Soil sealing treatment is the first and most important part of chemical weeding in wheat fields, which can significantly reduce the weed base in winter wheat fields and greatly reduce the cost of medicine.
For late sowing wheat, the soil closure before sowing is more important. If you wait until the emergence of the vaccine, the probability of a large temperature drop is very large, and the temperature range suitable for weeding stems and leaves is narrow, so it is easy to miss the best medication period, such as the use of isoproterenol and other drugs, the occurrence of "freezing damage" The chances are even greater.
The wheat field is closed to the soil, and some areas are used to medication immediately after sowing. Many years of practice have shown that it is better to delay the time of medication and to use the medicine before the needle is established. This is because the soil aggregate structure is unstable and easily broken in the short term after sowing. After using the soil sealing treatment agent, a strict soil layer cannot be formed, which will affect the sealing effect.
It is generally recommended to use the medicine just after the wheat has been germinated and not yet unearthed. On the one hand, the soil has been solidified at this time, which is conducive to the formation of a stable soil layer; on the other hand, grass weeds have sprouted and roots, which is beneficial to absorb the drugs in the soil, improve the herbicidal effect, and play a role in joint sealing. At the same time, it can also remove some of the broadleaf weeds that emerged before winter. It is recommended to check the germination process of wheat in time to determine the timing of medication more reasonably. It is necessary to pay attention to the use of drugs that are safe for the growth of wheat shoots, and to avoid the use of acetochlor-containing agents to prevent burning buds when water is accumulated.
On the basis of selecting the medicinal agent, the use of sufficient water is beneficial to the formation of a more strict drug layer in the soil, thereby improving the effect of closed weeding and not reducing the amount of water at will. Generally, the water consumption per mu is about 50 kg.
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