When we apply the special herbicide for red peony (white peony and peony) after seedlings, the same dose is often the same, and the effect is not the same in different environments, which depends on the sensitivity of the plant to the agent, and the factor that affects the sensitivity the most is temperature.
The temperature will be different in different years, this is what the people say, "this year is colder than last year, this year is hotter than last year", for crops, crops often have years "can't come up", that is, the grain can not reach maturity in this year. In the same season of different years, the temperature is different, and even on the same day, the temperature difference between morning, afternoon and evening can have an effect.
Due to the influence of these factors, the dosage of the dispensing should also be increased or decreased, and the dosage of this year must not be determined by the effect of the previous year. So, how exactly should we do this?
First, as a rule of thumb, determine whether the temperature is on the low or high side of the year, or whether this year's temperature is higher or lower than the previous year. When the growth indicators of weeds and red peony (white peony) meet the standards for herbicide spraying, we will tailor the appropriate dosage formula for them. The application standard is: under the premise of standard dose, the dose is more when the temperature is low, and the dose is less when the temperature is high. Because when the temperature is low, the absorption and transpiration of plants are weak, and the speed of transporting nutrients is slow, and the effective effect of the drug will be small. Conversely, in the case of high temperatures, it is necessary to reduce the dose on the premise of the standard dose.
For example: June 25 of a certain year, according to the growth of weeds should be sprayed, under normal circumstances, the standard dosage is sprayed per mu post-seedling herbicide (four-in-one) 150ml, and this year's temperature is obviously low, the spraying dose can be increased by 25ml, to 175ml per mu. On the contrary, if the temperature is high this year, the dose can be reduced by 25ml to 125ml, and the amount of water can be increased appropriately to reduce transpiration.
The above is the first spraying should be mastered in the year, when the second time the drug is used, with the change of the environment, the medication guidelines will be different.
The second spraying is usually at the end of July and the beginning of August, when it is rainy, and the established spraying plan will often fail, because a day of rain will cause at least three days to be unable to enter the field. If it rains for several days, weeds will grow wildly due to rain, and when the weeds grow to a certain height and intensity, the resistance will be greatly enhanced, and the result will be "unstoppable". Therefore, this season should cherish every day's time and make reasonable use of every hour. On any herbicide or foliar fertilizer instruction manual, you will see sentences along the lines that are not suitable for spraying before 8 a.m., after 10 a.m., and before 4 p.m. and after 8 p.m. The reason is that the dew is large before eight o'clock, and the drug will dilute and reduce the effect of the herbicide, and the temperature is high after ten o'clock, and the evaporation is fast, which affects the effect, and the high temperature is also high before four o'clock in the afternoon, and the dew is also large after eight o'clock. This gives you only two hours in the morning and three or four hours in the afternoon.
We don't have to stick to these rules when it comes to actually taking medicines, otherwise we will miss the opportunity and regret it for a year. In this season, not to mention before eight o'clock, even after nine o'clock, the dew is also very large, and it is not suitable for the spraying rules of the manual. Here, we need to work out the corresponding solutions.
In view of the fact that the dew is large, 5 grams of silicone are added per mu to increase the adhesion of the liquid on the leaves and reduce the loss, so the spraying time in the morning can be much earlier, and the afternoon time can also be extended. Because the wax layer of the red peony leaves has been formed in this season, the absorption capacity of pesticides is greatly weakened, and the high temperature has little impact on it. If the temperature in this season is slightly higher than normal, the dosage will be slightly reduced under the premise of the standard dosage at this time.
In short, it is necessary to achieve the best effect with the most reasonable dosage, and not to waste its red peony to have adverse effects, nor to let weeds run rampant due to insufficient dosage.