The temperature has dropped by nearly 15 degrees in many places, and the "cold spring" is coming? Is wheat fertilization and pesticide application affected?

a new round of rain and snow weather is coming, especially in the rainy area, which is not in a certain province, but in many parts of the country.

At the same time, the temperature drops to 12-15 degrees in some areas, forming seasonal cooling or turning cold air.

many places in China have entered the spring, and this time, the rain has cooled down. Many friends will ask, is this big cooling down a "cold spring"? For growers, can wheat be fertilized and sprayed in the near future? After reading this article, you will have the answer.

according to the weather forecast issued by the central meteorological observatory, there will be a large-scale precipitation and cooling process in the central and eastern regions of China from 16th to 17th.

there are moderate to heavy rains in the eastern part of southwest China, Huanghuai, Jianghan, Jianghuai and Jiangnan, among which there are heavy rains in parts of northern Guizhou, northern Hunan, central and eastern Hubei, central and southern Anhui and central and southern Jiangsu, and local heavy rains.

Snowfall areas are mainly concentrated in the northern region. From 16th to 18th, there were small to medium snow or sleet in the central and western Inner Mongolia, Beijing-Tianjin-Hebei, most of Shanxi, Liaoning, eastern and northern Shandong, and heavy snow and local snowstorms occurred in parts of central Inner Mongolia, northern Hebei, northern Beijing and northwestern Shanxi.

the cooling area is obvious in the central and eastern regions, mainly affected by rain and snow, with a large cooling range of about 4-1 degrees in most areas, among which the cooling in southern Hebei, central and western Henan, western and northern Shandong can reach more than 12 degrees, and the local temperature can reach 14-16 degrees.

Take the eastern part of Henan where the author is located as an example. From March 1 to 15, the lowest temperature was above 1 degrees, and the highest temperature reached about 25 degrees. However, it began to rain on the 16th, and the lowest temperature dropped below 1 degrees and the highest temperature dropped below 2 degrees.

on 17th, the temperature dropped further, the lowest temperature was only 3-4 degrees, and the highest temperature was less than 1 degrees, between 8-9 degrees.

on the 2th, the cooling continued, with the lowest temperature dropping to degrees and the highest temperature only 6-7 degrees.

in just a few days, the weather has dropped from about 25 degrees to 6-7 degrees, giving people a feeling of entering winter from spring.

In a normal year, after entering the second half of March, the temperature continues to rise, which is the season of spring blossoms. Is this cooling this year a "cold spring"?

Late spring cold refers to the weather phenomenon in which the temperature rises rapidly in the early stage and it is cold in the later stage during March-May. Simply speaking, it is warm in the early stage and cold in the later stage, and the cold temperature in the later stage is even greater, which can make people feel the cold weather obviously compared with normal years in previous years.

According to the answer from China Weather Network, during the first ten days of March this year, the temperature in most parts of China rose rapidly, and it was basically warmer from the central part of Shandong to the south.

The cooling since 16th has made North China, Huanghuai and the areas along the Yangtze River feel the cold weather again.

Therefore, this cooling can also be said to be a "cold spring" process.

the "cold spring" is coming! Can wheat still be fertilized and sprayed with drugs?

in March, it is the peak period of wheat turning green. During the period of wheat turning green, it is necessary to topdressing green fertilizer and spraying "one spray and three prevention" chemicals. But this "cold spring" strikes, can fertilization and pesticide application still be carried out?

according to the actual situation of wheat, the topdressing of wheat in Henan, Anhui, Jiangsu, Hubei and other wheat-growing areas has been completed, and in some areas such as Hebei and Shandong, the topdressing of wheat has also been completed. It may be that in a small number of planting areas in northern Hebei and northern Shandong, the topdressing of wheat has not yet started.

for the wheat that has been topdressing, it is not necessary to consider whether topdressing can be done this time. For the areas that have not been topdressing, urea or compound fertilizer can be applied in furrow in advance while the local rainfall is still coming. After topdressing, the utilization rate of fertilizer can be improved in rainy days.

topdressing can also be done after the rain cools down, but topdressing is better than topdressing before the rain.

However, for the first time, many farmers in Anhui, Henan, Hebei, Shandong and other areas have not started spraying the "one spray and three prevention" chemicals. In case of this cooling and rainy weather, it is suggested to postpone the use.

especially before the rainy weather is coming, you can't spray chemicals any more.

on the one hand, if it rains after spraying, the rain will wash away the liquid medicine, reducing the effect of pest control and disease prevention.

on the other hand, it wastes labor, and it needs to be sprayed again after the rain, which increases the planting cost.

therefore, the "late spring cold" weather, which is cooled by the rain, has little effect on wheat planting (the top dressing has basically been completed), and the pesticide application has been greatly affected.

it is suggested that farmers wait until the rain cools down before spraying the "one spray and three defenses" medicine.

to sum up, the cooling and rainy weather that started on March 16th, according to industry analysis, belongs to the category of "cold in late spring", and everyone needs to do a good job of keeping warm, which is expected to last until the 22nd.

For wheat growers, it is very important to adjust measures to local conditions, so it is suggested to wait until the cooling and rainy weather before spraying the "one spray and three defenses" medicine.