When does the late spring cold usually occur? Can wheat be watered after the Rain Water solar term?

Rainwater is the solar term after the beginning of spring. Although the climate is getting warmer at this time, it is still relatively cold in the morning and evening. We still need to be careful of late spring cold. However, some crops can also be planted. For example, wheat planted in winter. So when does late spring cold usually occur? Can wheat be watered after Rainwater?

When does the late spring cold usually occur?

Late spring cold refers to the period just after the beginning of spring when the cold between heaven and earth has not completely subsided and the temperature difference between morning and evening is large. At this time, you should add or remove clothes in time according to the temperature to avoid the invasion of cold air. Especially some elderly people with hypertension, diabetes, respiratory diseases, cerebrovascular diseases, and gastrointestinal diseases need to be extra vigilant. Keep a happy mood, walk outdoors more, ventilate the room more, and close windows and doors at night.

In terms of diet, after the Spring Festival, people usually eat a lot of fish and meat, but now they mainly eat light food. The Five Internal Organs and Five Elements say that spring is the season for growth, so eat more dark green and red and yellow vegetables to nourish the liver and spleen, such as broccoli, carrots, and pumpkin. As the temperature rises, bacteria and viruses become active, leading to the activation of various diseases. At this time, you should eat more vegetables and fruits rich in vitamins and minerals, such as citrus and lemons.

Can I water wheat after the Rain Water solar term?

1. The spring climate is windy and rainy. Watering too early in the spring can easily cause a large drop in temperature in the field, which is not conducive to the growth of wheat after it turns green, and can also cause frost damage due to the arrival of cold air. Fertilizer and watering after the wheat turns green can also cause too many ineffective tillers in the spring, resulting in a waste of nutrients and laying hidden dangers for pests and diseases in the later stage.

2. The time for watering should be determined according to the conditions of the wheat fields. If no freezing water is applied before sowing in winter, the wheat fields suffering from severe drought should be watered in time for greening. Watering can only be carried out when the daily average temperature reaches above 3°C. It is better to water the fields in small amounts rather than flooding with large amounts of water.

3. The second watering of winter wheat in spring should be done in late April or early May. For wheat fields with poor growth or good growth before winter but weak growth in spring, apply urea at a rate of 10 kg per mu.

In short, only reasonable watering and fertilization can ensure a good yield and harvest of wheat.

How did the 24 solar terms come about?

There are 24 solar terms in total: Beginning of Spring, Rain Water, Waking of Insects, Vernal Equinox, Pure Brightness, Grain Rain, Beginning of Summer, Grain Full, Grain in Ear, Summer Solstice, Lesser Heat, Greater Heat, Beginning of Autumn, End of Heat, White Dew, Autumnal Equinox, Cold Dew, Frost Descent, Beginning of Winter, Light Snow, Heavy Snow, Winter Solstice, Lesser Cold, Greater Cold.

This is based on the solar calendar, which is determined by the length of the shadow of the sundial in a year, as follows:

1. A year is divided into spring and autumn. In the earliest times, a year was divided into only spring and autumn. The winter solstice and summer solstice were determined by the longest and shortest points of the sun's projection on the gnomon. In the past, the winter solstice was the end of the year in the solar calendar.

2. The spring and autumn are divided into four seasons. The middle point of spring and autumn is divided into four seasons: spring, summer, autumn and winter.

3. Four seasons are divided into eight festivals. The midpoints of the four seasons are the beginning of spring, the beginning of summer, the beginning of autumn, and the beginning of winter, and the year is divided into eight festivals.

4. The eight solar terms are divided into 24 Qi, and each solar term is divided into three Qi, for a total of 24 Qi in a year, which are called solar terms.

5. There are 360 ​​days in a year, and every 5 days makes up a season. This is how the concept of climate came about.

Regarding the solar calendar, you can refer to "Xia Xiaozheng", which is said to be a phenological and agricultural calendar left over from the Xia Dynasty. The text is extremely simple and ancient.

Who invented the 24 solar terms? Chinese people do not believe in myths. The working people observed nature in social practice and summarized it. If we must give an inventor, it must be Fuxi.