Ambush refers to the first day of the dog days, which is also the beginning of the first abstinence. The time of the ambush is not fixed every year, and the traditional calendar says that "the summer solstice is counted on the three Geng", which means that it is counted backwards from the summer solstice, and the third "Geng day" begins to fall in ambush (the "Geng day" here refers to the days with the prefix "Geng" in the ancient "Ganzhi Chronological Law").
Since the date of the ambush is determined by the combination of the 24 solar terms and the day of the Ganzhi period, the date of the summer solstice is not fixed, and the "Geng day" also has certain changes, coupled with the existence of leap months, resulting in the different time of the ambush every year.
This year's summer solstice is on June 21, and the third Geng day will be on July 15, so this year's incubation time will start on July 15. The first time of the year is 10 days, and this year the first time period is from July 15th to July 24th.
"There is rain in the head, and there is rain in the head"
There are many agricultural proverbs about the head and the people, among which the phrase "the head is raining, and the head is raining" is more widely spread. This means that if it rains at the head, there will be rain in the middle and at the end, or there will be more rain.
There are two different interpretations of "head volt" here, one of which is that some people say that it refers to whether it rains on the day of ambush; Second, it means that if there is rain during the entire ten days of the first ten days, it is considered rain. As far as the author knows, most of them are in favor of the former, that is, if it rains on the day of the ambush, it indicates that there will be more rain throughout the dog days.
Summer is a hot and rainy climate, especially after the dog days, when the temperature is high and the air pressure is low, while the ocean air flow is just the opposite, the temperature is low and the air pressure is high. When the wind of the ocean air flow blows to the mainland, the hot and cold air meet, and it is easy to form rainfall.
If rain occurs during the dog days, it may indicate that the winds blowing towards the continent are more active, which increases the chance of mid-volt and last-day rainfall.
How good is it to rain during dog days?
From the perspective of people's senses and daily life, most friends do not like dog days for a long time, and if it does not rain all the time, the weather is hot and dry, and daily life will be uncomfortable. And for people who work outdoors, it also increases the risk of heat stroke.
Therefore, from this point of view alone, the rain during the dog days is appropriately increased, which is more popular with everyone.
From an agricultural point of view, there are pros and cons to excessive rainfall during dog days, depending on the amount of rainfall.
During the dog days, it is the grain filling period for the growth of summer crops, such as corn in the tasseling, flowering, and grain filling period, under the moisture of too drought, the corn plant can not absorb enough water, which will affect the growth of a series of growth periods, resulting in less effective corn cob formation, and the subsequent grain filling grains are not full, and the 1000-grain weight decreases, resulting in reduced yield.
With suitable rainfall, the soil moisture is better, and the corn plants absorb sufficient water, which is conducive to a series of growth and promotes high corn yield.
However, it is important to note that if there is too much rain during the dog days, there is continuous rainy weather, resulting in waterlogging, it is considered to be too much moisture. When the corn plant is soaked in water for a long time, the root system cannot breathe properly, and after a long time, rotten roots will form and can no longer transport water and nutrients.
If the stagnant water can recede, it will cause a reduction in yield, and if the stagnant water does not go down for several days, it may cause a bad harvest. Therefore, from the perspective of agricultural production, there are pros and cons to excessive rainfall on dog days, depending on the amount of rainfall.
"Bow your head, bask your tail"
In many areas, there is also a saying that "drenching the head, drying the tail", literally, if it is rainy weather when entering the ambush (or head), then the rain on dog days may be mainly concentrated in the head and middle, and when it comes to the end, the rainfall will decrease, and there may even be a drought.
From the point of view of agricultural production, this kind of weather is bound to be unfavorable to the normal growth of crops, when the drought is long-term, the crops grow weakly, the plant's own resistance will also be reduced, and it is easy to suffer from pests and diseases. If you go to water, it is relatively hot during the dog days, and the corn plants are already growing, so it is not suitable to go to the field for watering.
Seeing this, many friends will find a problem, the agricultural proverb "the head is raining, the rain is lying down" and "the head is drenched, the tail is sunned", the meaning is different, so is it wrong?
The reason may lie in the different regions where the agricultural proverbs are circulated, such as the difference between the south and the north, and when the ancients summed up their experience, there would be agricultural proverbs with completely opposite meanings.
On July 15th, it was ambushed, and it was rumored on our side that "there is rain in the head, and there is rain in the head", ask everyone, where are you?