Seeing that the weather is cold during the winter, and often accompanied by strong winds, it is not conducive to the exertion of efficacy. Therefore, it should be taken during sunny days when the temperature is relatively high.
After scientific drugs enter the winter, the growth of crops and weeds is relatively slow, but relatively speaking, the growth rate and growth of weeds are faster than the crops. Therefore, it is necessary to implement chemical weeding on winter crops. However, when the herbicides are used at low temperatures in winter, the effect is often less pronounced than in the season when the summer and autumn temperatures are high. Sometimes, the effects are not seen in the short term. The main reason is that due to the low temperature conditions, the herbicides are used on the one hand. Efficient release is poorer. On the other hand, weeds are absorbed by weeds. At the same time, they are slowly absorbed and decomposed by weeds, resulting in reduced or even complete failure. Therefore, the use of herbicides at low temperatures, in addition to the choice of herbicides on the road, the technical should also grasp the following points.
At this time, the physiological metabolism of weeds is relatively strong, which is conducive to the conduction of pesticides in the weeds. The metabolic decomposition is difficult and it is easy to receive better weeding effects. If it enters in December, the wheat field will be controlled by the thrips and it will be very difficult to kill the weeds. In particular, herbicides such as isoproturon cannot be used when the temperature is too low, and should be postponed to the end of February or early March of the following year. When the temperature rises, appropriate herbicides are selected based on the growth of weeds in the field.
The herbicide should be applied with thorough and even application of the herbicide during the high temperature period in winter. Some of the weeds are deadly because of their growth, but the low-temperature herbicide has no such efficacy and cannot rely on the pesticide to kill the weeds. Therefore, the application of water should be strictly according to the dilution of water, not arbitrarily reduce the amount of water. When spraying, attention should be paid to thoroughness, uniformity, no heavy spraying, no leakage of spray, and weeds should be sprayed on all weeds.
There must be some patience to use herbicides during the winter and low temperature seasons, and it began to show that the time of efficacy was significantly later than the time when the herbicides were used during the high temperature season. For example, rapeseed fields and vegetable fields can be covered with grass to prevent early maturation. In general, it takes 12-15 days for the farmland to experience grass weeding. In the summer, high temperature stages control the farmland of Setaria, usually over 5-7 days. All will die. Therefore, be patient and wait patiently. As long as the timing is well controlled, the liquid sprays into place, and it is generally not necessary to re-administer the drug.
Choose from a variety of ways to use some herbicide mixed with soil made of toxic soil, or mixed with fertilizer made of toxic fertilizer, in the winter when the use of low temperature is safe, the efficacy is relatively stable. When using oats, 500 grams of oat enemies can be mixed with 50 kilograms of fine soil (sand) or 7.5 kilograms of urea or 1.5 kilograms of superphosphate. When mixed, a small amount of water should be sprayed to make the medicine and soil or fertilizer fully bonded. Immediately after the application, the herbs or fertilizers are mixed with the soil to improve the weeding effect.
Adding nitrogen fertilizer to improve weeding
The use of 2,4-D sodium salt in the wheat field when mixed with ammonium nitrate, ammonium sulfate, and urea can significantly increase the herbicidal effect of the 2,4-D sodium salt. Since the chemical fertilizer is added, the surface tension and pH of the solution are reduced, the adhesion of the agent is increased, and the herbicidal performance of the herbicide is improved.
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