In recent years, with the continuous development of agricultural production technology, the application of herbicides in corn fields has become more and more extensive. However, the effectiveness of herbicide use is affected by many factors, one of which is rainfall. So, how many hours does the corn herbicide rain without affecting the efficacy?
First of all, we need to understand the principle of action of the herbicide. A herbicide is a selective agent that kills weeds but is relatively safe for crops such as corn. Herbicides absorb the active ingredients in the agent through the weed leaves, thereby inhibiting the growth of weeds or killing weeds. Once the weed absorbs the agent, its metabolic and physiological functions in the body will be disturbed and destroyed, eventually leading to the death of the weed.
However, the effects of rainfall on herbicides are mainly manifested in the following aspects:
1.Rainfall washes away the chemicals on the leaves, rendering them inoperable.
2.Rainfall can cause chemicals to be lost in the soil, reducing their effectiveness.
3.Rainfall will shorten the residence time of the agent on the weed leaves, which will affect the absorption and conduction of the agent.
So, how many hours does the corn herbicide rain without affecting the efficacy? Generally speaking, it takes a certain amount of time for corn herbicide to form a film on the weed leaves and exert its effect after spraying. Therefore, if it rains for a short time after spraying herbicides, it will wash away the pesticides on the leaves, affecting the efficacy of the herbicide. According to relevant research and practical experience, rain generally occurs within 2-3 hours after spraying herbicides, which will affect the absorption and conduction of herbicides, thereby reducing the weeding effect. However, if it rains more than 6 hours after spraying the herbicide, the agent has formed a relatively stable film on the weed leaves, and the rain has little effect on the efficacy.
In order to ensure the effectiveness of herbicides, the following points need to be noted:
1.Select the appropriate herbicide variety and dosage. Different varieties of herbicides have different modes of action and scope of application, and it is necessary to choose the appropriate variety and dosage according to the specific situation.
2.Spray herbicides in clear weather and avoid spraying in rainy or upcoming rains.
3.Try to avoid watering or rain for 2-3 hours after spraying the herbicide to avoid washing away the agent on the leaves.
4.If it rains for a short time after spraying the herbicide, the herbicide needs to be re-sprayed to ensure effectiveness.
In conclusion, the number of hours of rain on the corn herbicide does not affect the efficacy of the herbicide, depending on the time it takes for the herbicide to form a film on the weed leaves after the herbicide is sprayed. In order to ensure the effectiveness of weeding, it is necessary to spray herbicides in clear weather and pay attention to controlling the spraying time to avoid spraying in rainy days or when it is about to rain. If it rains for a short time after spraying the herbicide, the herbicide needs to be re-sprayed to ensure effectiveness.