for emergence of wheat is elongated. If the drug is used after emergence, the chance of a significant decrease in temperature is very high. The temperature range suitable for weeding in stems and leaves is narrow and it is easy to miss the most. During the period of good drug use, if drugs such as isoproterenol are used, the risk of “frozen phytotoxicity†is even greater.
Closed soil treatment of wheat fields, many growers are used to medication immediately after sowing. Many years of production practice have shown that the appropriate time for drug use is delayed, and the use of drugs before the needles in wheat is the best for closed weed control. This is because short-term after sowing wheat soil pellet structure is unstable, easily broken, the use of soil to close the treatment agent can not form a tight layer of medicine, will affect the sealing effect. It is generally advisable to use the medicine immediately after germination when wheat is sown. On the one hand, the soil is already solid, which is conducive to the formation of a stable layer of medicinal soil. On the other hand, grasses and weeds have emerged buds and roots, which are beneficial to the absorption of drugs in the soil and improve the weeding effect. At the same time can also take part in broadleaf weeds that emerged before winter. The emergence time of wheat is greatly affected by factors such as temperature and moisture. It is recommended to check the germination process of wheat in a timely manner in order to more reasonably determine the time of application. It is necessary to remind that at this time pay attention to dredge the ditch of wheat fields to prevent continuous rain water; use drugs that protect the growth of wheat sprouts, avoid the use of acetochlor-containing drugs, and prevent burning of water when water accumulates.
Based on the selection of pharmaceuticals, the use of a sufficient amount of water is conducive to the formation of a more dense drug soil layer in the soil, thereby improving the effect of sealing and weeding. Even if the soil moisture in the field is appropriate, the water consumption cannot be arbitrarily reduced. General requirements for water consumption per mu is about 50 kg, coarse spray. If large spray machinery is used for spraying, the amount of water used needs to be increased.
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